TypeBuilder.DefineTypeInitializer Método

Definición

Espacio de nombres:

System.Reflection.Emit

Ensamblados:

netstandard.dll, System.Reflection.Emit.dll

Source:

TypeBuilder.cs

Define el inicializador para este tipo.

public:
 System::Reflection::Emit::ConstructorBuilder ^ DefineTypeInitializer();

public System.Reflection.Emit.ConstructorBuilder DefineTypeInitializer();

member this.DefineTypeInitializer : unit -> System.Reflection.Emit.ConstructorBuilder

Public Function DefineTypeInitializer () As ConstructorBuilder

Devoluciones

ConstructorBuilder

Devuelve un inicializador de tipo.

Excepciones

InvalidOperationException

Tipo contenedor que se ha creado anteriormente mediante CreateType().

Ejemplos

En el ejemplo de código siguiente se muestra cómo crear un constructor de inicialización mediante DefineTypeInitializer.

public class MyApplication
{
   public static void Main()
   {
      // Create the "HelloWorld" class
      Type helloWorldType = CreateType();
      Console.WriteLine("Full Name : " + helloWorldType.FullName);
      Console.WriteLine("Static constructors:");
      ConstructorInfo[] info =
         helloWorldType.GetConstructors(BindingFlags.Static | BindingFlags.NonPublic);
      for(int index=0; index < info.Length; index++)
         Console.WriteLine(info[index].ToString());
      
      // Print value stored in the static field
      Console.WriteLine(helloWorldType.GetField("Greeting").GetValue(null)); 
      Activator.CreateInstance(helloWorldType);
   }

   // Create the dynamic type.
   private static Type CreateType()
   {
      AssemblyName myAssemblyName = new AssemblyName();
      myAssemblyName.Name = "EmittedAssembly";

      // Create the callee dynamic assembly.
      AssemblyBuilder myAssembly = AssemblyBuilder.DefineDynamicAssembly(myAssemblyName,
         AssemblyBuilderAccess.Run);
      // Create a dynamic module named "CalleeModule" in the callee assembly.
      ModuleBuilder myModule = myAssembly.DefineDynamicModule("EmittedModule");

      // Define a public class named "HelloWorld" in the assembly.
      TypeBuilder helloWorldClass = myModule.DefineType("HelloWorld", TypeAttributes.Public);
      // Define a public static string field named "Greeting" in the type.
      FieldBuilder greetingField = helloWorldClass.DefineField("Greeting", typeof(String),
         FieldAttributes.Static | FieldAttributes.Public);

      // Create the static constructor.
      ConstructorBuilder constructor = helloWorldClass.DefineTypeInitializer();

      // Generate IL for the method. 
      // The constructor stores its "Hello emit!" in the public field.
      ILGenerator constructorIL = constructor.GetILGenerator();

      constructorIL.Emit(OpCodes.Ldstr, "Hello emit!");
      constructorIL.Emit(OpCodes.Stsfld, greetingField);      
      constructorIL.Emit(OpCodes.Ret);

      return helloWorldClass.CreateType();
   }
}

Public Class MyApplication

   Public Shared Sub Main()
      ' Create the "HelloWorld" class
      Dim helloWorldClass As TypeBuilder = CreateCallee(Thread.GetDomain())
      Console.WriteLine("Full Name : " + helloWorldClass.FullName)
      Console.WriteLine("Constructors :")
      Dim info As ConstructorInfo() = helloWorldClass.GetConstructors(BindingFlags.Public Or _
                                                                     BindingFlags.Instance)
      Dim index As Integer
      For index = 0 To info.Length - 1
         Console.WriteLine(info(index).ToString())
      Next index
   End Sub

   ' Create the callee transient dynamic assembly.
   Private Shared Function CreateCallee(myDomain As AppDomain) As TypeBuilder
      Dim myAssemblyName As New AssemblyName()
      myAssemblyName.Name = "EmittedAssembly"

      ' Create the callee dynamic assembly.
      Dim myAssembly As AssemblyBuilder = myDomain.DefineDynamicAssembly(myAssemblyName, _
                                                               AssemblyBuilderAccess.Run)
      ' Create a dynamic module named "CalleeModule" in the callee assembly.
      Dim myModule As ModuleBuilder = myAssembly.DefineDynamicModule("EmittedModule")

      ' Define a public class named "HelloWorld" in the assembly.
      Dim helloWorldClass As TypeBuilder = myModule.DefineType("HelloWorld", TypeAttributes.Public)
      ' Define a private String field named "Greeting" in the type.
      Dim greetingField As FieldBuilder = helloWorldClass.DefineField("Greeting", GetType(String), _
                                                                     FieldAttributes.Private)

      ' Create the constructor.
      Dim constructor As ConstructorBuilder = helloWorldClass.DefineTypeInitializer()

      ' Generate IL for the method. The constructor calls its base class
      ' constructor. The constructor stores its argument in the private field.
      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, greetingField)
      constructorIL.Emit(OpCodes.Ret)

      helloWorldClass.CreateType()
      Return helloWorldClass
   End Function 'CreateCallee
End Class

Comentarios

El inicializador creado siempre es público.