ILGenerator.BeginFaultBlock メソッドとは何？わかりやすく解説 Weblio辞書

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ILGenerator.BeginFaultBlock メソッド

MSIL (Microsoft Intermediate Language) ストリームで例外フォールトブロックを開始します。

名前空間: System.Reflection.Emit
アセンブリ: mscorlib (mscorlib.dll 内)
構文

Visual Basic (宣言)

Public Overridable Sub BeginFaultBlock

Visual Basic (使用法)

Dim instance As ILGenerator

instance.BeginFaultBlock

public virtual void BeginFaultBlock ()

C++

public:
virtual void BeginFaultBlock ()

public void BeginFaultBlock ()

JScript

public function BeginFaultBlock ()

例外

例外の種類	条件
NotSupportedException	生成されている MSIL (Microsoft intermediate language) は、現在例外ブロックに含まれていません。

使用例

BeginFaultBlock の使用方法については、次のコード例を参照してください。

Visual Basic

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

Public Class ILGenerator_BeginFaultBlock
   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 myAdderParams() As Type = {GetType(Integer),
 GetType(Integer)}
      
      ' Method to add two numbers.
      Dim myMethodBuilder As MethodBuilder
 = myTypeBuilder.DefineMethod _ 
               ("DoAdd", MethodAttributes.Public Or
 MethodAttributes.Static, GetType(Integer),
 _
                                                  myAdderParams)
      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 addition.")
      myAdderIL.Emit(OpCodes.Newobj, myConstructorInfo)
      
      myAdderIL.Emit(OpCodes.Stloc_S, myLocalBuilder2)
      myAdderIL.Emit(OpCodes.Ldloc_S, myLocalBuilder2)
      
      ' Call fault block.
      myAdderIL.BeginFaultBlock()
      Console.WriteLine("Fault block called.")
      'Throw exception.
      myAdderIL.ThrowException(GetType(NotSupportedException))
      
      ' Call finally block.
      myAdderIL.BeginFinallyBlock()
      
      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)
      
      ' End 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
 = {11, 12}
      
      ' Invoke member.
      myAddType.InvokeMember("DoAdd", BindingFlags.InvokeMethod,
 Nothing, myObject1, myObject2)
   End Sub 'Main
End Class 'ILGenerator_BeginFaultBlock

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

public class ILGenerator_BeginFaultBlock
{
   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[] myAdderParams = new Type[] {typeof(int),
 typeof(int)};

      // Method to add two numbers.
      MethodBuilder myMethodBuilder = myTypeBuilder.DefineMethod("DoAdd",MethodAttributes.Public
 |
         MethodAttributes.Static,typeof(int),myAdderParams);
      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
 addition.");
      myAdderIL.Emit(OpCodes.Newobj, myConstructorInfo);

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

      // Call fault block.
      myAdderIL.BeginFaultBlock();
      Console.WriteLine("Fault block called.");
      //Throw exception.
      myAdderIL.ThrowException(typeof(NotSupportedException));

      // Call finally block.
      myAdderIL.BeginFinallyBlock();
      
      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);

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

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

      return myTypeBuilder.CreateType();
   }
   [PermissionSetAttribute(SecurityAction.Demand, Name="FullTrust")]
   public static void Main()
   {
      Type myAddType = AddType();
      object myObject1 = Activator.CreateInstance(myAddType);
      object[] myObject2 = new object[]{11,12};
      
      // Invoke member.
      myAddType.InvokeMember("DoAdd",BindingFlags.InvokeMethod,null
,myObject1,myObject2);
   }
}

C++

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

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^>^myAdderParams = {int::typeid,int::typeid};

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

   // Create constructor.
   array<Type^>^temp0 = {String::typeid};
   ConstructorInfo^ myConstructorInfo = OverflowException::typeid->GetConstructor(
 temp0 );
   MethodInfo^ myExToStrMI = OverflowException::typeid->GetMethod( "ToString"
 );
   array<Type^>^temp1 = {String::typeid,Object::typeid};
   MethodInfo^ myWriteLineMI = Console::typeid->GetMethod( "WriteLine",
 temp1 );

   // 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
 addition." );
   myAdderIL->Emit( OpCodes::Newobj, myConstructorInfo );
   myAdderIL->Emit( OpCodes::Stloc_S, myLocalBuilder2 );
   myAdderIL->Emit( OpCodes::Ldloc_S, myLocalBuilder2 );

   // Call fault block.
   myAdderIL->BeginFaultBlock();
   Console::WriteLine( "Fault block called." );

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

   // Call finally block.
   myAdderIL->BeginFinallyBlock();
   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 );

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

int main()
{
   Type^ myAddType = AddType();
   Object^ myObject1 = Activator::CreateInstance( myAddType );
   array<Object^>^myObject2 = {11,12};

   // Invoke member.
   myAddType->InvokeMember( "DoAdd", BindingFlags::InvokeMethod, nullptr,
 myObject1, myObject2 );
}

import System.*;
import System.Threading.*;
import System.Reflection.*;
import System.Reflection.Emit.*;

public class ILGenerator_BeginFaultBlock
{
    public static Type AddType()
    {
        // Create an assembly.
        AssemblyName myAssemblyName = new AssemblyName();
        myAssemblyName.set_Name("AdderExceptionAsm");
        // Create dynamic assembly.
        AppDomain myAppDomain = System.Threading.Thread.GetDomain();
        AssemblyBuilder myAssemblyBuilder = myAppDomain.DefineDynamicAssembly(
            myAssemblyName, AssemblyBuilderAccess.Run);

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

        // Method to add two numbers.
        MethodBuilder myMethodBuilder = myTypeBuilder.DefineMethod("DoAdd"
,
            MethodAttributes.Public | MethodAttributes.Static,
            int.class.ToType(), myAdderParams);
        ILGenerator myAdderIL = myMethodBuilder.GetILGenerator();

        // Create constructor.
        ConstructorInfo myConstructorInfo = OverflowException.class.ToType().
            GetConstructor(new Type[] { String.class.ToType()
 });
        MethodInfo myExToStrMI = OverflowException.class.ToType().
            GetMethod("ToString");
        MethodInfo myWriteLineMI = Console.class.ToType().
            GetMethod("WriteLine", new Type[] { String.class.ToType(),
 
            Object.class.ToType() });

        // Declare local variable.
        LocalBuilder myLocalBuilder1 = myAdderIL.DeclareLocal(int.
            class.ToType());
        LocalBuilder myLocalBuilder2 = myAdderIL.DeclareLocal(
            OverflowException.class.ToType());
        // 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 addition.");
        myAdderIL.Emit(OpCodes.Newobj, myConstructorInfo);
        myAdderIL.Emit(OpCodes.Stloc_S, myLocalBuilder2);
        myAdderIL.Emit(OpCodes.Ldloc_S, myLocalBuilder2);

        // Call fault block.
        myAdderIL.BeginFaultBlock();
        Console.WriteLine("Fault block called.");

        //Throw exception.
        myAdderIL.ThrowException(NotSupportedException.class.ToType());

        // Call finally block.
        myAdderIL.BeginFinallyBlock();
        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);

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

    public static void main(String[]
 args)
    {
        Type myAddType = AddType();
        Object myObject1 = Activator.CreateInstance(myAddType);
        Object myObject2[] = new Object[] { (Int32) (11),(Int32)(12)
 };

        // Invoke member.
        myAddType.InvokeMember("DoAdd", BindingFlags.InvokeMethod, null
,
            myObject1, myObject2);
    } //main
} //ILGenerator_BeginFaultBlock

プラットフォーム

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0

参照

関連項目
ILGenerator クラス
ILGenerator メンバ
System.Reflection.Emit 名前空間

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ILGenerator.BeginFaultBlock メソッドとは？ わかりやすく解説

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ILGenerator.BeginFaultBlock メソッドとは？わかりやすく解説