FieldBuilder Class

Defines and represents a field. This class cannot be inherited.

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

public ref class FieldBuilder sealed : public FieldInfo, _FieldBuilder
/** @attribute ClassInterfaceAttribute(ClassInterfaceType.None) */ 
/** @attribute ComVisibleAttribute(true) */ 
public final class FieldBuilder extends FieldInfo implements _FieldBuilder
public final class FieldBuilder extends FieldInfo implements _FieldBuilder
Not applicable.

Get an instance of FieldBuilder by calling DefineField, DefineInitializedData, or DefineUninitializedData.


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.

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()
      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 );


Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0