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FieldInfo Class

July 28, 2014

Discovers the attributes of a field and provides access to field metadata.

Namespace:  System.Reflection
Assembly:  mscorlib (in mscorlib.dll)

public abstract class FieldInfo : MemberInfo

The FieldInfo type exposes the following members.

  NameDescription
Public propertyAttributesGets the attributes that are associated with this field.
Public propertyCustomAttributesGets a collection that contains this member's custom attributes. (Inherited from MemberInfo.)
Public propertyDeclaringTypeGets the class that declares this member. (Inherited from MemberInfo.)
Public propertyFieldHandleGets a handle to the internal metadata representation of a field.
Public propertyFieldTypeGets the type of this field object.
Public propertyIsAssemblyGets a value that indicates whether the potential visibility of this field is described by FieldAttributes.Assembly; that is, the field is visible at most to other types in the same assembly, and is not visible to derived types outside the assembly.
Public propertyIsFamilyGets a value that indicates whether the visibility of this field is described by FieldAttributes.Family; that is, the field is visible only within its class and derived classes.
Public propertyIsFamilyAndAssemblyGets a value that indicates whether the visibility of this field is described by FieldAttributes.FamANDAssem; that is, the field can be accessed from derived classes, but only if they are in the same assembly.
Public propertyIsFamilyOrAssemblyGets a value that indicates whether the potential visibility of this field is described by FieldAttributes.FamORAssem; that is, the field can be accessed by derived classes wherever they are, and by classes in the same assembly.
Public propertyIsInitOnlyGets a value that indicates whether the field can be set only in the body of the constructor.
Public propertyIsLiteralGets a value that indicates whether the value is written at compile time and cannot be changed.
Public propertyIsNotSerializedGets a value that indicates whether this field has the NotSerialized attribute.
Public propertyIsPinvokeImplGets a value that indicates whether the corresponding PinvokeImpl attribute is set in FieldAttributes.
Public propertyIsPrivateGets a value that indicates whether the field is private.
Public propertyIsPublicGets a value that indicates whether the field is public.
Public propertyIsSpecialNameGets a value that indicates whether the field has a name that has special significance.
Public propertyIsStaticGets a value that indicates whether the field is static (Shared in Visual Basic).
Public propertyMemberTypeGets a value that indicates that this member is a field. (Overrides MemberInfo.MemberType.)
Public propertyMetadataTokenGets a value that identifies a metadata element. (Inherited from MemberInfo.)
Public propertyModuleGets the module in which the type that declares the member represented by the current MemberInfo is defined. (Inherited from MemberInfo.)
Public propertyNameGets the name of the current member. (Inherited from MemberInfo.)
Public propertyReflectedTypeGets the class object that was used to obtain this instance of MemberInfo. (Inherited from MemberInfo.)
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  NameDescription
Public methodEqualsReturns a value that indicates whether this instance is equal to a specified object. (Overrides MemberInfo.Equals(Object).)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetCustomAttributes(Boolean)When overridden in a derived class, returns an array of all custom attributes applied to this member. (Inherited from MemberInfo.)
Public methodGetCustomAttributes(Type, Boolean)When overridden in a derived class, returns an array of custom attributes applied to this member and identified by Type. (Inherited from MemberInfo.)
Public methodStatic memberGetFieldFromHandle(RuntimeFieldHandle)Gets a FieldInfo for the field represented by the specified handle.
Public methodStatic memberGetFieldFromHandle(RuntimeFieldHandle, RuntimeTypeHandle)Gets a FieldInfo for the field represented by the specified handle, for the specified generic type.
Public methodGetHashCodeReturns the hash code for this instance. (Overrides MemberInfo.GetHashCode().)
Public methodGetRawConstantValueReturns a literal value associated with the field by a compiler.
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodGetValueWhen overridden in a derived class, returns the value of a field supported by a given object.
Public methodIsDefinedWhen overridden in a derived class, indicates whether one or more attributes of the specified type or of its derived types is applied to this member. (Inherited from MemberInfo.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodSetValue(Object, Object)Sets the value of the field that is supported by the given object.
Public methodSetValue(Object, Object, BindingFlags, Binder, CultureInfo)When overridden in a derived class, sets the value of the field with the specified constraints on type conversion.
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
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  NameDescription
Public Extension MethodGetCustomAttribute(Type)Overloaded. Retrieves a custom attribute of a specified type that is applied to a specified member. (Defined by CustomAttributeExtensions.)
Public Extension MethodGetCustomAttribute(Type, Boolean)Overloaded. Retrieves a custom attribute of a specified type that is applied to a specified member, and optionally inspects the ancestors of that member. (Defined by CustomAttributeExtensions.)
Public Extension MethodGetCustomAttribute<T>()Overloaded. Retrieves a custom attribute of a specified type that is applied to a specified member. (Defined by CustomAttributeExtensions.)
Public Extension MethodGetCustomAttribute<T>(Boolean)Overloaded. Retrieves a custom attribute of a specified type that is applied to a specified member, and optionally inspects the ancestors of that member. (Defined by CustomAttributeExtensions.)
Public Extension MethodGetCustomAttributes()Overloaded. Retrieves a collection of custom attributes that are applied to a specified member. (Defined by CustomAttributeExtensions.)
Public Extension MethodGetCustomAttributes(Type)Overloaded. Retrieves a collection of custom attributes of a specified type that are applied to a specified member. (Defined by CustomAttributeExtensions.)
Public Extension MethodGetCustomAttributes<T>()Overloaded. Retrieves a collection of custom attributes of a specified type that are applied to a specified member. (Defined by CustomAttributeExtensions.)
Public Extension MethodGetCustomAttributes<T>(Boolean)Overloaded. Retrieves a collection of custom attributes of a specified type that are applied to a specified member, and optionally inspects the ancestors of that member. (Defined by CustomAttributeExtensions.)
Public Extension MethodIsDefinedIndicates whether custom attributes of a specified type are applied to a specified member. (Defined by CustomAttributeExtensions.)
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The FieldInfo class does not have a public constructor. FieldInfo objects are obtained by calling either Type.GetFields or Type.GetField.

Fields are variables that are defined in the class. FieldInfo provides access to the metadata for a field in a class and also enables late-bound access to the value of a field. In Windows Phone, you can get the metadata of any field, regardless of its access level, but you cannot use FieldInfo to bypass access-level protection when you get or set the value of a field.

The following example uses the Type.GetFields method to get the fields of the Example class, and then displays information about the fields.


using System;
using System.Reflection;

public class Example
{
   public int myField1 = 0;
   protected string myField2 = null;
   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      FieldInfo[] myFieldInfo;
      Type myType = typeof(Example);
      // Get the type and fields of Example.
      myFieldInfo = myType.GetFields(BindingFlags.NonPublic | BindingFlags.Instance
          | BindingFlags.Public);
      outputBlock.Text += "\nThe fields of " +
          "Example are \n" + "\n";
      // Display the field information of Example.
      for (int i = 0; i < myFieldInfo.Length; i++)
      {
         outputBlock.Text += String.Format("\nName            : {0}", myFieldInfo[i].Name) + "\n";
         outputBlock.Text += String.Format("Declaring Type  : {0}", myFieldInfo[i].DeclaringType) + "\n";
         outputBlock.Text += String.Format("IsPublic        : {0}", myFieldInfo[i].IsPublic) + "\n";
         outputBlock.Text += String.Format("MemberType      : {0}", myFieldInfo[i].MemberType) + "\n";
         outputBlock.Text += String.Format("FieldType       : {0}", myFieldInfo[i].FieldType) + "\n";
         outputBlock.Text += String.Format("IsFamily        : {0}", myFieldInfo[i].IsFamily) + "\n";
      }
   }
}


Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

This type is thread safe.

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