FieldBuilder Class
Defines and represents a field. This class cannot be inherited.
System.Reflection::MemberInfo
System.Reflection::FieldInfo
System.Reflection.Emit::FieldBuilder
Assembly: mscorlib (in mscorlib.dll)
The FieldBuilder type exposes the following members.
| Name | Description | |
|---|---|---|
![]() | Attributes | Indicates the attributes of this field. This property is read-only. (Overrides FieldInfo::Attributes.) |
![]() | 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 | Returns a value that indicates whether this instance is equal to a specified object. (Inherited from FieldInfo.) |
![]() | Finalize | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.) |
![]() | 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 | Gets the Type of the current instance. (Inherited from Object.) |
![]() | GetValue | Retrieves the value of the field supported by the given object. (Overrides FieldInfo::GetValue(Object).) |
![]() | GetValueDirect | Returns the value of a field supported by a given object. (Inherited from FieldInfo.) |
![]() | IsDefined | Indicates whether an attribute having the specified type is defined on a field. (Overrides MemberInfo::IsDefined(Type, Boolean).) |
![]() | MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
![]() | SetConstant | Sets the default value of this field. |
![]() | SetCustomAttribute(CustomAttributeBuilder) | Sets a custom attribute using a custom attribute builder. |
![]() | SetCustomAttribute(ConstructorInfo, array<Byte>) | Sets a custom attribute using a specified custom attribute blob. |
![]() | SetMarshal | Obsolete. Describes the native marshaling of the field. |
![]() | SetOffset | 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 | 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 | Maps a set of names to a corresponding set of dispatch identifiers. |
![]() ![]() | _FieldBuilder::GetTypeInfo | Retrieves the type information for an object, which can then be used to get the type information for an interface. |
![]() ![]() | _FieldBuilder::GetTypeInfoCount | Retrieves the number of type information interfaces that an object provides (either 0 or 1). |
![]() ![]() | _FieldBuilder::Invoke | Provides access to properties and methods exposed by an object. |
![]() ![]() | _FieldInfo::GetIDsOfNames | Maps a set of names to a corresponding set of dispatch identifiers. (Inherited from FieldInfo.) |
![]() ![]() | _FieldInfo::GetType | Gets a Type object representing the FieldInfo type. (Inherited from FieldInfo.) |
![]() ![]() | _FieldInfo::GetTypeInfo | 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 | Retrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from FieldInfo.) |
![]() ![]() | _FieldInfo::Invoke | Provides access to properties and methods exposed by an object. (Inherited from FieldInfo.) |
![]() ![]() | _MemberInfo::GetIDsOfNames | 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 | 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 | Retrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from MemberInfo.) |
![]() ![]() | _MemberInfo::Invoke | Provides access to properties and methods exposed by an object. (Inherited from MemberInfo.) |
Get an instance of FieldBuilder by calling DefineField, DefineInitializedData, or DefineUninitializedData.
Note |
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The SetValue method is currently not supported. As a workaround, retrieve the FieldInfo by reflecting on the finished type and call SetValue to set the value of the field. |
Note |
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The HostProtectionAttribute attribute applied to this type or member has the following Resources property value: MayLeakOnAbort. The HostProtectionAttribute does not affect desktop applications (which are typically started by double-clicking an icon, typing a command, or entering a URL in a browser). For more information, see the HostProtectionAttribute class or SQL Server Programming and Host Protection Attributes. |
The following code sample illustrates the use of FieldBuilder.
using namespace System; using namespace System::Threading; using namespace System::Reflection; using namespace System::Reflection::Emit; Type^ CreateType( AppDomain^ currentDomain ) { // Create an assembly. AssemblyName^ myAssemblyName = gcnew AssemblyName; myAssemblyName->Name = "DynamicAssembly"; AssemblyBuilder^ myAssembly = currentDomain->DefineDynamicAssembly( myAssemblyName, AssemblyBuilderAccess::Run ); // Create a dynamic module in Dynamic Assembly. ModuleBuilder^ myModuleBuilder = myAssembly->DefineDynamicModule( "MyModule" ); // Define a public class named S"MyClass" in the assembly. TypeBuilder^ myTypeBuilder = myModuleBuilder->DefineType( "MyClass", TypeAttributes::Public ); // Define a private String field named S"MyField" in the type. FieldBuilder^ myFieldBuilder = myTypeBuilder->DefineField( "MyField", String::typeid, static_cast<FieldAttributes>(FieldAttributes::Private | FieldAttributes::Static) ); // Create the constructor. array<Type^>^constructorArgs = {String::typeid}; ConstructorBuilder^ constructor = myTypeBuilder->DefineConstructor( MethodAttributes::Public, CallingConventions::Standard, constructorArgs ); ILGenerator^ constructorIL = constructor->GetILGenerator(); constructorIL->Emit( OpCodes::Ldarg_0 ); ConstructorInfo^ superConstructor = Object::typeid->GetConstructor( gcnew array<Type^>(0) ); 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. MethodBuilder^ myMethodBuilder = myTypeBuilder->DefineMethod( "MyMethod", MethodAttributes::Public, String::typeid, nullptr ); ILGenerator^ methodIL = myMethodBuilder->GetILGenerator(); methodIL->Emit( OpCodes::Ldarg_0 ); methodIL->Emit( OpCodes::Ldfld, myFieldBuilder ); methodIL->Emit( OpCodes::Ret ); Console::WriteLine( "Name : {0}", myFieldBuilder->Name ); Console::WriteLine( "DeclaringType : {0}", myFieldBuilder->DeclaringType ); Console::WriteLine( "Type : {0}", myFieldBuilder->FieldType ); Console::WriteLine( "Token : {0}", myFieldBuilder->GetToken().Token ); return myTypeBuilder->CreateType(); } int main() { try { Type^ myType = CreateType( Thread::GetDomain() ); // Create an instance of the S"HelloWorld" class. array<Object^>^type = {"HelloWorld"}; Object^ helloWorld = Activator::CreateInstance( myType, type ); // Invoke the S"MyMethod" method of the S"MyClass" class. Object^ myObject = myType->InvokeMember( "MyMethod", BindingFlags::InvokeMethod, nullptr, helloWorld, nullptr ); Console::WriteLine( "MyClass::MyMethod returned: \"{0}\"", myObject ); } catch ( Exception^ e ) { Console::WriteLine( "Exception Caught {0}", e->Message ); } }
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
