ILGenerator.EmitCall(OpCode, MethodInfo, Type[]) Yöntem

Tanım

Ad Alanı:

System.Reflection.Emit

Bütünleştirilmiş Kod:

System.Reflection.Emit.ILGeneration.dll

Kaynak:

ILGenerator.cs

Bir call yöntemi çağırmak için Microsoft ara dili (MSIL) akışına bir veya callvirt yönergesi varargs yerleştirir.

public:
 abstract void EmitCall(System::Reflection::Emit::OpCode opcode, System::Reflection::MethodInfo ^ methodInfo, cli::array <Type ^> ^ optionalParameterTypes);

public abstract void EmitCall (System.Reflection.Emit.OpCode opcode, System.Reflection.MethodInfo methodInfo, Type[]? optionalParameterTypes);

abstract member EmitCall : System.Reflection.Emit.OpCode * System.Reflection.MethodInfo * Type[] -> unit

Public MustOverride Sub EmitCall (opcode As OpCode, methodInfo As MethodInfo, optionalParameterTypes As Type())

Parametreler

opcode

OpCode

Akışa yayılacak MSIL yönergesi. , Callvirtveya NewobjolmalıdırCall.

methodInfo

MethodInfo

varargs Çağrılacak yöntem.

optionalParameterTypes

Type[]

Yöntem bir varargs yöntemse isteğe bağlı bağımsız değişkenlerin türleri; değilse, null.

Özel durumlar

ArgumentException

opcode bir yöntem çağrısı belirtmez.

ArgumentNullException

methodInfo, null değeridir.

InvalidOperationException

yöntemi için çağırma kuralı değildir varargs, ancak isteğe bağlı parametre türleri sağlanır. Bu özel durum, .NET Framework 1.0 ve 1.1 sürümlerinde oluşturulur, sonraki sürümlerde özel durum atılır.

Örnekler

Aşağıdaki kod örneği iki yöntem gösterir: bir varargs yöntem ve yöntemini çağıran varargs bir yöntem. EmitCall yöntemi, çağrısının yöntemine yaymak için varargs kullanılır.

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

void main() 
{
    String^ name = "InMemory";

    AssemblyBuilder^ asmBldr = 
       AppDomain::CurrentDomain->DefineDynamicAssembly(gcnew AssemblyName(name), 
          AssemblyBuilderAccess::Run);
    ModuleBuilder^ modBldr = asmBldr->DefineDynamicModule(name); 

    TypeBuilder^ tb = modBldr->DefineType("DemoVararg");

    // Create a vararg method with no return value and one 
    // string argument. (The string argument type is the only
    // element of an array of Type objects.)
    //
    MethodBuilder^ mb1 = tb->DefineMethod("VarargMethod",
        MethodAttributes::Public | MethodAttributes::Static,
        CallingConventions::VarArgs,
        nullptr, 
        gcnew array<Type^> { String::typeid });

    ILGenerator^ il1 = mb1->GetILGenerator();

    LocalBuilder^ locAi = il1->DeclareLocal(ArgIterator::typeid);
    LocalBuilder^ locNext = il1->DeclareLocal(bool::typeid);

    Label labelCheckCondition = il1->DefineLabel();
    Label labelNext = il1->DefineLabel();

    // Load the fixed argument and print it.
    il1->Emit(OpCodes::Ldarg_0);
    il1->Emit(OpCodes::Call, Console::typeid->GetMethod("Write", 
         gcnew array<Type^> { String::typeid }));

    // Load the address of the local variable represented by
    // locAi, which will hold the ArgIterator.
    il1->Emit(OpCodes::Ldloca_S, locAi);

    // Load the address of the argument list, and call the 
    // ArgIterator constructor that takes an array of runtime
    // argument handles. 
    il1->Emit(OpCodes::Arglist);
    il1->Emit(OpCodes::Call, ArgIterator::typeid->GetConstructor(
         gcnew array<Type^> { RuntimeArgumentHandle::typeid }));

    // Enter the loop at the point where the remaining argument
    // count is tested.
    il1->Emit(OpCodes::Br_S, labelCheckCondition);

    // At the top of the loop, call GetNextArg to get the next 
    // argument from the ArgIterator. Convert the typed reference
    // to an object reference and write the object to the console.
    il1->MarkLabel(labelNext);
    il1->Emit(OpCodes::Ldloca_S, locAi);
    il1->Emit(OpCodes::Call, ArgIterator::typeid->GetMethod("GetNextArg", Type::EmptyTypes));
    il1->Emit(OpCodes::Call, TypedReference::typeid->GetMethod("ToObject"));
    il1->Emit(OpCodes::Call, Console::typeid->GetMethod("Write", 
         gcnew array<Type^> { Object::typeid }));

    il1->MarkLabel(labelCheckCondition);
    il1->Emit(OpCodes::Ldloca_S, locAi);
    il1->Emit(OpCodes::Call, ArgIterator::typeid->GetMethod("GetRemainingCount"));

    // If the remaining count is greater than zero, go to
    // the top of the loop.
    il1->Emit(OpCodes::Ldc_I4_0);
    il1->Emit(OpCodes::Cgt);
    il1->Emit(OpCodes::Stloc_1);
    il1->Emit(OpCodes::Ldloc_1);
    il1->Emit(OpCodes::Brtrue_S, labelNext);

    il1->Emit(OpCodes::Ret);

    // Create a method that contains a call to the vararg 
    // method.
    MethodBuilder^ mb2 = tb->DefineMethod("CallVarargMethod",
        MethodAttributes::Public | MethodAttributes::Static,
        CallingConventions::Standard,
        nullptr, Type::EmptyTypes);

    ILGenerator^ il2 = mb2->GetILGenerator();

    // Push arguments on the stack: one for the fixed string
    // parameter, and two for the list.
    il2->Emit(OpCodes::Ldstr, "Hello ");
    il2->Emit(OpCodes::Ldstr, "world ");
    il2->Emit(OpCodes::Ldc_I4, 2006);

    // Call the vararg method, specifying the types of the 
    // arguments in the list.
    il2->EmitCall(OpCodes::Call, mb1, 
        gcnew array<Type^> { String::typeid, int::typeid });

    il2->Emit(OpCodes::Ret);

    Type^ type = tb->CreateType();
    type->GetMethod("CallVarargMethod")->Invoke(nullptr, nullptr);
}

/* This code example produces the following output:

Hello world 2006
 */

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

class Example
{
    static void Main()
    {
        string name = "InMemory";

        AssemblyBuilder asmBldr =
           AppDomain.CurrentDomain.DefineDynamicAssembly(new AssemblyName(name),
              AssemblyBuilderAccess.Run);
        ModuleBuilder modBldr = asmBldr.DefineDynamicModule(name);

        TypeBuilder tb = modBldr.DefineType("DemoVararg");

        // Create a vararg method with no return value and one
        // string argument. (The string argument type is the only
        // element of an array of Type objects.)
        //
        MethodBuilder mb1 = tb.DefineMethod("VarargMethod",
            MethodAttributes.Public | MethodAttributes.Static,
            CallingConventions.VarArgs,
            null,
            new Type[] { typeof(string) });

        ILGenerator il1 = mb1.GetILGenerator();

        LocalBuilder locAi = il1.DeclareLocal(typeof(ArgIterator));
        LocalBuilder locNext = il1.DeclareLocal(typeof(bool));

        Label labelCheckCondition = il1.DefineLabel();
        Label labelNext = il1.DefineLabel();

        // Load the fixed argument and print it.
        il1.Emit(OpCodes.Ldarg_0);
        il1.Emit(OpCodes.Call, typeof(Console).GetMethod("Write", new Type[] { typeof(string) }));

        // Load the address of the local variable represented by
        // locAi, which will hold the ArgIterator.
        il1.Emit(OpCodes.Ldloca_S, locAi);

        // Load the address of the argument list, and call the
        // ArgIterator constructor that takes an array of runtime
        // argument handles.
        il1.Emit(OpCodes.Arglist);
        il1.Emit(OpCodes.Call, typeof(ArgIterator).GetConstructor(new Type[] { typeof(RuntimeArgumentHandle) }));

        // Enter the loop at the point where the remaining argument
        // count is tested.
        il1.Emit(OpCodes.Br_S, labelCheckCondition);

        // At the top of the loop, call GetNextArg to get the next
        // argument from the ArgIterator. Convert the typed reference
        // to an object reference and write the object to the console.
        il1.MarkLabel(labelNext);
        il1.Emit(OpCodes.Ldloca_S, locAi);
        il1.Emit(OpCodes.Call, typeof(ArgIterator).GetMethod("GetNextArg", Type.EmptyTypes));
        il1.Emit(OpCodes.Call, typeof(TypedReference).GetMethod("ToObject"));
        il1.Emit(OpCodes.Call, typeof(Console).GetMethod("Write", new Type[] { typeof(object) }));

        il1.MarkLabel(labelCheckCondition);
        il1.Emit(OpCodes.Ldloca_S, locAi);
        il1.Emit(OpCodes.Call, typeof(ArgIterator).GetMethod("GetRemainingCount"));

        // If the remaining count is greater than zero, go to
        // the top of the loop.
        il1.Emit(OpCodes.Ldc_I4_0);
        il1.Emit(OpCodes.Cgt);
        il1.Emit(OpCodes.Stloc_1);
        il1.Emit(OpCodes.Ldloc_1);
        il1.Emit(OpCodes.Brtrue_S, labelNext);

        il1.Emit(OpCodes.Ret);

        // Create a method that contains a call to the vararg
        // method.
        MethodBuilder mb2 = tb.DefineMethod("CallVarargMethod",
            MethodAttributes.Public | MethodAttributes.Static,
            CallingConventions.Standard,
            typeof(void), Type.EmptyTypes);
        ILGenerator il2 = mb2.GetILGenerator();

        // Push arguments on the stack: one for the fixed string
        // parameter, and two for the list.
        il2.Emit(OpCodes.Ldstr, "Hello ");
        il2.Emit(OpCodes.Ldstr, "world ");
        il2.Emit(OpCodes.Ldc_I4, 2006);

        // Call the vararg method, specifying the types of the
        // arguments in the list.
        il2.EmitCall(OpCodes.Call, mb1, new Type[] { typeof(string), typeof(int) });

        il2.Emit(OpCodes.Ret);

        Type type = tb.CreateType();
        type.GetMethod("CallVarargMethod").Invoke(null, null);
    }
}

/* This code example produces the following output:

Hello world 2006
 */

Imports System.Reflection
Imports System.Reflection.Emit

Class Example
    
    Shared Sub Main() 

        Dim name As String = "InMemory"
        
        Dim asmBldr As AssemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly( _
            New AssemblyName(name), AssemblyBuilderAccess.Run)
        Dim modBldr As ModuleBuilder = asmBldr.DefineDynamicModule(name)
        
        Dim tb As TypeBuilder = modBldr.DefineType("DemoVararg")
        
        ' Create a vararg method with no return value and one 
        ' string argument. (The string argument type is the only
        ' element of an array of Type objects.)
        '
        Dim mb1 As MethodBuilder = tb.DefineMethod("VarargMethod", _
            MethodAttributes.Public Or MethodAttributes.Static, _
            CallingConventions.VarArgs, _
            Nothing, _
            New Type() {GetType(String)})
        
        Dim il1 As ILGenerator = mb1.GetILGenerator()
        
        Dim locAi As LocalBuilder = il1.DeclareLocal(GetType(ArgIterator))
        Dim locNext As LocalBuilder = il1.DeclareLocal(GetType(Boolean))
        
        Dim labelCheckCondition As Label = il1.DefineLabel()
        Dim labelNext As Label = il1.DefineLabel()
        
        ' Load the fixed argument and print it.
        il1.Emit(OpCodes.Ldarg_0)
        il1.Emit(OpCodes.Call, GetType(Console).GetMethod("Write", _
            New Type() {GetType(String)}))
        
        ' Load the address of the local variable represented by
        ' locAi, which will hold the ArgIterator.
        il1.Emit(OpCodes.Ldloca_S, locAi)
        
        ' Load the address of the argument list, and call the 
        ' ArgIterator constructor that takes an array of runtime
        ' argument handles. 
        il1.Emit(OpCodes.Arglist)
        il1.Emit(OpCodes.Call, GetType(ArgIterator).GetConstructor( _
            New Type() {GetType(RuntimeArgumentHandle)}))
        
        ' Enter the loop at the point where the remaining argument
        ' count is tested.
        il1.Emit(OpCodes.Br_S, labelCheckCondition)
        
        ' At the top of the loop, call GetNextArg to get the next 
        ' argument from the ArgIterator. Convert the typed reference
        ' to an object reference and write the object to the console.
        il1.MarkLabel(labelNext)
        il1.Emit(OpCodes.Ldloca_S, locAi)
        il1.Emit(OpCodes.Call, _
            GetType(ArgIterator).GetMethod("GetNextArg", Type.EmptyTypes))
        il1.Emit(OpCodes.Call, GetType(TypedReference).GetMethod("ToObject"))
        il1.Emit(OpCodes.Call, _
            GetType(Console).GetMethod("Write", New Type() {GetType(Object)}))
        
        il1.MarkLabel(labelCheckCondition)
        il1.Emit(OpCodes.Ldloca_S, locAi)
        il1.Emit(OpCodes.Call, _
            GetType(ArgIterator).GetMethod("GetRemainingCount"))
        
        ' If the remaining count is greater than zero, go to
        ' the top of the loop.
        il1.Emit(OpCodes.Ldc_I4_0)
        il1.Emit(OpCodes.Cgt)
        il1.Emit(OpCodes.Stloc_1)
        il1.Emit(OpCodes.Ldloc_1)
        il1.Emit(OpCodes.Brtrue_S, labelNext)
        
        il1.Emit(OpCodes.Ret)
        
        ' Create a method that contains a call to the vararg 
        ' method.
        Dim mb2 As MethodBuilder = tb.DefineMethod("CallVarargMethod", _
            MethodAttributes.Public Or MethodAttributes.Static, _
            CallingConventions.Standard, _
            Nothing, _
            Type.EmptyTypes)

        Dim il2 As ILGenerator = mb2.GetILGenerator()
        
        ' Push arguments on the stack: one for the fixed string
        ' parameter, and two for the list.
        il2.Emit(OpCodes.Ldstr, "Hello ")
        il2.Emit(OpCodes.Ldstr, "world ")
        il2.Emit(OpCodes.Ldc_I4, 2006)
        
        ' Call the vararg method, specifying the types of the 
        ' arguments in the list.
        il2.EmitCall(OpCodes.Call, mb1, _
            New Type() {GetType(String), GetType(Integer)})
        
        il2.Emit(OpCodes.Ret)
        
        Dim myType As Type = tb.CreateType()
        myType.GetMethod("CallVarargMethod").Invoke(Nothing, Nothing)
    
    End Sub 
End Class 

' This code example produces the following output:
'
'Hello world 2006
'

Açıklamalar

EmitCall yöntemi, değişken bağımsız değişkenlerinin parametre türlerini belirten yöntemin Emit aşırı yüklemesi olmadığından yöntemlere çağrıları varargs yaymak için kullanılır.

Çağrıları çağırma kuralını kullanmayan yöntemlere VarArgs yaymak için yöntem aşırı yüklemesini Emit(OpCode, MethodInfo) kullanın.

EmitCall olmayan bir yöntem için isteğe bağlı parametre türleri belirtildiğinde yöntemi özel durum oluşturmazvarargs. InvalidProgramException çağrısı yürütülürken oluşturulur.