ConstructorBuilder.GetILGenerator Metodo

Definizione

Spazio dei nomi:

System.Reflection.Emit

Assembly:

System.Reflection.Emit.dll

Ottiene un oggetto ILGenerator che può essere usato per creare il corpo di un metodo per questo costruttore.

Overload

GetILGenerator(Int32)	Ottiene un oggetto ILGenerator, con le dimensioni di flusso MSIL specificate, che può essere usato per compilare il corpo di un metodo per il costruttore.
GetILGenerator()	Ottiene un oggetto ILGenerator per il costruttore.

GetILGenerator(Int32)

Origine:

ConstructorBuilder.cs

Ottiene un oggetto ILGenerator, con le dimensioni di flusso MSIL specificate, che può essere usato per compilare il corpo di un metodo per il costruttore.

public:
 System::Reflection::Emit::ILGenerator ^ GetILGenerator(int streamSize);

public System.Reflection.Emit.ILGenerator GetILGenerator (int streamSize);

member this.GetILGenerator : int -> System.Reflection.Emit.ILGenerator

Public Function GetILGenerator (streamSize As Integer) As ILGenerator

Parametri

streamSize

Int32

Dimensioni del flusso MSIL in byte.

Restituisce

ILGenerator

Oggetto ILGenerator per il costruttore.

Eccezioni

InvalidOperationException

Il costruttore è un costruttore senza parametri.

-oppure-

Il costruttore ha il flag MethodAttributes o MethodImplAttributes, che indica che non deve avere un corpo del metodo.

Commenti

Il runtime genera il codice per i costruttori predefiniti. Pertanto, se viene effettuato un tentativo di ottenere un ILGenerator oggetto per un costruttore senza parametri, viene generata un'eccezione.

GetILGenerator()

Origine:

ConstructorBuilder.cs

Ottiene un oggetto ILGenerator per il costruttore.

public:
 System::Reflection::Emit::ILGenerator ^ GetILGenerator();

public System.Reflection.Emit.ILGenerator GetILGenerator ();

member this.GetILGenerator : unit -> System.Reflection.Emit.ILGenerator

Public Function GetILGenerator () As ILGenerator

Restituisce

ILGenerator

Oggetto ILGenerator per questo costruttore.

Eccezioni

InvalidOperationException

Il costruttore è un costruttore senza parametri.

-oppure-

Il costruttore ha il flag MethodAttributes o MethodImplAttributes, che indica che non deve avere un corpo del metodo.

Esempio

Nell'esempio di codice seguente viene illustrato l'uso del GetILGenerator metodo .

using namespace System;
using namespace System::Threading;
using namespace System::Reflection;
using namespace System::Reflection::Emit;
Type^ DynamicPointTypeGen()
{
   Type^ pointType = nullptr;
   array<Type^>^temp0 = {int::typeid,int::typeid,int::typeid};
   array<Type^>^ctorParams = temp0;
   AppDomain^ myDomain = Thread::GetDomain();
   AssemblyName^ myAsmName = gcnew AssemblyName;
   myAsmName->Name = "MyDynamicAssembly";
   AssemblyBuilder^ myAsmBuilder = myDomain->DefineDynamicAssembly( myAsmName, AssemblyBuilderAccess::RunAndSave );
   ModuleBuilder^ pointModule = myAsmBuilder->DefineDynamicModule( "PointModule", "Point.dll" );
   TypeBuilder^ pointTypeBld = pointModule->DefineType( "Point", TypeAttributes::Public );
   FieldBuilder^ xField = pointTypeBld->DefineField( "x", int::typeid, FieldAttributes::Public );
   FieldBuilder^ yField = pointTypeBld->DefineField( "y", int::typeid, FieldAttributes::Public );
   FieldBuilder^ zField = pointTypeBld->DefineField( "z", int::typeid, FieldAttributes::Public );
   Type^ objType = Type::GetType( "System.Object" );
   ConstructorInfo^ objCtor = objType->GetConstructor( gcnew array<Type^>(0) );
   ConstructorBuilder^ pointCtor = pointTypeBld->DefineConstructor( MethodAttributes::Public, CallingConventions::Standard, ctorParams );
   ILGenerator^ ctorIL = pointCtor->GetILGenerator();
   
   // NOTE: ldarg.0 holds the "this" reference - ldarg.1, ldarg.2, and ldarg.3
   // hold the actual passed parameters. ldarg.0 is used by instance methods
   // to hold a reference to the current calling bject instance. Static methods
   // do not use arg.0, since they are not instantiated and hence no reference
   // is needed to distinguish them.
   ctorIL->Emit( OpCodes::Ldarg_0 );
   
   // Here, we wish to create an instance of System::Object by invoking its
   // constructor, as specified above.
   ctorIL->Emit( OpCodes::Call, objCtor );
   
   // Now, we'll load the current instance in arg 0, along
   // with the value of parameter "x" stored in arg 1, into stfld.
   ctorIL->Emit( OpCodes::Ldarg_0 );
   ctorIL->Emit( OpCodes::Ldarg_1 );
   ctorIL->Emit( OpCodes::Stfld, xField );
   
   // Now, we store arg 2 "y" in the current instance with stfld.
   ctorIL->Emit( OpCodes::Ldarg_0 );
   ctorIL->Emit( OpCodes::Ldarg_2 );
   ctorIL->Emit( OpCodes::Stfld, yField );
   
   // Last of all, arg 3 "z" gets stored in the current instance.
   ctorIL->Emit( OpCodes::Ldarg_0 );
   ctorIL->Emit( OpCodes::Ldarg_3 );
   ctorIL->Emit( OpCodes::Stfld, zField );
   
   // Our work complete, we return.
   ctorIL->Emit( OpCodes::Ret );
   
   // Now, let's create three very simple methods so we can see our fields.
   array<String^>^temp1 = {"GetX","GetY","GetZ"};
   array<String^>^mthdNames = temp1;
   System::Collections::IEnumerator^ myEnum = mthdNames->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      String^ mthdName = safe_cast<String^>(myEnum->Current);
      MethodBuilder^ getFieldMthd = pointTypeBld->DefineMethod( mthdName, MethodAttributes::Public, int::typeid, nullptr );
      ILGenerator^ mthdIL = getFieldMthd->GetILGenerator();
      mthdIL->Emit( OpCodes::Ldarg_0 );
      if ( mthdName->Equals( "GetX" ) )
            mthdIL->Emit( OpCodes::Ldfld, xField );
      else
      if ( mthdName->Equals( "GetY" ) )
            mthdIL->Emit( OpCodes::Ldfld, yField );
      else
      if ( mthdName->Equals( "GetZ" ) )
            mthdIL->Emit( OpCodes::Ldfld, zField );



      mthdIL->Emit( OpCodes::Ret );
   }

   pointType = pointTypeBld->CreateType();
   
   // Let's save it, just for posterity.
   myAsmBuilder->Save( "Point.dll" );
   return pointType;
}

int main()
{
   Type^ myDynamicType = nullptr;
   Object^ aPoint = nullptr;
   array<Type^>^temp2 = {int::typeid,int::typeid,int::typeid};
   array<Type^>^aPtypes = temp2;
   array<Object^>^temp3 = {4,5,6};
   array<Object^>^aPargs = temp3;
   
   // Call the  method to build our dynamic class.
   myDynamicType = DynamicPointTypeGen();
   Console::WriteLine( "Some information about my new Type '{0}':", myDynamicType->FullName );
   Console::WriteLine( "Assembly: '{0}'", myDynamicType->Assembly );
   Console::WriteLine( "Attributes: '{0}'", myDynamicType->Attributes );
   Console::WriteLine( "Module: '{0}'", myDynamicType->Module );
   Console::WriteLine( "Members: " );
   System::Collections::IEnumerator^ myEnum = myDynamicType->GetMembers()->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      MemberInfo^ member = safe_cast<MemberInfo^>(myEnum->Current);
      Console::WriteLine( "-- {0} {1};", member->MemberType, member->Name );
   }

   Console::WriteLine( "---" );
   
   // Let's take a look at the constructor we created.
   ConstructorInfo^ myDTctor = myDynamicType->GetConstructor( aPtypes );
   Console::WriteLine( "Constructor: {0};", myDTctor );
   Console::WriteLine( "---" );
   
   // Now, we get to use our dynamically-created class by invoking the constructor.
   aPoint = myDTctor->Invoke( aPargs );
   Console::WriteLine( "aPoint is type {0}.", aPoint->GetType() );
   
   // Finally, let's reflect on the instance of our new type - aPoint - and
   // make sure everything proceeded according to plan.
   Console::WriteLine( "aPoint.x = {0}", myDynamicType->InvokeMember( "GetX", BindingFlags::InvokeMethod, nullptr, aPoint, gcnew array<Object^>(0) ) );
   Console::WriteLine( "aPoint.y = {0}", myDynamicType->InvokeMember( "GetY", BindingFlags::InvokeMethod, nullptr, aPoint, gcnew array<Object^>(0) ) );
   Console::WriteLine( "aPoint.z = {0}", myDynamicType->InvokeMember( "GetZ", BindingFlags::InvokeMethod, nullptr, aPoint, gcnew array<Object^>(0) ) );
   
   // +++ OUTPUT +++
   // Some information about my new Type 'Point':
   // Assembly: 'MyDynamicAssembly, Version=0.0.0.0'
   // Attributes: 'AutoLayout, AnsiClass, NotPublic, Public'
   // Module: 'PointModule'
   // Members:
   // -- Field x;
   // -- Field y;
   // -- Field z;
   // -- Method GetHashCode;
   // -- Method Equals;
   // -- Method ToString;
   // -- Method GetType;
   // -- Constructor .ctor;
   // ---
   // Constructor: Void .ctor(Int32, Int32, Int32);
   // ---
   // aPoint is type Point.
   // aPoint.x = 4
   // aPoint.y = 5
   // aPoint.z = 6
}

using System;
using System.Threading;
using System.Reflection;
using System.Reflection.Emit;

class TestCtorBuilder {

    public static Type DynamicPointTypeGen() {
    
       Type pointType = null;
       Type[] ctorParams = new Type[] {typeof(int),
                        typeof(int),
                        typeof(int)};
    
       AppDomain myDomain = Thread.GetDomain();
       AssemblyName myAsmName = new AssemblyName();
       myAsmName.Name = "MyDynamicAssembly";
    
       AssemblyBuilder myAsmBuilder = myDomain.DefineDynamicAssembly(
                      myAsmName,
                      AssemblyBuilderAccess.RunAndSave);

       ModuleBuilder pointModule = myAsmBuilder.DefineDynamicModule("PointModule",
                                    "Point.dll");

       TypeBuilder pointTypeBld = pointModule.DefineType("Point",
                                      TypeAttributes.Public);

       FieldBuilder xField = pointTypeBld.DefineField("x", typeof(int),
                                                          FieldAttributes.Public);
       FieldBuilder yField = pointTypeBld.DefineField("y", typeof(int),
                                                          FieldAttributes.Public);
       FieldBuilder zField = pointTypeBld.DefineField("z", typeof(int),
                                                          FieldAttributes.Public);

           Type objType = Type.GetType("System.Object");
           ConstructorInfo objCtor = objType.GetConstructor(new Type[0]);

       ConstructorBuilder pointCtor = pointTypeBld.DefineConstructor(
                      MethodAttributes.Public,
                      CallingConventions.Standard,
                      ctorParams);
       ILGenerator ctorIL = pointCtor.GetILGenerator();

       // NOTE: ldarg.0 holds the "this" reference - ldarg.1, ldarg.2, and ldarg.3
       // hold the actual passed parameters. ldarg.0 is used by instance methods
       // to hold a reference to the current calling object instance. Static methods
       // do not use arg.0, since they are not instantiated and hence no reference
       // is needed to distinguish them.

           ctorIL.Emit(OpCodes.Ldarg_0);

       // Here, we wish to create an instance of System.Object by invoking its
       // constructor, as specified above.

           ctorIL.Emit(OpCodes.Call, objCtor);

       // Now, we'll load the current instance ref in arg 0, along
       // with the value of parameter "x" stored in arg 1, into stfld.

           ctorIL.Emit(OpCodes.Ldarg_0);
           ctorIL.Emit(OpCodes.Ldarg_1);
           ctorIL.Emit(OpCodes.Stfld, xField);

       // Now, we store arg 2 "y" in the current instance with stfld.

           ctorIL.Emit(OpCodes.Ldarg_0);
           ctorIL.Emit(OpCodes.Ldarg_2);
           ctorIL.Emit(OpCodes.Stfld, yField);

       // Last of all, arg 3 "z" gets stored in the current instance.

           ctorIL.Emit(OpCodes.Ldarg_0);
           ctorIL.Emit(OpCodes.Ldarg_3);
           ctorIL.Emit(OpCodes.Stfld, zField);

           // Our work complete, we return.

       ctorIL.Emit(OpCodes.Ret);

       // Now, let's create three very simple methods so we can see our fields.

       string[] mthdNames = new string[] {"GetX", "GetY", "GetZ"};

           foreach (string mthdName in mthdNames) {
              MethodBuilder getFieldMthd = pointTypeBld.DefineMethod(
                           mthdName,
                           MethodAttributes.Public,
                                           typeof(int),
                                           null);
          ILGenerator mthdIL = getFieldMthd.GetILGenerator();
    
          mthdIL.Emit(OpCodes.Ldarg_0);
          switch (mthdName) {
             case "GetX": mthdIL.Emit(OpCodes.Ldfld, xField);
                  break;
             case "GetY": mthdIL.Emit(OpCodes.Ldfld, yField);
                  break;
             case "GetZ": mthdIL.Emit(OpCodes.Ldfld, zField);
                  break;
          }
          mthdIL.Emit(OpCodes.Ret);
           }
       // Finally, we create the type.

       pointType = pointTypeBld.CreateType();

       // Let's save it, just for posterity.
    
       myAsmBuilder.Save("Point.dll");
    
       return pointType;
    }

    public static void Main() {
    
       Type myDynamicType = null;
           object aPoint = null;
       Type[] aPtypes = new Type[] {typeof(int), typeof(int), typeof(int)};
           object[] aPargs = new object[] {4, 5, 6};
    
       // Call the  method to build our dynamic class.

       myDynamicType = DynamicPointTypeGen();

       Console.WriteLine("Some information about my new Type '{0}':",
                  myDynamicType.FullName);
       Console.WriteLine("Assembly: '{0}'", myDynamicType.Assembly);
       Console.WriteLine("Attributes: '{0}'", myDynamicType.Attributes);
       Console.WriteLine("Module: '{0}'", myDynamicType.Module);
       Console.WriteLine("Members: ");
       foreach (MemberInfo member in myDynamicType.GetMembers()) {
        Console.WriteLine("-- {0} {1};", member.MemberType, member.Name);
       }

           Console.WriteLine("---");

       // Let's take a look at the constructor we created.

       ConstructorInfo myDTctor = myDynamicType.GetConstructor(aPtypes);
           Console.WriteLine("Constructor: {0};", myDTctor.ToString());

           Console.WriteLine("---");
    
           // Now, we get to use our dynamically-created class by invoking the constructor.

       aPoint = myDTctor.Invoke(aPargs);
           Console.WriteLine("aPoint is type {0}.", aPoint.GetType());

       // Finally, let's reflect on the instance of our new type - aPoint - and
       // make sure everything proceeded according to plan.

       Console.WriteLine("aPoint.x = {0}",
                 myDynamicType.InvokeMember("GetX",
                                BindingFlags.InvokeMethod,
                            null,
                            aPoint,
                            new object[0]));
       Console.WriteLine("aPoint.y = {0}",
                 myDynamicType.InvokeMember("GetY",
                                BindingFlags.InvokeMethod,
                            null,
                            aPoint,
                            new object[0]));
       Console.WriteLine("aPoint.z = {0}",
                 myDynamicType.InvokeMember("GetZ",
                                BindingFlags.InvokeMethod,
                            null,
                            aPoint,
                            new object[0]));

       // +++ OUTPUT +++
       // Some information about my new Type 'Point':
       // Assembly: 'MyDynamicAssembly, Version=0.0.0.0'
       // Attributes: 'AutoLayout, AnsiClass, NotPublic, Public'
       // Module: 'PointModule'
       // Members:
       // -- Field x;
       // -- Field y;
       // -- Field z;
           // -- Method GetHashCode;
           // -- Method Equals;
           // -- Method ToString;
           // -- Method GetType;
           // -- Constructor .ctor;
       // ---
       // Constructor: Void .ctor(Int32, Int32, Int32);
       // ---
       // aPoint is type Point.
       // aPoint.x = 4
       // aPoint.y = 5
       // aPoint.z = 6
    }
}

Imports System.Threading
Imports System.Reflection
Imports System.Reflection.Emit

 _

Class TestCtorBuilder
   
   
   Public Shared Function DynamicPointTypeGen() As Type
      
      Dim pointType As Type = Nothing
      Dim ctorParams() As Type = {GetType(Integer), GetType(Integer), GetType(Integer)}
      
      Dim myDomain As AppDomain = Thread.GetDomain()
      Dim myAsmName As New AssemblyName()
      myAsmName.Name = "MyDynamicAssembly"
      
      Dim myAsmBuilder As AssemblyBuilder = myDomain.DefineDynamicAssembly(myAsmName, AssemblyBuilderAccess.RunAndSave)
      
      Dim pointModule As ModuleBuilder = myAsmBuilder.DefineDynamicModule("PointModule", "Point.dll")
      
      Dim pointTypeBld As TypeBuilder = pointModule.DefineType("Point", TypeAttributes.Public)
      
      Dim xField As FieldBuilder = pointTypeBld.DefineField("x", GetType(Integer), FieldAttributes.Public)
      Dim yField As FieldBuilder = pointTypeBld.DefineField("y", GetType(Integer), FieldAttributes.Public)
      Dim zField As FieldBuilder = pointTypeBld.DefineField("z", GetType(Integer), FieldAttributes.Public)
      
      Dim objType As Type = Type.GetType("System.Object")
      Dim objCtor As ConstructorInfo = objType.GetConstructor(New Type() {})
      
      Dim pointCtor As ConstructorBuilder = pointTypeBld.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, ctorParams)
      Dim ctorIL As ILGenerator = pointCtor.GetILGenerator()
      
      ' NOTE: ldarg.0 holds the "this" reference - ldarg.1, ldarg.2, and ldarg.3
      ' hold the actual passed parameters. ldarg.0 is used by instance methods
      ' to hold a reference to the current calling object instance. Static methods
      ' do not use arg.0, since they are not instantiated and hence no reference
      ' is needed to distinguish them. 
      ctorIL.Emit(OpCodes.Ldarg_0)
      
      ' Here, we wish to create an instance of System.Object by invoking its
      ' constructor, as specified above.
      ctorIL.Emit(OpCodes.Call, objCtor)
      
      ' Now, we'll load the current instance ref in arg 0, along
      ' with the value of parameter "x" stored in arg 1, into stfld.
      ctorIL.Emit(OpCodes.Ldarg_0)
      ctorIL.Emit(OpCodes.Ldarg_1)
      ctorIL.Emit(OpCodes.Stfld, xField)
      
      ' Now, we store arg 2 "y" in the current instance with stfld.
      ctorIL.Emit(OpCodes.Ldarg_0)
      ctorIL.Emit(OpCodes.Ldarg_2)
      ctorIL.Emit(OpCodes.Stfld, yField)
      
      ' Last of all, arg 3 "z" gets stored in the current instance.
      ctorIL.Emit(OpCodes.Ldarg_0)
      ctorIL.Emit(OpCodes.Ldarg_3)
      ctorIL.Emit(OpCodes.Stfld, zField)
      
      ' Our work complete, we return.
      ctorIL.Emit(OpCodes.Ret)
      
      ' Now, let's create three very simple methods so we can see our fields.
      Dim mthdNames() As String = {"GetX", "GetY", "GetZ"}
      
      Dim mthdName As String
      For Each mthdName In  mthdNames
         Dim getFieldMthd As MethodBuilder = pointTypeBld.DefineMethod(mthdName, MethodAttributes.Public, GetType(Integer), Nothing)
         Dim mthdIL As ILGenerator = getFieldMthd.GetILGenerator()
         
         mthdIL.Emit(OpCodes.Ldarg_0)
         Select Case mthdName
            Case "GetX"
               mthdIL.Emit(OpCodes.Ldfld, xField)
            Case "GetY"
               mthdIL.Emit(OpCodes.Ldfld, yField)
            Case "GetZ"
               mthdIL.Emit(OpCodes.Ldfld, zField)
         End Select
         
         mthdIL.Emit(OpCodes.Ret)
      Next mthdName 
      ' Finally, we create the type.
      pointType = pointTypeBld.CreateType()
      
      ' Let's save it, just for posterity.
      myAsmBuilder.Save("Point.dll")
      
      Return pointType
   End Function 'DynamicPointTypeGen
    
   
   Public Shared Sub Main()
      
      Dim myDynamicType As Type = Nothing
      Dim aPoint As Object = Nothing
      Dim aPtypes() As Type = {GetType(Integer), GetType(Integer), GetType(Integer)}
      Dim aPargs() As Object = {4, 5, 6}
      
      ' Call the  method to build our dynamic class.
      myDynamicType = DynamicPointTypeGen()
      
      Console.WriteLine("Some information about my new Type '{0}':", myDynamicType.FullName)
      Console.WriteLine("Assembly: '{0}'", myDynamicType.Assembly)
      Console.WriteLine("Attributes: '{0}'", myDynamicType.Attributes)
      Console.WriteLine("Module: '{0}'", myDynamicType.Module)
      Console.WriteLine("Members: ")
      Dim member As MemberInfo
      For Each member In  myDynamicType.GetMembers()
         Console.WriteLine("-- {0} {1};", member.MemberType, member.Name)
      Next member
      
      Console.WriteLine("---")
      
      ' Let's take a look at the constructor we created.
      Dim myDTctor As ConstructorInfo = myDynamicType.GetConstructor(aPtypes)
      Console.WriteLine("Constructor: {0};", myDTctor.ToString())
      
      Console.WriteLine("---")
      
      ' Now, we get to use our dynamically-created class by invoking the constructor. 
      aPoint = myDTctor.Invoke(aPargs)
      Console.WriteLine("aPoint is type {0}.", aPoint.GetType())
      
      
      ' Finally, let's reflect on the instance of our new type - aPoint - and
      ' make sure everything proceeded according to plan.
      Console.WriteLine("aPoint.x = {0}", myDynamicType.InvokeMember("GetX", BindingFlags.InvokeMethod, Nothing, aPoint, New Object() {}))
      Console.WriteLine("aPoint.y = {0}", myDynamicType.InvokeMember("GetY", BindingFlags.InvokeMethod, Nothing, aPoint, New Object() {}))
      Console.WriteLine("aPoint.z = {0}", myDynamicType.InvokeMember("GetZ", BindingFlags.InvokeMethod, Nothing, aPoint, New Object() {}))
   End Sub
End Class



' +++ OUTPUT +++
' Some information about my new Type 'Point':
' Assembly: 'MyDynamicAssembly, Version=0.0.0.0'
' Attributes: 'AutoLayout, AnsiClass, NotPublic, Public'
' Module: 'PointModule'
' Members: 
' -- Field x;
' -- Field y;
' -- Field z;
' -- Method GetHashCode;
' -- Method Equals;
' -- Method ToString;
' -- Method GetType;
' -- Constructor .ctor;
' ---
' Constructor: Void .ctor(Int32, Int32, Int32);
' ---
' aPoint is type Point.
' aPoint.x = 4
' aPoint.y = 5
' aPoint.z = 6

Commenti

Il runtime genera il codice per i costruttori predefiniti. Pertanto, se viene effettuato un tentativo di ottenere un ILGeneratoroggetto , verrà generata un'eccezione.