Fieldinfo getvalue null. In C#, GetValue, GetConstantValue, and GetRawConstantValue are three methods of the System. GetValue extracted from open source projects. With reflection, we usually have a significant performance loss—it is worthwhile to avoid using reflection in places where performance matters. NonPublic; Type type = obj. This is exactly how Reflection in C# works, and while you may not realize it at this point, being able to examine and change information about your application during runtime, offers huge potential. I don’t understand what the variable is actually referencing … Mar 14, 2012 · Apparently, PropertyInfo. // We'll set a dummy value for UnityEngine. Aug 30, 2016 · @JerrySwitalski split the line itemPhase = fi. cs source code in C# . Nested types are not returned. targetObject); } public static void Nov 1, 2002 · FieldInfo provides access to the metadata for a field within a class and provides dynamic set and get functionality for the field. GetValue(null); object[] parameters = new object[] { recycledEditor, position, dragHotZone, controlID, value, "g7", style, true }; return (float)doFloatFieldMethod. Enemies Anywhere makes every room fair game for first spawns. private void OnEnable() { slider. You can rate examples to help us improve the quality of examples. targetObject); } public static void SetValue (this SerializedProperty property Dec 26, 2017 · I think it makes sense that PropertyInfo. Exception: This method throws ArgumentNullException if the name is null . GetValue(this), "new name", null) This then applies it to the value of the _person field instead. I know MSDN says you can access them if the code is fully trusted, but what that means? I added at the end some code I used. PropertyInfo. Unfortunately when AssetReference is used as dictionary key or as a part of structure or class that is a dictionary itself, the drawer causes to fail: the field simply doesn’t render in inspector, but I still can access it via right mouse button click. GetValue(stat,null)); the GetValue always output 0 right after the SetValue when changed, which is weird… The code successfully goes through the Property Value however, as seen in the debugger. GetValue(dictionary. But I cannot find any way to get the property value of these fields. GetValue(this) as IItemPhase; into two - the first that calls GetValue, the second to do the cast and then check the type of the object that GetValue actually returns. These are the top rated real world C# (CSharp) examples of FieldInfo. > > First of all, I can't access private fields. Name. Oct 19, 2012 · I am new to using reflection in C#. Log (ff + " AND " +(float)propertyInfo. GetField (name, flags); return (T)field Nov 16, 2020 · I'm trying to make a system that using reflection and during compilation time, it's able to generate a configuration file for some classes. _FieldBuilder Jan 14, 2016 · private static List GetSupportedLanguages () { var fieldInfo = typeof (ScriptCompilers). Object types, or will call the method again after a delay for other types, Aug 29, 2020 · I'm using Unity and i have a class full of gameObjects, i want to take an instance of that class and compare all the values against one i already have. GetValue(captureConst. Serializable] public class PresetHolder : ScriptableObject { public List<ItemRandom> randomPresets = new List<ItemRandom> (); public void AddRandomPreset Null Summary. Name, BindingFlags. GetValue(s); all you can do, because field doesn't have the setter\getter method as it is in a property. Value) as string; Sep 3, 2013 · It would appear that the type of one of the values returned by fi. 0. GetProperties (); …GetValue有两个参数一个返回值，参数一就是要获取属性值的对象，PropertyInfo只是表示属性 元数据，跟对象无关，因此你要获取谁的属性得指定 参数二是指定索引值的，PropertyInfo不光是针对属性还有索引器，二者都是用PropertyInfo描述的，因此 If the field is found (i. Then, if the field is static everything works fine But you need to handle case when value is null, so in this case you can assign it to property only if property type is nullable or property type is reference type: . GetValue(obj); case MethodInfo methodInfo Given this class class Foo { // Want to find _bar with reflection [SomeAttribute] private string _bar; public string BigBar { get { return this. GetField (property. method. GetField : string -> System. Value); object price = ((PropertyInfo)productToPrice. FieldInfo fi = parentType. GetValue ()?，程序员大本营，技术文章内容聚合第一站。 FieldInfo myf = typeof (MyClass). Of course, MyClass2 and its descendants must have a parameterless constructor now. To access a non-public field, set the BindingFlags to NonPublic in the GetField method and set the accessibility to Instance or Static. Compile()?I'm having issues trying to get the value of an object out Reflection introduction Wikipedia says that "In computer science, reflection is the process by which a computer program can observe and modify its own structure and behaviour". Similarly, you can quite easily retrieve the value of a const or static field for a type, simply replace BindingFlags. Reflection, which is Get the Type of the class using the GetType () method on the instance. GetValue ()返回null 问 对于嵌套的静态类公共静态字段，FieldInfo. GetValue (null); return languages; } It looks like the unity API has changed a bit, probably in anticipation of their removal of UnityScript. Open the scene "asd" 3. If I call “GetParameterValue” and “SetParameterValue”, I would expect to manipulate the Processor on the action itself, but instead it calls them on the binding. SetValue(((FieldInfo)member). GetValue (a) as the input for PropertyInfo. It just seems like I should be able to loop through the members instead of looking up the members for each value. By voting up you can indicate which examples are most useful and appropriate. NonPublic)); Sep 11, 2013 · This doesn’t work for some reason. MyEvent += MyFancyEventListener; var xyz = Business. Fields We loop through Sep 10, 2016 · I have implemented the code for reading the active sessions using the reference Reading All Users Session and Get a list of all active sessions in ASP. GetValue(product, null); price is now 30. GetValue(null) for this as suggested in this post, but it did not work giving me the error: TargetException: Non-static field requires a target. public string ReturnProperty(object ob, string prop) { Type type = ob. null: If you don't have an object to get the value from, you can use null as the second parameter. As what I know currently most of them only support fields with an instance. objectReferenceValue as GameObject; As vexe & codingChris point out, you can use PropertyDrawer. GetType (). Answer: When working with enums in C#, you may occasionally need to access their underlying values dynamically using reflection. 2w次，点赞3次，收藏6次。本文介绍了一个使用C#编写的通用方法，用于遍历并打印对象及其集合属性的详细信息。通过反射获取对象的所有属性，包括嵌套的学生列表，并展示了如何访问和打印这些属性的值。 Feb 22, 2012 · I want to get value for a dynamic property of a dynamic object. Note that the value of the obj argument is null. targetObject) as GameObject; ObjectB ob Dec 19, 2014 · System. SetValue quite a lot in my programm, which is significantly slowing up my programm. GetValue(type)` shows invalid cast exception, and i can't cast because the target type has a generic type to get the value of a static field, type fieldtype result = (fieldtype) fi. GetParameterValue Jan 4, 2011 · null本身实际上是基本类型，但是Javascript在存储的时候，会将不同的对象在底层存储都使用二进制的方式存储，在Javascript中如果二进制的前三位都为0的话就会被判断为object，null的二进制存储表示形式为全是0，自然前三位也是0，因此执行typeof时会返回”object”。 类 FieldInfo 没有公共构造函数。 FieldInfo 对象是通过调用 GetFields 对象的 或 GetField 方法获取的 Type 。 字段是在 类中定义的变量。 FieldInfo 提供对类中字段元数据的访问，并为字段提供动态集和获取功能。 在调用 或对 对象调用 get 之前，类不会加载到内存中。 Jun 30, 2013 · C#: How to set or get value of a private or internal field through the Reflection June 30th, 2013 Admin Leave a comment Go to comments Dec 28, 2021 · @BenVoigt field can refer to both static and non-static variables. GetValue。 它将字段的值作为对象返回。 May 27, 2014 · The FieldInfo documentation I was able to find did not compare and contrast these two methods. SetValue(null, newInt);, and I read the MSDN about the FieldInfo. GetValue(targetObject); // If the current value object is null, the owner instance may not have been initialized. However, sometimes this is required. IgnoreCase Dim fI As System. Invoke passing in the instance of class_b. FlattenHierarchy); Obj is an object passed from the calling class, since i dont know what class that is calling the function i used an Get the Type of the class using the GetType () method on the instance. public class Foo { public String d1; Mar 8, 2024 · I would like to mod a game that uses i2 localization. You can do something like: switch (memberInfo) { case FieldInfo fieldInfo: return fieldInfo. SetValue(null, value); var value = Type. I've tried getting its value as one comment suggeste Feb 23, 2011 · Reflection get type of FieldInfo object? Asked 14 years, 5 months ago Modified 14 years, 5 months ago Viewed 19k times Mar 26, 2022 · else if (fieldInfo. boxedFloat = fieldInfo. GetValue (nul l); at this point we have val set to an object, which actual type is MyEnum. Instance with BindingFlags. The class is not loaded into memory until invoke or get is called on the object. The SetValue method is present on several reflection constructs. Jun 20, 2013 · object recycledEditor = fieldInfo. Sep 26, 2015 · According to Microsoft's documentation, FieldInfo. Jan 12, 2012 · In . Notes to inheritors: When you inherit from FieldInfo, you must override the following members: FieldInfo. Here are some methods to facilitate access to private members: public static T GetPrivateField<T> (this object obj, string name) { BindingFlags flags = BindingFlags. value = Mathf. Dec 2, 2010 · I have a problem : it works fine with button1 (and other buttons) but when it's a custom field it returns null : object o = f. May 28, 2019 · 也算记录自己的学习篇=。= 适合入门看 这里简单介绍下FieldInfo 和他基本的几个方法 简介 FieldInfo就是通过反射指定类获取到的 该类里面字段的属性并 Jan 2, 2023 · I've tried setting instance equal to field. BindingFlags bindingAttr); Here, bindingAttr is a bitmask comprised of one or more BindingFlags that specify how the search is conducted or Zero, to return null. Where (fi => fi. Merge FieldInfo instances keeping only explicitly set attributes. (If it’s an int, I’d call the IntField method and pass Jul 1, 2020 · The error points towards the function private void InitDict(SerializedProperty dictionary) { if (dict == null) { dict = fieldInfo. Since these are fundamentally different constructs, you need to access them differently. GetValue从另一个类获取变量和值 EN Stack Overflow用户 提问于 2019-10-27 00:30:06 Jul 6, 2010 · 换句话说，您拥有的那些FieldInfo对象对于类的所有实例都是公共的。 获取字符串数组的唯一方法是使用这些FieldInfo对象获取类的特定实例的字段值。 为此，您可以使用FieldInfo. Int32 value__，他是个隐藏的变量，用来存储枚举的 May 15, 2011 · 我需要使用反射从C#中的fieldInfo对象获取“控制”对象。 Control mainControl = Control. Emit, Linq. GetValue Method (Object), I found that the Object mean "The object whose field value will be returned. If the value of the column is null in the database, I get a Null except binder Binder A set of properties that enables the binding, coercion of argument types, and invocation of members through reflection. GetValue(object) will throw a NotSupportedException if: "A field is marked literal, but the field does not have one of the accepted literal ty Dec 4, 2021 · 1answer 2kviews C# FieldInfo reflection alternatives I am currently using FieldInfo. Type parentType = property. 如果欄位是靜態的， obj 則會忽略。 對於非靜態欄位， obj 應該是繼承或宣告欄位之類別的實例。 請注意， 傳 GetValue 回型別為 Object。 例如，如果欄位保留布爾基本值，則會傳回具有適當布爾值的 實例 Object 。 傳回值之前， GetValue 請先檢查使用者是否具有訪問許可權。 Nov 14, 2018 · The code below works properly, when I use . GetField (String,BindingFlags Note that because the constant is defined as public, the null argument can be passed to FieldInfo. If you find that your approach yields 'undefined' results, it's essential to ensure you are handling the reflection process correctly. Apr 18, 2013 · This Func<S, T> getter = s => (T)fieldInfo. Aug 25, 2021 · Since Business is your own class using reflection seems unncessary, that is why I would suggest just doing a simple method to get the information needed. I have no other access to that object. Iterate through the array of FieldInfo objects and use the GetValue () method to get the value of each field from the instance. However enums have underlaying type and enum objects can be cast to Oct 27, 2019 · 社区首页 > 问答首页 > C#反射- FieldInfo. Attributes Requires Unreferenced Code Attribute Jan 29, 2013 · if (fieldInfo != null) { dp = fieldInfo. Return Value: This method returns an object representing the public field with the specified name if found otherwise, null. Reflection is a powerful feature in C#, but it must be used with care. In a complete example, I use to look for enum value in this way: Gender retVal = Gender. target and use that information to create ObjectFields. FieldInfo GetField (string name); Here, it takes the string containing the name of the data field to get. SingleOrDefault(p => p. Pretty much the only field types we use as nulls are DateTime fields. Feb 9, 2022 · If you use C# reflection to set a (non-nullable) value-type field to null, it appears to accept that and just sets the default value. ClassInterfaceType. FieldInfo = f. GetValue returns null. SetValue would operate on the referenced value rather than the reference itself; behaving like FieldInfo. TargetInvocationException. GetValue (null) – Marcus Höglund Feb 20, 2018 at 20:09 You mean member. Let’s say I have class [System. GetValue(attr, null); The last attribute of that method can be null, since it is the index value, and that is only needed when accessing arrays, like Value[1,2]. ClassInterface (System. prefixed Sep 24, 2013 · FieldInfo. GetValue(null)). GetField(fieldName ). I need to map the attribute value to an enum, I don't want to map an enum to other dictionaries. GetValue (this, null); } } BTW - you can get property/field value by referencing an instance: var instance = new Base(); var value Nov 8, 2012 · where is my private field _baseDisposableB Read the docs on the BindingFlags enumeration: FlattenHierarchy Specifies that public and protected static members up the hierarchy should be returned. The target Oct 7, 2015 · Now the question is, I can get the FieldInfo of that field, but I try to get the value of it by fieldInfo. GetValue(obj, null)))) If the both property have values it works normaly, but sometimes i have a null property in one of these 2 objects, how can i deal with it? EDIT: If im comparing two When overridden in a derived class, returns the value of a field supported by a given object. The straight-forward approach is to use the GetValue/SetValue methods on FieldInfo and PropertyInfo. FieldInfo Public Function GetField (name As String) As FieldInfo Here are the examples of the csharp api class System. FieldInfo override this. Field)); Console. Oct 8, 2019 · 那么问题来了,再FieldInfo和Property Info中有一个方法为GetValue (Object obj),可以获取引用对象下的具备该字段/属性的值，最近就遇到了问题需要反射中来判断是否引用的同一对象，那么这个GetValue返回的到底是原来成员的引用还是复制的值。 Jun 4, 2014 · PropertyInfo. Design Class FieldInfo_IsSpecialName Public Shared Sub Main () Try ' Get the type handle of a specified class. How do I check for each of the property in the class, if they are not null (int) or empty/null (for string), then I'll convert and add that property's value to a List<string>? Mar 8, 2014 · Here is the issue public bool Invalid() { foreach (FieldInfo fInfo in this. Thanks. For PropertyInfo I use the GetValueGetter and GetValueSetter c# reflection fieldinfo Jun 6, 2017 · FieldInfo クラスは System. From the FieldInfo, get the IsStatic property. Examples The following example uses the GetValue method to retrieve the value of a static field. GetFields(BindingFlags. Reflection namespace. ToString () I'll get the string "First" because that's how enum's ToString method works. These are the top rated real world C# (CSharp) examples of FieldInfo extracted from open source projects. Jun 18, 2020 · I am tryning to retrieve a DateTime via reflection. Apr 29, 2017 · public static object GetValue (this SerializedProperty property) { System. SetValue Because an instance property doesn't exist without an instance. Aug 30, 2016 · 0 Once you get the FieldInfo of name_b, you need to call FieldInfo. For non-static fields, obj is required to be an instance of a class that inherits or declares the field. GetValue (null); where fieldtype is the type of the field, for example, int so that the line reads: int result = (int)fi. NameOfField= fieldInfo. Problem is that this field is static. Because static properties belong to the type, not individual objects, get static properties by passing null as the object argument. Runtime. NET 或 可移植类库中，请改为 catch Exception 。 Feb 24, 2019 · A MemberInfo object is typically actually one of three subclasses: FieldInfo, PropertyInfo, or MethodInfo. I want to get a list of variables from a class. The main obstacle to doing that for now is to add custom text in the game. The other method allows you to get a dependency object from a Type. If you know the name of the attribute on beforehand, you could use the dynamic behavior of it: you can call the property without the need of doing reflection FieldInfo 是 C# 反射（Reflection）机制中的一个重要类，用于获取有关字段的信息。通过 FieldInfo，你可以在运行时动态地获取或设置字段的值、获取字段的属性等等。下面列出了一些常用的 FieldInfo API，并给出了相应的代码示例。 常用 API FieldInfo. Reflection. GetFields () Console. Dec 3, 2009 · I have this method and want to get all properties from the FieldInfos? How to get it? private static void FindFields(ICollection<FieldInfo> fields, Type t) { var flags = BindingFlags. Jun 24, 2015 · Why is FieldInfo. Expla Aug 29, 2011 · If I have a bunch of instances of FieldInfo, and I already know that their FieldType is one of the types that can be passed to BinaryWriter. Enum. GetFields()) { Debug. Feb 20, 2017 · How do I get the value of a MemberInfo object? . NET. SetValue. GetValue (null) is not in fact of type Unit; You'd be safe to do a check on the type, anyway using another clause such as fi. GetValue nethod returns the value of a field supported by a given object. This would probably work as a wrapper: Reflection introduction Wikipedia says that "In computer science, reflection is the process by which a computer program can observe and modify its own structure and behaviour". In the inspector the value clearly says “none”. I put in a null check to make sure no empty fields are passed in (and thus don’t need to be serialized) and I noticed a result that I don’t understand. 10. Equals(obj. GetField("Event" + info. Dec 27, 2019 · so I'm trying to get a tuple's value using reflection, the only problem is that I get an exception: System. In my case this is no problem, but it might be when applied in other Nov 21, 2018 · It works until the code reaches Weighting[] fieldFind = (Weighting[])Fieldtype. GetValue(this. Type. GetValue(null) and the myFieldInfo. The FieldInfo class does not have a public constructor. In my opinion, nullable fields get used far too often within databases and there is usually an alternative. Net 4. GetField("MyEnum2") . Oct 9, 2019 · private class TestReadOnly { public static readonly int Field; } [TestMethod] public void TestReadOnlyField () { FieldInfo field = typeof (TestReadOnly). Dim myField As FieldInfo () = myType. GetValue ( myObject, boxedFl Nov 15, 2005 · Re: FieldInfo GetValue () Cezar <cezar. GetValue (null)); val = "hi"; Console. GetValue (null, null) returns null Asked 16 years, 11 months ago Modified 11 years, 3 months ago Viewed 13k times Jul 11, 2025 · Syntax: public System. isApplicationActive will return true, if the Editor window is focused in any way. GetValue(objTarget, null) . Enter Play mode 4. Where(fieldInfo => fieldInfo. But everyone knows Reflection isn't the most performance savvy way to go about things. // Get a Type object for Demo, and a FieldInfo for each of // the three fields. Jul 29, 2012 · I'm writing a class able to get and set values from an object by using a string pattern, by means of reflection. So private members from base classes are not 結果の配列に 0 (ゼロ) の要素がある場合、プロパティのインデックスは作成されません。 これは、抽象 GetValue メソッドの実装を、パラメーター Binder Default を に設定し、 を に設定して null 提供する null 便利な CultureInfo メソッド BindingFlags です。 Apr 13, 2011 · I examine the properties of an object via reflection and continue processing the data type of each property. , fieldInfo is not null), we use GetValue (null) on the FieldInfo object to retrieve the value of the static field. InternalEditorUtility. GetValue (data) return an object? should this be . I can finally assign gameObjects properly in my node inspector. RoundToInt(lookInput. eg. It doesn't have one. WriteLine (field. In C#, you can create a delegate to get and set values for a FieldInfo using the Delegate. How to get get the Length value of each array and then itearate through all ele Learn how to get values from an enum using reflection in C#. The SerializedProperty parameter passed into your OnGUI method contains a propertyPath field, which is a string that describes how you get from the parent object to the object currently being drawn. GetType(); System. The class works well, even on complex patterns, but I got un expected behaviour that Aug 10, 2016 · To reproduce: 1. May 1, 2018 · I have recently implemented this utility class for going through an instance's member fields recursively and assigning them default values if they are null. Private List<String> getOnlineUser Source from the Microsoft . > > Then, if the field is static everything works fine, but it doesn Aug 17, 2022 · I’ve got this action: And this binding: They both have a ScaleVector2 Processor. Is it possible to get that object instance only through the field info like so? Here are the examples of the csharp api class System. GetValue(obj, null) gives me a object value. Nov 15, 2005 · Type t = typeof (MyEnum); FieldInfo fi = t. NET Source code for the . What are the binding flags that I need to set Dec 17, 2016 · This happens because default(T) returns null because T represents a reference type. May 5, 2017 · But I really don't understand the meaning of the null in the myFieldInfo. GetType (); PropertyInfo [] PropertyInfo = ty. From what I read about C#, this should work and give me private variables. If you have an instance you need to pass it to GetValue method instead of null: string text = property. FieldInfo. Try this: prop. DefaultBinding is used. 5. Nov 26, 2021 · I'm trying to iterate through all the fields in an instance of a class and extract their name / data. FieldInfo, System. propertyPath); return fi. First of all, I can't access private fields. GetType (); FieldInfo field = type. . GetValue (null); Mar 16, 2009 · NOTE: as a general rule we try to NOT use nullable fields in the database, as nullable fields do some REALLY weird things to queries. FieldInfo class that can be used to get the value of a field. serializedObject. None)] public sealed class FieldBuilder : System. object obj but it comes up with namespace doesn't contain this type, as well as with the type I am trying to access. Log : propertyInfo. Jan 28, 2014 · Hi, I struggling with SerilizedProperty. Since the game uses i2 localization, I wasn’t able to locate where the text data is stored within the game files -and from what I could read about this plugin, this is probably because they aren’t in the game files. WriteLine (myf. Any ideas why this might not work? Are the private fields you’re attempting to get on the type of the object passed in, or on a parent May 20, 2025 · 也算记录自己的学习篇=。= 适合入门看 这里简单介绍下FieldInfo 和他基本的几个方法 #简介 FieldInfo就是通过反射指定类获取到的 该类里面字段的属性并提供对字段元数据的访问权限。 ##1. But Lists still have problems. I don’t understand what the variable is actually referencing … В следующем примере извлекается массив FieldInfo объектов , представляющий поля FieldsClass типа , а затем вызывает GetValue для отображения значения каждого поля для fieldsInst объекта . Here is my Code. NET Reference Source that represent a subset of the . Equals to avoid problems when the first FieldInfo. Reflection namespaceのクラスなので、 using を忘れずに追加します。 Type クラスには GetField メソッドが定義されており、これを使って変数の名前から FieldInfo オブジェクトを取得できます。 Aug 21, 2011 · Accessing private members of a class is generally not a good thing. GetField ("Fir st"); object val = fi. I haven't tried to compile this but doesn't f. public class Program { public static void Main() { Business. GetValue(property2); Goal is to create a delegate from the expression to cache it because we need to call this repeatedly. InteropServices. Host-only mod. Code: FieldInfo xSortField = xFieldInfo. If you are looking for static properties use BindingFlags. GetValue (property. targetObject) as EditableDictionary<TK, TV>; } } dict in this case is a member of the editor script that points to the underlying EditableDictionary object. GetType(typeName ). I want to loop through each variable and get its type. GetField(this. GetValue return null for a private member while debugger indicates field is non null? Asked 14 years, 7 months ago Modified 11 years, 10 months ago Viewed 3k times 如果字段为静态字段， obj 则忽略 。 对于非静态字段， obj 应是继承或声明字段的类的实例。 请注意， 的 GetValue 返回类型为 Object。 例如，如果 字段包含布尔基元值，则返回具有相应布尔值的 实例 Object 。 在返回值之前， GetValue 检查用户是否具有访问权限。 I understand they are different, however they both, at a very basic level are a means of storing and retrieving data and both FieldInfo and PropertyInfo have a method called "GetValue" that accepts an object that has a field/property of that name. Since it's a static field, we pass null as the target object. GetValue(x). Returns: NULL reference exception while reading user sessions (Reflection)I have implemented the code for reading the active sessions using the reference Learn about the System. Where(field => !objTarget . GetField (String) 获取该类的指定的名字String公开的字段 如果私有会为空 Type. You could change your method to: public static T Test<T>(MyClass myClass) where T : MyClass2, new() { var result = new T(); } and then it will work as you want it to. Well i tried this: (still no luck with it) FieldInfo [] fields = Obj. Use the FieldInfo to display field // name, value for the Demo object in d, and attributes. ToString () to put into the string FieldInfo provides access to the metadata for a field within a class and provides dynamic set and get functionality for the field. Public | BindingFlags. GameObject ob = property. WriteLine (ControlChars. public void ConvertDataFrameToValueFields() { List<byt A FieldInfo object having the specified name and binding attributes, or null if the field does not exist. I faced the same issue when i tried to get the properties using this syntax (where "ConfigValues" is a static class with static properties and I am looking for a property with the name "LookingFor") PropertyInfo propertyInfo = ConfigValues. GetValue (null)); field. _bar; } } } I want to find the private item _bar that I will mark with a attribute. The code example below: public cl Get the Type of the class using the GetType () method on the instance. Jun 4, 2024 · Reflection A . I think you can do this with FieldInfo but I don't have a snippet, if you know how to do Feb 5, 2014 · This method compares two objects of the same class: foreach (var field in fields. Static); var languages = (List)fieldInfo. S Apr 12, 2015 · In this debug. net May 21, 2015 · By constructing an object of this Type with a MemberInfo object (either FieldInfo or PropertyInfo), the object takes the place of the SetValue and GetValue from Reflection. The value is not inside a class or a static class, but it is from a lambda expression . Name returns the name of the variable, but I need the value. If the constant were defined as private, an instance of the MyClass type would need to be passed as the argument to FieldInfo. Mar 26, 2013 · If your class is a SerializedObject (or any child of Object), you can use property. GetProperties(). If you think that’s a bit annoying, I agree. GetValue () (but this time using the "Value" property). FieldType. Dim myType As Type = GetType (ViewTechnology) ' Get the fields of a specified class. GetField (“_supportedLanguages”, BindingFlags. cs at main Jul 23, 2025 · 通过Type. Nov 24, 2024 · In this blog, we’ll explore the key reflection methods and explain how they work with examples. GetField( _name ). GetValue ()返回null EN Stack Overflow用户 提问于 2020-03-04 22:20:12 May 5, 2015 · FieldInfo / PropertyInfo -- GetValue / SetValue Alternatives I was writing a framework that required access to an application-specific set of fields/properties. Is that possible? I have done this with properties where I have looked for an attribute, but never a private member field. Cr + "Displaying fields that have SpecialName attributes Nov 15, 2021 · return false; } object currentValueObject = fieldInfo. GetValue (null)就能获取到值，注意是传入null，像获取静态值和常量那样。 返回的值可以直接强转为int，因为枚举的基础类型就是int。 如果获取所有的字段信息，会发现里面有个System. Describe the bug Attempting to save/serialize a DynamoDB class with SaveAsync / SaveHelper causes the reflection to attempt to call GetValue with limited parameters when there is an indexer property and save fails / throws an exception. It is null since the field is static, i. Code that use this feature can be hard to maintain. GetValue. e. GetType() 返回我需要的类型 C# (CSharp) FieldInfo. Male; fore How to get Property Value from MemberExpression without . obj 参数是 null 且该字段为实例字段。 注意：在 适用于 Windows 应用商店应用的 . Apr 5, 2023 · Session values lost on switching server with statesession in asp. Here are my (desired) steps. Why is my data not saved to my database? MSDN: Data Walkthroughs | "How Do I?" Videos My Blog: Custom Events | Data Among Multiple Forms Beginner Tutorial 0 M Oct 17, 2014 · We then extract the value of the field and pass in null as the instance parameter on which the field value should be found. Write(), how do I automatically pass the field of a gi Dec 17, 2018 · 文章浏览阅读1. Balanced, tense, unpredictable fun - with full config support. net webform with webfarm blue/green Oct 9, 2016 · UnityEditorInternal. So i have a type instance list and i'm iterating trough all the fields that the propertyType. GetValue - 60 examples found. GetType(). GetValue(null), and it always returns null. nasui@po lymtl. You may need to cast it to the appropriate type. ComponentModel. Default values for reference types are null. GetValue (null) asDependencyProperty; } return dp; } The usage is simple. NonPublic | BindingFlags. fieldInfo for all Serializable types: GameObject ob = fieldInfo. Invoke(null, parameters); } As suggested, don’t forget to cache the data, you don’t need to assign the values everytime. GetGenericTypeDefinition() == typeof (List<>)) Nov 12, 2015 · I’m trying to automate the process of drawing node GUI. Was pretty hard to find, because it’s not documented, but InternalEditorUtility is a gem, there is much to discover. If the field reflected by the current instance is static, obj is ignored. Feb 20, 2019 · EventHandlerList eventHandlerList = (EventHandlerList)propertyInfo. Feb 18, 2015 · To get all fields, I am using GetFields() that returns a FieldInfo[] object, and from fieldInfo object, we can get its information. Name; return false; }); There are some shortcomings with this approach: The static constructor has to be invoked through manual intervention before any Unit fields can be accessed The NameOfField setter is public. Dec 30, 2015 · First thing - thing is a field, not a property. Private static members in inherited classes are not returned. targetObject. NET framework in C# A simple mod inspired by runescape dragonwilds, almost exactly like my airdash but instead of mid air movement, its a ground movement. NET Standard 2: The FieldInfo. And it worked (kinda). GetValue(object obj)：获取字段的值。 FieldInfo. action. Contains("ExtensionConfig"), that type has a method which i need to invoke foreach field and i'm iterating trough the fields So basically the problem comes when i do `(field as PropertyInfo). fi. NET MAUI) data bindings allow properties of two objects to be linked so that a change in one causes a change in the other. SetValue (null, obj) doesn't really work for static readonly member Asked 5 years, 8 months ago Modified 5 years, 8 months ago Viewed 273 times Apr 30, 2017 · Here is how I both get the types of SerializedProperties, AND get /set the values as object ’s public static object GetValue(this SerializedProperty property) { System. net 3. Discover code examples and best practices for effective implementation. Static members include fields, methods, events, and properties. BindingFlags. But since this behavior is slightly unexpected (I'd expect an This is a mod utility to allow me to use the description field within the upgrade asset file. I've solved this by changing this lines [System. In code, two steps are required: The BindingContext property of the target object must be set to the source object, The SetBinding method (often used in conjunction with the Binding class) must be called on the target object to bind a property of that object to a property of the source object. GetValue(null)!; Notice that we're using the GetValue method on the fieldInfo object. GetField(itsName, bF) If fI IsNot Nothing Then ret = fI. GetValue (null)) which give the static value for field or variable. ca> wrote: [color=blue] > I'm trying to get the value of a field in a class using > Reflection. One method allows you to pass in the dependency object instance, plus the string representation of the DependencyProperty on the object. GetValue and FieldInfo. GetValue returns always null: and the Type matches: Hi, I'm trying to get the value of a field in a class using Reflection. Static) . This tutorial shows how to use C# FieldInfo type GetValue (object obj) method. Here is the implementation in the NullHa Jun 20, 2020 · I found a bug in Addressables 1. Static)获取枚举值列表，然后通过FieldInfo. Here is my (reduced) source: private void ExamineObject(object o) { Type type = default( Aug 10, 2013 · I'm trying to get an instance value of a generic type from a static field inside a generic class, and it throws this exception: Late bound operations cannot be performed on fields with types for Get field value FieldInfo. Once you have both of those, you can call methodInfo. GetFields (BindingFlags. But FieldInfo. GetValue() call to retrieve and later set the value of m_myField. This is a very valuable tool, and while data bindings can be defined entirely in code, XAML provides shortcuts and convenience. GetValue(null); I would like to know is there any faster way to access such as using Reflection. Is there any way to get value of private static field from known class using reflection? Mar 14, 2018 · Using c# reflection to get & set the value of the generic fields inside a generic object. NET is a cross-platform runtime for cloud, mobile, desktop, and IoT apps. However in order to do this i need to have the Type ty = t. FromHandle(a_hWnd); object oMainControlObject = mainControl; FieldInfo[] fieldInfos = oMainControlObject Sep 17, 2021 · As it is, I will only be building these tables once when they're first needed. The fields themselves are instances of custom classes for storing data with some specific featu Sep 5, 2024 · alijaya commented on Jan 15 Hi, I've tested this, and somehow fieldInfo is not always non-null, so there's a case where it's null, not sure what. Conceptually, this method changes the value of an actual part of memory based on a reflected object. Convert to object: The value returned from GetValue will be an object. GetValue(null); I've used this code in another area but it is not working here, I've tried with System. I know MSDN says you can access > them if the code is fully trusted, but what that means? > I added at the end some code I used. GetValue (i_obj, null) Imports System. GetField ("val"); Console. Some of my nodes use fields like List and those parts are still handled inside the OnInspectorGUI. Note that I'm assuming that Price is a property, but in reality you would write a GetValue method that handles property / field. Give some comment for above code if it is useful. GetValue: This method gets the value of the member for the specified object. Feb 13, 2012 · as Jon suggested above, better to use object. Later FieldInfo instances override earlier ones. GetValue (control); // if f is a fieldinfo from a field of type MyClass, o = null Whereas f has good values Feb 28, 2023 · 在C#中，反射（Reflection）是指在运行时检查类型、对象、成员以及调用成员的能力。其中，反射获得属性的值是反射中常用的操作之一。在使用反射获得属性值时，需要用到GetValue()方法。在使用GetValue()方法获取属性值时，需要注意obj和index参数的值，以确保能够正确获取属性值。 在C#中，反射（R Nov 13, 2015 · OK So I'm using the code below which I found in stack overflow. SetValue methods. Apr 3, 2015 · I’ve been writing a generic serialization system over the past few days and it’s getting close to complete right now. SetValue((Person)((FieldInfo)member). GetField("Field"). XXXInfos. AddListener(Thing); slider. MyEventsInvocationList(); foreach (var x in xyz) Console. GetRuntimeFields () taken from open source projects. I already have encountered the methods which costs some time. In this method, I am using BindingFlags (which is an enum) that controls binding and the way in which the exploring for members and types is used by reflection. C# (CSharp) FieldInfo - 60 examples found. 0 or 3. And at this point it fails since FieldInfo. WriteLine ("Exception : {0}", e. An object that contains the field value to be returned. GetValue (object) taken from open source projects. GetValue (null)); } } 示例：获取对象实例的字段值 } } catch (Exception e) { Console. button2, null); FieldInfo fieldInfo = (typeof (Control). This is because the fieldInfo object is a FieldInfo object, which is a base class for all fields. GetValue(property. Last edited by kebo; Dec 19th, 2014 at 10:02 AM. Dec 10, 2015 · FieldInfo [] fields = typeof (MyDictionary). GetValue(this), "new name", null) Not sure if you need to cast the first argument like this: prop. The usage of a configuration file is to avoid using refle Apr 5, 2011 · { ((IUnit)fieldInfo. GetType(); PropertyInfo abstract member GetField : string -> System. I am tryning to retrieve a DateTime via reflection. May 7, 2014 · I have a 'speed problem' with a program im currently developing. GetType (); System. You also need the MethodInfo of typeof (class_b). Jan 30, 2024 · return (T)fieldInfo. The MSDN is useless as it only shows an example with null as the object and you can not use null when the field is non-static. GetValue(_centralParams). Example of use would look like this: static object boxedFloat = null; . GetValue (null) not working in static constructor Asked 10 years ago Modified 10 years ago Viewed 1k times Mar 5, 2020 · I'm trying to get filed values in a nested static class by this simple code: public static class DataConstants { public static class Roles { public static readonly Role[] All = new L Oct 27, 2019 · so I'm trying to add some stuff to my debug output and I'm currently trying to dynamically get the class variables and the values of it. CreateDelegate method. GetFields (); MyDictionary is a static class, all fields are string arrays. Nov 26, 2021 · 但是，我必须手动检查字段中对象的类型，然后将其强制转换为该类型的新实例，以便访问值成员。这很烦人，因为每次我向CentralParams类添加新的数据类型时，我都必须在这里显式地处理它。 有没有一种方法可以将它动态地转换为正确类型的空变量？ v. You need to pass null to GetValue, since this field doesn't belong to any instance: fields[0]. Open the project attached by the user 2. Press R Crash! NOTE: commenting . Any help is much appreciated. Jun 24, 2010 · foreach (FieldInfo fi in objFieldInfo. FieldInfo [] GetFields (System. Reflection, which is Aug 30, 2011 · In C# how do you use reflection to get variables that doesn't have getters/setters? For example the getValue method below will work for d2, but not d1. GetValue, indicating that the constant is a static field. And: It bridges the gap between reading the metadata as reflected information and mutating the actual program's memory. Reflection Imports System. Instance | BindingFlags. I use Odin Inspector & Serializer add-on for serializing Dictionary field in my script. SetValue(stat, ff,null); Debug. NET Multi-platform App UI (. Doesn’t work for all sorts of things (Transforms, GameObjects, assets etc). Static | BindingFlags. FieldType == typeof (Unit), or something similar, such that: You can, but you'll need to use reflection: bool hasIt = typeof (MyEnums). So it is not possible to get a value of an instance property without providing an instance. Aug 7, 2015 · But fieldInfo is reflection data that refers to the array field on the parent. (is it an int, float, or something else?) Based on the variable’s type, I want to call a GUI function to display and set the variable’s value. // so we can use reflection to access the object properties public static Object GetPropValue(this Object obj, String name) Aug 30, 2024 · Browse the sample . Sep 27, 2015 · while using reflection to get the value of static field: fieldInfo. 0, I use System. We need to cast it to the specific enum type, which is why we use the T generic type parameter. 0 or higher it seems to be impossible to catch an exception, that occurs inside the code, that is performed by GetValue. If I try to do val. Use FieldInfo, and call GetMethod and GetProperties. Message); } } } 下面举一个很实用的例子 Feb 6, 2014 · Since the above class is a static class, I cannot create an instance of it in order to utilize pass such into a FieldInfo. var field = property2. Honestly, not sure what's wrong. GetField (nameof (TestReadOnly. You are trying to set the Name property of your Employee class's _person field. There is the Oct 21, 2023 · How do you iterate through nested classes to get the property field of each nested class? Nested Classes: public static class Permissions { public static class Aircraft { public const Sep 11, 2013 · This doesn’t work for some reason. GetProperty(field). NET program that uses reflection can examine it own surface—its fields, methods, types. GetField(property. Adds a standalone mission for Cranius within the 'Replay Missions' menu. WriteLine(x); } private static void MyFancyEventListener(object Feb 20, 2018 · asked Feb 20, 2018 at 20:00 Meital Machorlo 3 1 2 Pass null to the GetValue function: member. If you find any suggestion than please reply. The value is not inside a class or a static class, but it is from a lambda expression I have this really simple lambda expression: ATest => object product = ((FieldInfo)captureToProduct. GetCustomAttribute Jul 11, 2025 · Syntax: public abstract System. I have a sample script named TestScript which looks like this: public class TestScript : MonoBehaviour { public Apr 23, 2015 · i'm trying to getField but is always returning null Here's a image of the code and the watchs of the variables. FieldInfo provides access to the metadata for a field within a class and provides dynamic set and get functionality for the field. SetValue () and PropertyInfo. 如何获取? Type. These include PropertyInfo and FieldInfo. SetValue(object obj So my problem is this: I have an object instance represented only by FieldInfo. there’s no need for an instance. GetValue(this)) //Log Says null Nov 23, 2018 · The problem is it the first function does not return private fields. NET Framework - referencesource/mscorlib/system/reflection/fieldinfo. GetValue (null) It always fails because of the null parameter. net 4. See full list on blog. Jun 4, 2024 · So in following code, I get all the FieldInfo’s from the editor. 次の例では、型のフィールドを表す オブジェクトの FieldInfo 配列を FieldsClass 取得し、 を呼び出 GetValue してオブジェクトの各フィールドの値を fieldsInst 表示します。 Nov 26, 2016 · This new method would accept an "object" to which a Value could be copied instead of being unnecessarily boxed. So how can I get that value? Sep 8, 2018 · Can not check correctly to catch this strange “null” ☹ Do you have any idea what is going on? How to get a Nullable<T> (instead of the underlying value) through FieldInfo. Static and call GetValue with null: Jan 8, 2025 · If I remember correctly, when calling GetValue to get the value for a static field, you specify null for the instance to get the value from. Here are the examples of the csharp api class System. Has anyone been able to successfuly retrieve the value of a field that is non-static using the GetValue method? What is the obj parameter supposed to equal. Static with GetProperties. Another thing is that you have to change parameter type to get it working: public class Base { public string thing = "Thing"; public T GetAttribute<T> ( string _name ) { return (T)typeof(Base). className would be automatically given the name of the class that a variable is found in (dont exactly know how to get it from a FieldInfo) variableName would automatically be given the name of the Field using FieldInfo. With . Fields are variables defined in the class. Oct 15, 2014 · If the name of the property is changing, you should use GetValue: info. objectReferenceValue to get a reference to it. Mar 4, 2020 · 社区首页 > 问答首页 > 对于嵌套的静态类公共静态字段，FieldInfo. GetValue(f) End If Return ret End Function I found the code and the question here but google let me down, and I couldn't find an answer. This method allows you to create a delegate for a method that has the same signature as the FieldInfo. It will return protected (marked as Family) and even internal (marked as Assembly), but none of my private fields. onValueChanged. GetValue(obj); case PropertyInfo propertyInfo: return propertyInfo. Name == "LookingFor"); The solution was to use the typeof operator instead PropertyInfo propertyInfo Oct 2, 2012 · You would have to define an interface with the GetValue () and SetValue () and use extend ParameterInfo and FieldInfo to implement this interface. csdn. Expression or other methods. GetValue (a) returned the underlying value instead of the nullable and the "Value" property is declared in the Nullable<> structure. - dotnet/runtime No more safe hallways. I am interested in understanding when one should be used over the other (preferably with a small code snippet). If performance is the key I recommend to use the Expression. Nov 12, 2020 · Type. Discovers the attributes of a property and provides access to property metadata. Member). MyCustomType was unfortunately a struct, so changing this to a class made it work. Use the GetFields () method of the Type class to retrieve an array of FieldInfo objects representing the fields of the class. GetValue(null) Sep 28, 2015 · while using reflection to get the value of static field: fieldInfo. IsGenericType && fieldInfo. GetCustomAttribute(typeof (ObsoleteAttribute)) != null; In the other hand, you can get all obsolete enum fields using some LINQ: IEnumerable<FieldInfo> obsoleteEnumValueFields = typeof (MyEnums) . If binder is null, then Binder. Jun 6, 2012 · Latter the code does the same thing using the result of FieldInfo. Oct 15, 2024 · Data bindings connect properties of two objects, called the source and the target. Log(fInfo. I tried some stuff and got it working quite fast when I adde This is a convenience method that provides an implementation for the abstract GetValue method with a BindingFlags parameter of Default, the Binder set to null, and the CultureInfo set to null. GetValue从另一个类获取变量和值 问 C#反射- FieldInfo. Each reflection method will be detailed in separate outputs for better understanding. BaseType. GetValues(typeof(Gender)) to get the list of enum item. GetValue(argument. GetValue (null) to get the actual value (the instance of class_b). Contains ("_POSTFIX"))) is used to fetch number of fields from static class where variable name is ending with "_POSTFIX". GetValue () do not work for structures, only classes. GetValue and PropertyInfo. Serializable] public class ItemRandom { public bool test = false; public int test2 = 4; } And I want to save them like preset in a list of ScriptableObject [System. FieldInfo objects are obtained by calling either the GetFields or GetField method of a Type object. 1gly f4m wjw04 3jm t4 cbxo nsyaep 7teg91tz grw hlta