FieldBuilder Class
Defines and represents a field. This class cannot be inherited.
Assembly: mscorlib (in mscorlib.dll)
System.Reflection.MemberInfo
System.Reflection.FieldInfo
System.Reflection.Emit.FieldBuilder
| Name | Description | |
|---|---|---|
![]() | Attributes | Indicates the attributes of this field. This property is read-only.(Overrides FieldInfo.Attributes.) |
![]() | CustomAttributes | Gets a collection that contains this member's custom attributes.(Inherited from MemberInfo.) |
![]() | DeclaringType | Indicates a reference to the Type object for the type that declares this field. This property is read-only.(Overrides MemberInfo.DeclaringType.) |
![]() | FieldHandle | Indicates the internal metadata handle for this field. This property is read-only.(Overrides FieldInfo.FieldHandle.) |
![]() | FieldType | Indicates the Type object that represents the type of this field. This property is read-only.(Overrides FieldInfo.FieldType.) |
![]() | IsAssembly | Gets a value indicating 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.(Inherited from FieldInfo.) |
![]() | IsFamily | Gets a value indicating whether the visibility of this field is described by FieldAttributes.Family; that is, the field is visible only within its class and derived classes.(Inherited from FieldInfo.) |
![]() | IsFamilyAndAssembly | Gets a value indicating 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.(Inherited from FieldInfo.) |
![]() | IsFamilyOrAssembly | Gets a value indicating 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.(Inherited from FieldInfo.) |
![]() | IsInitOnly | Gets a value indicating whether the field can only be set in the body of the constructor.(Inherited from FieldInfo.) |
![]() | IsLiteral | Gets a value indicating whether the value is written at compile time and cannot be changed.(Inherited from FieldInfo.) |
![]() | IsNotSerialized | Gets a value indicating whether this field has the NotSerialized attribute.(Inherited from FieldInfo.) |
![]() | IsPinvokeImpl | Gets a value indicating whether the corresponding PinvokeImpl attribute is set in FieldAttributes.(Inherited from FieldInfo.) |
![]() | IsPrivate | Gets a value indicating whether the field is private.(Inherited from FieldInfo.) |
![]() | IsPublic | Gets a value indicating whether the field is public.(Inherited from FieldInfo.) |
![]() | IsSecurityCritical | Gets a value that indicates whether the current field is security-critical or security-safe-critical at the current trust level. (Inherited from FieldInfo.) |
![]() | IsSecuritySafeCritical | Gets a value that indicates whether the current field is security-safe-critical at the current trust level. (Inherited from FieldInfo.) |
![]() | IsSecurityTransparent | Gets a value that indicates whether the current field is transparent at the current trust level.(Inherited from FieldInfo.) |
![]() | IsSpecialName | Gets a value indicating whether the corresponding SpecialName attribute is set in the FieldAttributes enumerator.(Inherited from FieldInfo.) |
![]() | IsStatic | Gets a value indicating whether the field is static.(Inherited from FieldInfo.) |
![]() | MemberType | Gets a MemberTypes value indicating that this member is a field.(Inherited from FieldInfo.) |
![]() | MetadataToken | Gets a value that identifies a metadata element.(Inherited from MemberInfo.) |
![]() | Module | Gets the module in which the type that contains this field is being defined.(Overrides MemberInfo.Module.) |
![]() | Name | Indicates the name of this field. This property is read-only.(Overrides MemberInfo.Name.) |
![]() | ReflectedType | Indicates the reference to the Type object from which this object was obtained. This property is read-only.(Overrides MemberInfo.ReflectedType.) |
| Name | Description | |
|---|---|---|
![]() | Equals(Object) | Returns a value that indicates whether this instance is equal to a specified object.(Inherited from FieldInfo.) |
![]() | GetCustomAttributes(Boolean) | Returns all the custom attributes defined for this field.(Overrides MemberInfo.GetCustomAttributes(Boolean).) |
![]() | GetCustomAttributes(Type, Boolean) | Returns all the custom attributes defined for this field identified by the given type.(Overrides MemberInfo.GetCustomAttributes(Type, Boolean).) |
![]() | GetCustomAttributesData() | Returns a list of CustomAttributeData objects representing data about the attributes that have been applied to the target member.(Inherited from MemberInfo.) |
![]() | GetHashCode() | Returns the hash code for this instance.(Inherited from FieldInfo.) |
![]() | GetOptionalCustomModifiers() | Gets an array of types that identify the optional custom modifiers of the field.(Inherited from FieldInfo.) |
![]() | GetRawConstantValue() | Returns a literal value associated with the field by a compiler. (Inherited from FieldInfo.) |
![]() | GetRequiredCustomModifiers() | Gets an array of types that identify the required custom modifiers of the property.(Inherited from FieldInfo.) |
![]() | GetToken() | Returns the token representing this field. |
![]() | GetType() | |
![]() | GetValue(Object) | Retrieves the value of the field supported by the given object.(Overrides FieldInfo.GetValue(Object).) |
![]() | GetValueDirect(TypedReference) | Returns the value of a field supported by a given object.(Inherited from FieldInfo.) |
![]() | IsDefined(Type, Boolean) | Indicates whether an attribute having the specified type is defined on a field.(Overrides MemberInfo.IsDefined(Type, Boolean).) |
![]() | SetConstant(Object) | Sets the default value of this field. |
![]() | SetCustomAttribute(ConstructorInfo, Byte()) | Sets a custom attribute using a specified custom attribute blob. |
![]() | SetCustomAttribute(CustomAttributeBuilder) | Sets a custom attribute using a custom attribute builder. |
![]() | SetMarshal(UnmanagedMarshal) | Obsolete. Describes the native marshaling of the field. |
![]() | SetOffset(Int32) | Specifies the field layout. |
![]() | SetValue(Object, Object) | Sets the value of the field supported by the given object.(Inherited from FieldInfo.) |
![]() | SetValue(Object, Object, BindingFlags, Binder, CultureInfo) | Sets the value of the field supported by the given object.(Overrides FieldInfo.SetValue(Object, Object, BindingFlags, Binder, CultureInfo).) |
![]() | SetValueDirect(TypedReference, Object) | Sets the value of the field supported by the given object.(Inherited from FieldInfo.) |
![]() | ToString() | Returns a string that represents the current object.(Inherited from Object.) |
| Name | Description | |
|---|---|---|
![]() ![]() | _FieldBuilder.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr) | Maps a set of names to a corresponding set of dispatch identifiers. |
![]() ![]() | _FieldBuilder.GetTypeInfo(UInt32, UInt32, IntPtr) | Retrieves the type information for an object, which can then be used to get the type information for an interface. |
![]() ![]() | _FieldBuilder.GetTypeInfoCount(UInt32) | Retrieves the number of type information interfaces that an object provides (either 0 or 1). |
![]() ![]() | _FieldBuilder.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr) | Provides access to properties and methods exposed by an object. |
![]() ![]() | _FieldInfo.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr) | Maps a set of names to a corresponding set of dispatch identifiers.(Inherited from FieldInfo.) |
![]() ![]() | _FieldInfo.GetType() | |
![]() ![]() | _FieldInfo.GetTypeInfo(UInt32, UInt32, IntPtr) | Retrieves the type information for an object, which can then be used to get the type information for an interface.(Inherited from FieldInfo.) |
![]() ![]() | _FieldInfo.GetTypeInfoCount(UInt32) | Retrieves the number of type information interfaces that an object provides (either 0 or 1).(Inherited from FieldInfo.) |
![]() ![]() | _FieldInfo.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr) | Provides access to properties and methods exposed by an object.(Inherited from FieldInfo.) |
![]() ![]() | _MemberInfo.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr) | Maps a set of names to a corresponding set of dispatch identifiers.(Inherited from MemberInfo.) |
![]() ![]() | _MemberInfo.GetType() | Gets a Type object representing the MemberInfo class.(Inherited from MemberInfo.) |
![]() ![]() | _MemberInfo.GetTypeInfo(UInt32, UInt32, IntPtr) | Retrieves the type information for an object, which can then be used to get the type information for an interface.(Inherited from MemberInfo.) |
![]() ![]() | _MemberInfo.GetTypeInfoCount(UInt32) | Retrieves the number of type information interfaces that an object provides (either 0 or 1).(Inherited from MemberInfo.) |
![]() ![]() | _MemberInfo.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr) | Provides access to properties and methods exposed by an object.(Inherited from MemberInfo.) |
| Name | Description | |
|---|---|---|
![]() | GetCustomAttribute(Type) | Overloaded. Retrieves a custom attribute of a specified type that is applied to a specified member.(Defined by CustomAttributeExtensions.) |
![]() | GetCustomAttribute(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.) |
![]() | GetCustomAttribute(Of T)() | Overloaded. Retrieves a custom attribute of a specified type that is applied to a specified member.(Defined by CustomAttributeExtensions.) |
![]() | GetCustomAttribute(Of 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.) |
![]() | GetCustomAttributes() | Overloaded. Retrieves a collection of custom attributes that are applied to a specified member.(Defined by CustomAttributeExtensions.) |
![]() | GetCustomAttributes(Type) | Overloaded. Retrieves a collection of custom attributes of a specified type that are applied to a specified member.(Defined by CustomAttributeExtensions.) |
![]() | GetCustomAttributes(Of 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.) |
![]() | IsDefined(Type) | Overloaded. Indicates whether custom attributes of a specified type are applied to a specified member.(Defined by CustomAttributeExtensions.) |
Get an instance of FieldBuilder by calling DefineField, DefineInitializedData, or DefineUninitializedData.
The following code sample illustrates the use of FieldBuilder.
Imports System Imports System.Threading Imports System.Reflection Imports System.Reflection.Emit Imports System.Security.Permissions Public Class FieldBuilder_Sample Private Shared Function CreateType(currentDomain As AppDomain) As Type ' Create an assembly. Dim myAssemblyName As New AssemblyName() myAssemblyName.Name = "DynamicAssembly" Dim myAssembly As AssemblyBuilder = currentDomain.DefineDynamicAssembly(myAssemblyName, _ AssemblyBuilderAccess.Run) ' Create a dynamic module in Dynamic Assembly. Dim myModuleBuilder As ModuleBuilder = myAssembly.DefineDynamicModule("MyModule") ' Define a public class named "MyClass" in the assembly. Dim myTypeBuilder As TypeBuilder = myModuleBuilder.DefineType("MyClass", _ TypeAttributes.Public) ' Define a private String field named "MyField" in the type. Dim myFieldBuilder As FieldBuilder = myTypeBuilder.DefineField("MyField", _ GetType(String), FieldAttributes.Private Or FieldAttributes.Static) ' Create the constructor. Dim constructorArgs As Type() = {GetType(String)} Dim constructor As ConstructorBuilder = _ myTypeBuilder.DefineConstructor(MethodAttributes.Public, _ CallingConventions.Standard, constructorArgs) Dim constructorIL As ILGenerator = constructor.GetILGenerator() constructorIL.Emit(OpCodes.Ldarg_0) Dim superConstructor As ConstructorInfo = GetType(Object).GetConstructor(New Type() {}) constructorIL.Emit(OpCodes.Call, superConstructor) constructorIL.Emit(OpCodes.Ldarg_0) constructorIL.Emit(OpCodes.Ldarg_1) constructorIL.Emit(OpCodes.Stfld, myFieldBuilder) constructorIL.Emit(OpCodes.Ret) ' Create the MyMethod method. Dim myMethodBuilder As MethodBuilder = myTypeBuilder.DefineMethod("MyMethod", _ MethodAttributes.Public, GetType(String), Nothing) Dim methodIL As ILGenerator = myMethodBuilder.GetILGenerator() methodIL.Emit(OpCodes.Ldarg_0) methodIL.Emit(OpCodes.Ldfld, myFieldBuilder) methodIL.Emit(OpCodes.Ret) Console.WriteLine("Name :" + myFieldBuilder.Name) Console.WriteLine("DeclaringType :" + myFieldBuilder.DeclaringType.ToString()) Console.WriteLine("Type :" + myFieldBuilder.FieldType.ToString()) Console.WriteLine("Token :" + myFieldBuilder.GetToken().Token.ToString()) Return myTypeBuilder.CreateType() End Function 'CreateType <PermissionSetAttribute(SecurityAction.Demand, Name:="FullTrust")> _ Public Shared Sub Main() Try Dim myType As Type = CreateType(Thread.GetDomain()) ' Create an instance of the "HelloWorld" class. Dim helloWorld As Object = Activator.CreateInstance(myType, New Object() {"HelloWorld"}) ' Invoke the "MyMethod" method of the "MyClass" class. Dim myObject As Object = myType.InvokeMember("MyMethod", _ BindingFlags.InvokeMethod, Nothing, helloWorld, Nothing) Console.WriteLine("MyClass.MyMethod returned: " & Microsoft.VisualBasic.Chr(34) & myObject & Microsoft.VisualBasic.Chr(34) ) Catch e as Exception Console.WriteLine("Exception Caught "+e.Message) End Try End Sub 'Main End Class 'FieldBuilder_Sample
Available since 1.1
Silverlight
Available since 2.0
Any public static ( Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.




