ILGenerator.BeginFinallyBlock Methode

Referenz

Definition

Namespace:: System.Reflection.Emit

Assembly:: System.Reflection.Emit.ILGeneration.dll

Assembly:: mscorlib.dll

Assembly:: netstandard.dll

Paket:: System.Reflection.Emit.ILGeneration v4.7.0

Quelle:: ILGenerator.cs

Quelle:: ILGenerator.cs

Quelle:: ILGenerator.cs

Wichtig

Einige Informationen beziehen sich auf Vorabversionen, die vor dem Release ggf. grundlegend überarbeitet werden. Microsoft übernimmt hinsichtlich der hier bereitgestellten Informationen keine Gewährleistungen, seien sie ausdrücklich oder konkludent.

Beginnt einen finally-Block im MSIL-Anweisungsstream (Microsoft Intermediate Language).

public:
 virtual void BeginFinallyBlock();

public:
 abstract void BeginFinallyBlock();

public virtual void BeginFinallyBlock ();

public abstract void BeginFinallyBlock ();

abstract member BeginFinallyBlock : unit -> unit
override this.BeginFinallyBlock : unit -> unit

abstract member BeginFinallyBlock : unit -> unit

Public Overridable Sub BeginFinallyBlock ()

Public MustOverride Sub BeginFinallyBlock ()

Ausnahmen

NotSupportedException

Die generierte MSIL befindet sich derzeit nicht in einem Ausnahmeblock.

Beispiele

Im folgenden Codebeispiel wird die Verwendung von BeginFinallyBlockveranschaulicht.

using namespace System;
using namespace System::Threading;
using namespace System::Reflection;
using namespace System::Reflection::Emit;

public ref class ILGenerator_BeginFinallyBlock
{
public:
   static Type^ AddType()
   {
      // Create an assembly.
      AssemblyName^ myAssemblyName = gcnew AssemblyName;
      myAssemblyName->Name = "AdderExceptionAsm";

      // Create dynamic assembly.
      AppDomain^ myAppDomain = Thread::GetDomain();
      AssemblyBuilder^ myAssemblyBuilder = myAppDomain->DefineDynamicAssembly( myAssemblyName, AssemblyBuilderAccess::Run );

      // Create a dynamic module.
      ModuleBuilder^ myModuleBuilder = myAssemblyBuilder->DefineDynamicModule( "AdderExceptionMod" );
      TypeBuilder^ myTypeBuilder = myModuleBuilder->DefineType( "Adder" );
      array<Type^>^adderParams = {int::typeid,int::typeid};

      // Define method to add two numbers.
      MethodBuilder^ myMethodBuilder = myTypeBuilder->DefineMethod( "DoAdd", static_cast<MethodAttributes>(MethodAttributes::Public | MethodAttributes::Static), int::typeid, adderParams );
      ILGenerator^ myAdderIL = myMethodBuilder->GetILGenerator();

      // Create constructor.
      array<Type^>^type1 = {String::typeid};
      ConstructorInfo^ myConstructorInfo = OverflowException::typeid->GetConstructor( type1 );
      MethodInfo^ myExToStrMI = OverflowException::typeid->GetMethod( "ToString" );
      array<Type^>^type2 = {String::typeid,Object::typeid};
      MethodInfo^ myWriteLineMI = Console::typeid->GetMethod( "WriteLine", type2 );

      // Declare local variable.
      LocalBuilder^ myLocalBuilder1 = myAdderIL->DeclareLocal( int::typeid );
      LocalBuilder^ myLocalBuilder2 = myAdderIL->DeclareLocal( OverflowException::typeid );

      // Define label.
      Label myFailedLabel = myAdderIL->DefineLabel();
      Label myEndOfMethodLabel = myAdderIL->DefineLabel();

      // Begin exception block.
      Label myLabel = myAdderIL->BeginExceptionBlock();
      myAdderIL->Emit( OpCodes::Ldarg_0 );
      myAdderIL->Emit( OpCodes::Ldc_I4_S, 10 );
      myAdderIL->Emit( OpCodes::Bgt_S, myFailedLabel );
      myAdderIL->Emit( OpCodes::Ldarg_1 );
      myAdderIL->Emit( OpCodes::Ldc_I4_S, 10 );
      myAdderIL->Emit( OpCodes::Bgt_S, myFailedLabel );
      myAdderIL->Emit( OpCodes::Ldarg_0 );
      myAdderIL->Emit( OpCodes::Ldarg_1 );
      myAdderIL->Emit( OpCodes::Add_Ovf_Un );
      myAdderIL->Emit( OpCodes::Stloc_S, myLocalBuilder1 );
      myAdderIL->Emit( OpCodes::Br_S, myEndOfMethodLabel );
      myAdderIL->MarkLabel( myFailedLabel );
      myAdderIL->Emit( OpCodes::Ldstr, "Cannot accept values over 10 for add." );
      myAdderIL->Emit( OpCodes::Newobj, myConstructorInfo );
      myAdderIL->Emit( OpCodes::Stloc_S, myLocalBuilder2 );
      myAdderIL->Emit( OpCodes::Ldloc_S, myLocalBuilder2 );

      // Throw the exception.
      myAdderIL->ThrowException( OverflowException::typeid );

      // Call 'BeginExceptFilterBlock'.
      myAdderIL->BeginExceptFilterBlock();
      myAdderIL->EmitWriteLine( "Except filter block called." );

      // Call catch block.
      myAdderIL->BeginCatchBlock( nullptr );

      // Call other catch block.
      myAdderIL->BeginCatchBlock( OverflowException::typeid );
      myAdderIL->Emit( OpCodes::Ldstr, "{0}" );
      myAdderIL->Emit( OpCodes::Ldloc_S, myLocalBuilder2 );
      myAdderIL->EmitCall( OpCodes::Callvirt, myExToStrMI, nullptr );
      myAdderIL->EmitCall( OpCodes::Call, myWriteLineMI, nullptr );
      myAdderIL->Emit( OpCodes::Ldc_I4_M1 );
      myAdderIL->Emit( OpCodes::Stloc_S, myLocalBuilder1 );

      // Call finally block.
      myAdderIL->BeginFinallyBlock();
      myAdderIL->EmitWriteLine( "Finally block called." );

      // End the exception block.
      myAdderIL->EndExceptionBlock();
      myAdderIL->MarkLabel( myEndOfMethodLabel );
      myAdderIL->Emit( OpCodes::Ldloc_S, myLocalBuilder1 );
      myAdderIL->Emit( OpCodes::Ret );
      return myTypeBuilder->CreateType();
   }
};

int main()
{
   Type^ myAddType = ILGenerator_BeginFinallyBlock::AddType();
   Object^ myObject1 = Activator::CreateInstance( myAddType );
   array<Object^>^myObject2 = {15,15};
   myAddType->InvokeMember( "DoAdd", BindingFlags::InvokeMethod, nullptr, myObject1, myObject2 );
}

using System;
using System.Threading;
using System.Reflection;
using System.Reflection.Emit;
using System.Security.Permissions;

public class ILGenerator_BeginFinallyBlock
{
   public static Type AddType()
   {
      // Create an assembly.
      AssemblyName myAssemblyName = new AssemblyName();
      myAssemblyName.Name = "AdderExceptionAsm";

      // Create dynamic assembly.
      AppDomain myAppDomain = Thread.GetDomain();
      AssemblyBuilder myAssemblyBuilder = myAppDomain.DefineDynamicAssembly(myAssemblyName,
         AssemblyBuilderAccess.Run);

      // Create a dynamic module.
      ModuleBuilder myModuleBuilder = myAssemblyBuilder.DefineDynamicModule("AdderExceptionMod");
      TypeBuilder myTypeBuilder = myModuleBuilder.DefineType("Adder");
      Type[] adderParams = new Type[] {typeof(int), typeof(int)};

      // Define method to add two numbers.
      MethodBuilder myMethodBuilder = myTypeBuilder.DefineMethod("DoAdd",MethodAttributes.Public |
         MethodAttributes.Static,typeof(int),adderParams);
      ILGenerator myAdderIL = myMethodBuilder.GetILGenerator();

      // Create constructor.
      ConstructorInfo myConstructorInfo = typeof(OverflowException).GetConstructor(
         new Type[]{typeof(string)});
      MethodInfo myExToStrMI = typeof(OverflowException).GetMethod("ToString");
      MethodInfo myWriteLineMI = typeof(Console).GetMethod("WriteLine",new Type[]
         {typeof(string),typeof(object)});

      // Declare local variable.
      LocalBuilder myLocalBuilder1 = myAdderIL.DeclareLocal(typeof(int));
      LocalBuilder myLocalBuilder2 = myAdderIL.DeclareLocal(typeof(OverflowException));

      // Define label.
      Label myFailedLabel = myAdderIL.DefineLabel();
      Label myEndOfMethodLabel = myAdderIL.DefineLabel();

      // Begin exception block.
      Label myLabel = myAdderIL.BeginExceptionBlock();

      myAdderIL.Emit(OpCodes.Ldarg_0);
      myAdderIL.Emit(OpCodes.Ldc_I4_S, 10);
      myAdderIL.Emit(OpCodes.Bgt_S, myFailedLabel);

      myAdderIL.Emit(OpCodes.Ldarg_1);
      myAdderIL.Emit(OpCodes.Ldc_I4_S, 10);
      myAdderIL.Emit(OpCodes.Bgt_S, myFailedLabel);

      myAdderIL.Emit(OpCodes.Ldarg_0);
      myAdderIL.Emit(OpCodes.Ldarg_1);
      myAdderIL.Emit(OpCodes.Add_Ovf_Un);
      myAdderIL.Emit(OpCodes.Stloc_S, myLocalBuilder1);
      myAdderIL.Emit(OpCodes.Br_S, myEndOfMethodLabel);

      myAdderIL.MarkLabel(myFailedLabel);
      myAdderIL.Emit(OpCodes.Ldstr, "Cannot accept values over 10 for add.");
      myAdderIL.Emit(OpCodes.Newobj, myConstructorInfo);

      myAdderIL.Emit(OpCodes.Stloc_S, myLocalBuilder2);
      myAdderIL.Emit(OpCodes.Ldloc_S, myLocalBuilder2);

      // Throw the exception.
      myAdderIL.ThrowException(typeof(OverflowException));

      // Call 'BeginExceptFilterBlock'.
      myAdderIL.BeginExceptFilterBlock();
      myAdderIL.EmitWriteLine("Except filter block called.");

      // Call catch block.
      myAdderIL.BeginCatchBlock(null);

      // Call other catch block.
      myAdderIL.BeginCatchBlock(typeof(OverflowException));

      myAdderIL.Emit(OpCodes.Ldstr, "{0}");
      myAdderIL.Emit(OpCodes.Ldloc_S, myLocalBuilder2);
      myAdderIL.EmitCall(OpCodes.Callvirt, myExToStrMI, null);
      myAdderIL.EmitCall(OpCodes.Call, myWriteLineMI, null);
      myAdderIL.Emit(OpCodes.Ldc_I4_M1);
      myAdderIL.Emit(OpCodes.Stloc_S, myLocalBuilder1);

      // Call finally block.
      myAdderIL.BeginFinallyBlock();
      myAdderIL.EmitWriteLine("Finally block called.");

      // End the exception block.
      myAdderIL.EndExceptionBlock();

      myAdderIL.MarkLabel(myEndOfMethodLabel);
      myAdderIL.Emit(OpCodes.Ldloc_S, myLocalBuilder1);
      myAdderIL.Emit(OpCodes.Ret);

      return myTypeBuilder.CreateType();
   }
   
   public static void Main()
   {
      Type myAddType = AddType();
      object myObject1 = Activator.CreateInstance(myAddType);
      object[] myObject2 = new object[]{15,15};
      myAddType.InvokeMember("DoAdd", BindingFlags.InvokeMethod,
         null, myObject1, myObject2);
   }
}

Imports System.Threading
Imports System.Reflection
Imports System.Reflection.Emit
Imports System.Security.Permissions

Public Class ILGenerator_BeginFinallyBlock
   Public Shared Function AddType() As Type
      ' Create an assembly.
      Dim myAssemblyName As New AssemblyName()
      myAssemblyName.Name = "AdderExceptionAsm"

      ' Create dynamic assembly.
      Dim myAppDomain As AppDomain = Thread.GetDomain()
      Dim myAssemblyBuilder As AssemblyBuilder = _
            myAppDomain.DefineDynamicAssembly(myAssemblyName, AssemblyBuilderAccess.Run)

      ' Create a dynamic module.
      Dim myModuleBuilder As ModuleBuilder = _
            myAssemblyBuilder.DefineDynamicModule("AdderExceptionMod")
      Dim myTypeBuilder As TypeBuilder = myModuleBuilder.DefineType("Adder")
      Dim adderParams() As Type = {GetType(Integer), GetType(Integer)}

      ' Define method to add two numbers.
      Dim myMethodBuilder As MethodBuilder = _
            myTypeBuilder.DefineMethod("DoAdd", MethodAttributes.Public Or _
            MethodAttributes.Static, GetType(Integer), adderParams)
      Dim myAdderIL As ILGenerator = myMethodBuilder.GetILGenerator()

      ' Create constructor.
      Dim myConstructorInfo As ConstructorInfo = _
            GetType(OverflowException).GetConstructor(New Type() {GetType(String)})
      Dim myExToStrMI As MethodInfo = GetType(OverflowException).GetMethod("ToString")
      Dim myWriteLineMI As MethodInfo = _
            GetType(Console).GetMethod("WriteLine", New Type() {GetType(String), GetType(Object)})

      ' Declare local variable.
      Dim myLocalBuilder1 As LocalBuilder = myAdderIL.DeclareLocal(GetType(Integer))
      Dim myLocalBuilder2 As LocalBuilder = myAdderIL.DeclareLocal(GetType(OverflowException))

      ' Define label.
      Dim myFailedLabel As Label = myAdderIL.DefineLabel()
      Dim myEndOfMethodLabel As Label = myAdderIL.DefineLabel()

      ' Begin exception block.
      Dim myLabel As Label = myAdderIL.BeginExceptionBlock()

      myAdderIL.Emit(OpCodes.Ldarg_0)
      myAdderIL.Emit(OpCodes.Ldc_I4_S, 10)
      myAdderIL.Emit(OpCodes.Bgt_S, myFailedLabel)

      myAdderIL.Emit(OpCodes.Ldarg_1)
      myAdderIL.Emit(OpCodes.Ldc_I4_S, 10)
      myAdderIL.Emit(OpCodes.Bgt_S, myFailedLabel)

      myAdderIL.Emit(OpCodes.Ldarg_0)
      myAdderIL.Emit(OpCodes.Ldarg_1)
      myAdderIL.Emit(OpCodes.Add_Ovf_Un)
      myAdderIL.Emit(OpCodes.Stloc_S, myLocalBuilder1)
      myAdderIL.Emit(OpCodes.Br_S, myEndOfMethodLabel)

      myAdderIL.MarkLabel(myFailedLabel)
      myAdderIL.Emit(OpCodes.Ldstr, "Cannot accept values over 10 for add.")
      myAdderIL.Emit(OpCodes.Newobj, myConstructorInfo)

      myAdderIL.Emit(OpCodes.Stloc_S, myLocalBuilder2)
      myAdderIL.Emit(OpCodes.Ldloc_S, myLocalBuilder2)

      ' Throw the exception.
      myAdderIL.ThrowException(GetType(OverflowException))

      ' Call 'BeginExceptFilterBlock'.
      myAdderIL.BeginExceptFilterBlock()
      myAdderIL.EmitWriteLine("Except filter block called.")

      ' Call catch block.
      myAdderIL.BeginCatchBlock(Nothing)

      ' Call other catch block.
      myAdderIL.BeginCatchBlock(GetType(OverflowException))

      myAdderIL.Emit(OpCodes.Ldstr, "{0}")
      myAdderIL.Emit(OpCodes.Ldloc_S, myLocalBuilder2)
      myAdderIL.EmitCall(OpCodes.Callvirt, myExToStrMI, Nothing)
      myAdderIL.EmitCall(OpCodes.Call, myWriteLineMI, Nothing)
      myAdderIL.Emit(OpCodes.Ldc_I4_M1)
      myAdderIL.Emit(OpCodes.Stloc_S, myLocalBuilder1)

      ' Call finally block.
      myAdderIL.BeginFinallyBlock()
      myAdderIL.EmitWriteLine("Finally block called.")

      ' End the exception block.
      myAdderIL.EndExceptionBlock()

      myAdderIL.MarkLabel(myEndOfMethodLabel)
      myAdderIL.Emit(OpCodes.Ldloc_S, myLocalBuilder1)
      myAdderIL.Emit(OpCodes.Ret)

      Return myTypeBuilder.CreateType()
   End Function 'AddType

   <PermissionSetAttribute(SecurityAction.Demand, Name:="FullTrust")> _
   Public Shared Sub Main()
      Dim myAddType As Type = AddType()
      Dim myObject1 As Object = Activator.CreateInstance(myAddType)
      Dim myObject2() As Object = {15, 15}
      myAddType.InvokeMember("DoAdd", BindingFlags.InvokeMethod, Nothing, myObject1, myObject2)
   End Sub
End Class

Gilt für:

Freigeben über

ILGenerator.BeginFinallyBlock Methode

Definition

Ausnahmen

Beispiele

Gilt für:

Zusätzliche Ressourcen