TypeBuilder.GetConstructor(Type, ConstructorInfo) TypeBuilder.GetConstructor(Type, ConstructorInfo) TypeBuilder.GetConstructor(Type, ConstructorInfo) Method

定義

ジェネリック型定義の指定されたコンストラクターに対応する、指定の構築されたジェネリック型のコンストラクターを返します。Returns the constructor of the specified constructed generic type that corresponds to the specified constructor of the generic type definition.

public:
 static System::Reflection::ConstructorInfo ^ GetConstructor(Type ^ type, System::Reflection::ConstructorInfo ^ constructor);
public static System.Reflection.ConstructorInfo GetConstructor (Type type, System.Reflection.ConstructorInfo constructor);
static member GetConstructor : Type * System.Reflection.ConstructorInfo -> System.Reflection.ConstructorInfo

パラメーター

type
Type Type Type

コンストラクターが返される構築されたジェネリック型。The constructed generic type whose constructor is returned.

constructor
ConstructorInfo ConstructorInfo ConstructorInfo

返す type のコンストラクターを指定する、type のジェネリック型定義のコンストラクター。A constructor on the generic type definition of type, which specifies which constructor of type to return.

戻り値

type のジェネリック型定義に属するコンストラクターを指定する、constructor に対応する type のコンストラクターを表す ConstructorInfo オブジェクト。A ConstructorInfo object that represents the constructor of type corresponding to constructor, which specifies a constructor belonging to the generic type definition of type.

例外

type がジェネリック型を表していません。type does not represent a generic type.

または-or- typeTypeBuilder 型ではありません。type is not of type TypeBuilder.

または-or- constructor の宣言する型はジェネリック型定義ではありません。The declaring type of constructor is not a generic type definition.

または-or- constructor の宣言する型は type のジェネリック型定義ではありません。The declaring type of constructor is not the generic type definition of type.

次のコード例には、という名前のジェネリック クラスのソース コードが含まれています。Sampleという名前の型パラメーターを持つTします。The following code example contains source code for a generic class named Sample that has a type parameter named T. という名前のフィールドをクラスにはField、型のT、という名前のジェネリック メソッドGMという名前の独自の型パラメーターを持つUします。The class has a field named Field, of type T, and a generic method named GM with its own type parameter, named U. メソッドGMのインスタンスを作成しますSample、独自の型パラメーターの置換Uの型パラメーターに対してSample、し、その入力パラメーターを格納Fieldします。Method GM creates an instance of Sample, substituting its own type parameter U for the type parameter of Sample, and stores its input parameter in Field. このソース コードはコンパイルされますが、使用されません。表示できます、 Ildasm.exe (IL Disassembler)クラスによって出力されるコードとの比較とExampleします。This source code is compiled but not used; you can view it with the Ildasm.exe (IL Disassembler) and compare it to the code emitted by class Example.

クラスのコードExampleの使用方法を示します、GetConstructorジェネリック コードを出力するメソッド。The code in class Example demonstrates the use of the GetConstructor method to emit generic code. MainクラスのメソッドExampleという名前のクラスを含む動的アセンブリを作成します。Sampleを使用して、DefineGenericParametersメソッドという名前の型パラメーターを追加することで汎用的なものをTします。The Main method of class Example creates a dynamic assembly containing a class named Sample and uses the DefineGenericParameters method to make it generic by adding a type parameter named T. 既定のコンス トラクターとという名前のフィールドField、型のT、クラスに追加されますSampleします。A default constructor and a field named Field, of type T, are added to class Sample. メソッドGMが追加されを使用してジェネリック メソッドに変換、MethodBuilder.DefineGenericParametersメソッド。A method GM is added and turned into a generic method by using the MethodBuilder.DefineGenericParameters method. 型パラメーターGMというUします。The type parameter of GM is named U. 型パラメーターを定義すると後のシグネチャGMを使用して追加、MethodBuilder.SetSignatureメソッド。After the type parameter is defined, the signature of GM is added by using the MethodBuilder.SetSignature method. 戻り値の型と必要ありませんが、またはカスタム修飾子は、このメソッドのすべてのパラメーターは、nullを除くparameterTypes;parameterTypesにメソッドの唯一のパラメーターの型を設定Uメソッドのジェネリック型パラメーター。There is no return type and no required or custom modifiers, so all the parameters of this method are null except parameterTypes; parameterTypes sets the type of the method's only parameter to U, the method's generic type parameter. メソッドの本体は、構築された型のインスタンスを作成します。 Sample<U> (Sample(Of U) Visual basic)、メソッドのパラメーターに割り当てますField、しの値を出力しますFieldします。The body of the method creates an instance of the constructed type Sample<U> (Sample(Of U) in Visual Basic), assigns the method's parameter to Field, and then prints the value of Field. GetConstructorメソッドの使用を作成、ConstructorInfo構築されたジェネリック型の既定のコンス トラクターを表すSample<U>で、OpCodes.Newobj命令をインスタンスを作成します。The GetConstructor method is used to create a ConstructorInfo that represents the default constructor of the constructed generic type Sample<U> in the OpCodes.Newobj instruction that creates the instance.

エントリ ポイント メソッドを保持するためにダミーの型が定義されているMainします。A dummy type is defined to hold the entry-point method Main. 本体でMain、静的なGM構築されたジェネリック型のメソッドが呼び出されるSample<int>(Sample(Of Integer) Visual Basic で)、型のStringの代わりに使用Uします。In the body of Main, the static GM method is invoked on the constructed generic type Sample<int> (Sample(Of Integer) in Visual Basic), with type String substituted for U.

コード例を実行すると、TypeBuilderGetFieldExample.exe として生成されたアセンブリが保存されます。When the code example is run, it saves the emitted assembly as TypeBuilderGetFieldExample.exe. TypeBuilderGetFieldExample.exe を実行して、使用することができます、 Ildasm.exe (IL Disassembler) 、出力コードのコードを比較する、Sample自体のコード例にコンパイルされるクラス。You can run TypeBuilderGetFieldExample.exe, and you can use the Ildasm.exe (IL Disassembler) to compare the emitted code with the code for the Sample class that is compiled into the code example itself.

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

// Compare the MSIL in this class to the MSIL
// generated by the Reflection.Emit code in class
// Example.
public class Sample<T>
{
  public T Field;
  public static void GM<U>(U val)
  {
    Sample<U> s = new Sample<U>();
    s.Field = val;
    Console.WriteLine(s.Field);
  }
}

public class Example
{
    public static void Main()
    {
        AppDomain myDomain = AppDomain.CurrentDomain;
        AssemblyName myAsmName = 
            new AssemblyName("TypeBuilderGetFieldExample");
        AssemblyBuilder myAssembly = myDomain.DefineDynamicAssembly(
            myAsmName, AssemblyBuilderAccess.Save);
        ModuleBuilder myModule = myAssembly.DefineDynamicModule(
            myAsmName.Name, 
            myAsmName.Name + ".exe");

        // Define the sample type.
        TypeBuilder myType = myModule.DefineType("Sample", 
            TypeAttributes.Class | TypeAttributes.Public);

        // Add a type parameter, making the type generic.
        string[] typeParamNames = {"T"};  
        GenericTypeParameterBuilder[] typeParams = 
            myType.DefineGenericParameters(typeParamNames);

        // Define a default constructor. Normally it would 
        // not be necessary to define the default constructor,
        // but in this case it is needed for the call to
        // TypeBuilder.GetConstructor, which gets the default
        // constructor for the generic type constructed from 
        // Sample<T>, in the generic method GM<U>.
        ConstructorBuilder ctor = myType.DefineDefaultConstructor(
            MethodAttributes.PrivateScope | MethodAttributes.Public |
            MethodAttributes.HideBySig | MethodAttributes.SpecialName |
            MethodAttributes.RTSpecialName);

        // Add a field of type T, with the name Field.
        FieldBuilder myField = myType.DefineField("Field", 
            typeParams[0],
            FieldAttributes.Public);

        // Add a method and make it generic, with a type 
        // parameter named U. Note how similar this is to 
        // the way Sample is turned into a generic type. The
        // method has no signature, because the type of its
        // only parameter is U, which is not yet defined.
        MethodBuilder genMethod = myType.DefineMethod("GM", 
            MethodAttributes.Public | MethodAttributes.Static);
        string[] methodParamNames = {"U"};
        GenericTypeParameterBuilder[] methodParams = 
            genMethod.DefineGenericParameters(methodParamNames);
        
        // Now add a signature for genMethod, specifying U
        // as the type of the parameter. There is no return value
        // and no custom modifiers.
        genMethod.SetSignature(null, null, null, 
            new Type[] { methodParams[0] }, null, null);

        // Emit a method body for the generic method.
        ILGenerator ilg = genMethod.GetILGenerator();
        // Construct the type Sample<U> using MakeGenericType.
        Type SampleOfU = myType.MakeGenericType( methodParams[0] );
        // Create a local variable to store the instance of
        // Sample<U>.
        ilg.DeclareLocal(SampleOfU);
        // Call the default constructor. Note that it is 
        // necessary to have the default constructor for the
        // constructed generic type Sample<U>; use the 
        // TypeBuilder.GetConstructor method to obtain this 
        // constructor.
        ConstructorInfo ctorOfU = TypeBuilder.GetConstructor(
            SampleOfU, ctor);
        ilg.Emit(OpCodes.Newobj, ctorOfU);
        // Store the instance in the local variable; load it
        // again, and load the parameter of genMethod.
        ilg.Emit(OpCodes.Stloc_0); 
        ilg.Emit(OpCodes.Ldloc_0); 
        ilg.Emit(OpCodes.Ldarg_0);
        // In order to store the value in the field of the
        // instance of Sample<U>, it is necessary to have 
        // a FieldInfo representing the field of the 
        // constructed type. Use TypeBuilder.GetField to 
        // obtain this FieldInfo.
        FieldInfo FieldOfU = TypeBuilder.GetField(
            SampleOfU, myField);
        // Store the value in the field. 
        ilg.Emit(OpCodes.Stfld, FieldOfU);
        // Load the instance, load the field value, box it
        // (specifying the type of the type parameter, U), and
        // print it.
        ilg.Emit(OpCodes.Ldloc_0);
        ilg.Emit(OpCodes.Ldfld, FieldOfU);
        ilg.Emit(OpCodes.Box, methodParams[0]);
        MethodInfo writeLineObj = 
            typeof(Console).GetMethod("WriteLine", 
                new Type[] { typeof(object) });
        ilg.EmitCall(OpCodes.Call, writeLineObj, null);
        ilg.Emit(OpCodes.Ret);

        // Emit an entry point method; this must be in a
        // non-generic type.
        TypeBuilder dummy = myModule.DefineType("Dummy", 
            TypeAttributes.Class | TypeAttributes.NotPublic);
        MethodBuilder entryPoint = dummy.DefineMethod("Main", 
            MethodAttributes.Public | MethodAttributes.Static,
            null, null);
        ilg = entryPoint.GetILGenerator();
        // In order to call the static generic method GM, it is
        // necessary to create a constructed type from the 
        // generic type definition for Sample. This can be any
        // constructed type; in this case Sample<int> is used.
        Type SampleOfInt = 
            myType.MakeGenericType( typeof(int) );
        // Next get a MethodInfo representing the static generic
        // method GM on type Sample<int>.
        MethodInfo SampleOfIntGM = TypeBuilder.GetMethod(SampleOfInt, 
            genMethod);
        // Next get a MethodInfo for GM<string>, which is the 
        // instantiation of GM that Main calls.
        MethodInfo GMOfString = 
            SampleOfIntGM.MakeGenericMethod( typeof(string) );
        // Finally, emit the call. Push a string onto
        // the stack, as the argument for the generic method.
        ilg.Emit(OpCodes.Ldstr, "Hello, world!");
        ilg.EmitCall(OpCodes.Call, GMOfString, null);
        ilg.Emit(OpCodes.Ret);

        myType.CreateType();
        dummy.CreateType();
        myAssembly.SetEntryPoint(entryPoint);
        myAssembly.Save(myAsmName.Name + ".exe");

        Console.WriteLine(myAsmName.Name + ".exe has been saved.");
    }
}
Imports System
Imports System.Reflection
Imports System.Reflection.Emit

' Compare the MSIL in this class to the MSIL
' generated by the Reflection.Emit code in class
' Example.
Public Class Sample(Of T)
    Public Field As T
    Public Shared Sub GM(Of U)(ByVal val As U)
        Dim s As New Sample(Of U)
        s.Field = val
        Console.WriteLine(s.Field)
    
    End Sub
End Class 

Public Class Example
    
    Public Shared Sub Main() 
        Dim myDomain As AppDomain = AppDomain.CurrentDomain
        Dim myAsmName As New AssemblyName("TypeBuilderGetFieldExample")
        Dim myAssembly As AssemblyBuilder = _
            myDomain.DefineDynamicAssembly(myAsmName, _
                AssemblyBuilderAccess.Save)
        Dim myModule As ModuleBuilder = _
            myAssembly.DefineDynamicModule(myAsmName.Name, _
                myAsmName.Name & ".exe")
        
        ' Define the sample type.
        Dim myType As TypeBuilder = myModule.DefineType( _
            "Sample", _
            TypeAttributes.Class Or TypeAttributes.Public)
        
        ' Add a type parameter, making the type generic.
        Dim typeParamNames() As String = { "T" }
        Dim typeParams As GenericTypeParameterBuilder() = _
            myType.DefineGenericParameters(typeParamNames)
        
        ' Define a default constructor. Normally it would 
        ' not be necessary to define the default constructor,
        ' but in this case it is needed for the call to
        ' TypeBuilder.GetConstructor, which gets the default
        ' constructor for the generic type constructed from 
        ' Sample(Of T), in the generic method GM(Of U).
        Dim ctor As ConstructorBuilder = _
            myType.DefineDefaultConstructor( _
                MethodAttributes.PrivateScope Or MethodAttributes.Public _
                Or MethodAttributes.HideBySig Or MethodAttributes.SpecialName _
                Or MethodAttributes.RTSpecialName)
        
        ' Add a field of type T, with the name Field.
        Dim myField As FieldBuilder = myType.DefineField( _
            "Field", typeParams(0), FieldAttributes.Public)
        
        ' Add a method and make it generic, with a type 
        ' parameter named U. Note how similar this is to 
        ' the way Sample is turned into a generic type. The
        ' method has no signature, because the type of its
        ' only parameter is U, which is not yet defined.
        Dim genMethod As MethodBuilder = _
            myType.DefineMethod("GM", _
                MethodAttributes.Public Or MethodAttributes.Static)
        Dim methodParamNames() As String = { "U" }
        Dim methodParams As GenericTypeParameterBuilder() = _
            genMethod.DefineGenericParameters(methodParamNames)

        ' Now add a signature for genMethod, specifying U
        ' as the type of the parameter. There is no return value
        ' and no custom modifiers.
        genMethod.SetSignature(Nothing, Nothing, Nothing, _
            New Type() { methodParams(0) }, Nothing, Nothing)
        
        ' Emit a method body for the generic method.
        Dim ilg As ILGenerator = genMethod.GetILGenerator()
        ' Construct the type Sample(Of U) using MakeGenericType.
        Dim SampleOfU As Type = _
            myType.MakeGenericType(methodParams(0))
        ' Create a local variable to store the instance of
        ' Sample(Of U).
        ilg.DeclareLocal(SampleOfU)
        ' Call the default constructor. Note that it is 
        ' necessary to have the default constructor for the
        ' constructed generic type Sample(Of U); use the 
        ' TypeBuilder.GetConstructor method to obtain this 
        ' constructor.
        Dim ctorOfU As ConstructorInfo = _
            TypeBuilder.GetConstructor(SampleOfU, ctor)
        ilg.Emit(OpCodes.Newobj, ctorOfU)
        ' Store the instance in the local variable; load it
        ' again, and load the parameter of genMethod.
        ilg.Emit(OpCodes.Stloc_0)
        ilg.Emit(OpCodes.Ldloc_0)
        ilg.Emit(OpCodes.Ldarg_0)
        ' In order to store the value in the field of the
        ' instance of Sample(Of U), it is necessary to have 
        ' a FieldInfo representing the field of the 
        ' constructed type. Use TypeBuilder.GetField to 
        ' obtain this FieldInfo.
        Dim FieldOfU As FieldInfo = _
            TypeBuilder.GetField(SampleOfU, myField)
        ' Store the value in the field. 
        ilg.Emit(OpCodes.Stfld, FieldOfU)
        ' Load the instance, load the field value, box it
        ' (specifying the type of the type parameter, U), 
        ' and print it.
        ilg.Emit(OpCodes.Ldloc_0)
        ilg.Emit(OpCodes.Ldfld, FieldOfU)
        ilg.Emit(OpCodes.Box, methodParams(0))
        Dim writeLineObj As MethodInfo = _
            GetType(Console).GetMethod("WriteLine", _
                New Type() {GetType(Object)})
        ilg.EmitCall(OpCodes.Call, writeLineObj, Nothing)
        ilg.Emit(OpCodes.Ret)
        
        ' Emit an entry point method; this must be in a
        ' non-generic type.
        Dim dummy As TypeBuilder = _
            myModule.DefineType("Dummy", _
                TypeAttributes.Class Or TypeAttributes.NotPublic)
        Dim entryPoint As MethodBuilder = _
            dummy.DefineMethod("Main", _
                MethodAttributes.Public Or MethodAttributes.Static, _
                Nothing, Nothing)
        ilg = entryPoint.GetILGenerator()
        ' In order to call the static generic method GM, it is
        ' necessary to create a constructed type from the 
        ' generic type definition for Sample. This can be ANY
        ' constructed type; in this case Sample(Of Integer)
        ' is used.
        Dim SampleOfInt As Type = _
            myType.MakeGenericType(GetType(Integer))
        ' Next get a MethodInfo representing the static generic
        ' method GM on type Sample(Of Integer).
        Dim SampleOfIntGM As MethodInfo = _
            TypeBuilder.GetMethod(SampleOfInt, genMethod)
        ' Next get a MethodInfo for GM(Of String), which is the 
        ' instantiation of generic method GM that is called
        ' by Sub Main.
        Dim GMOfString As MethodInfo = _
            SampleOfIntGM.MakeGenericMethod(GetType(String))
        ' Finally, emit the call. Push a string onto
        ' the stack, as the argument for the generic method.
        ilg.Emit(OpCodes.Ldstr, "Hello, world!")
        ilg.EmitCall(OpCodes.Call, GMOfString, Nothing)
        ilg.Emit(OpCodes.Ret)
        
        myType.CreateType()
        dummy.CreateType()
        myAssembly.SetEntryPoint(entryPoint)
        myAssembly.Save(myAsmName.Name & ".exe")
        
        Console.WriteLine(myAsmName.Name & ".exe has been saved.")
    
    End Sub 
End Class 

注釈

GetConstructorメソッドを取得する方法を提供する、ConstructorInfoでジェネリック型定義が表される構築されたジェネリック型のコンス トラクターを表すオブジェクトをTypeBuilderオブジェクト。The GetConstructor method provides a way to get a ConstructorInfo object that represents a constructor of a constructed generic type whose generic type definition is represented by a TypeBuilder object.

などがあるとします、TypeBuilderオブジェクト型を表すG<T>c# 構文で (G(Of T) Visual basic でgeneric <T> ref class GC++ で) とConstructorBuilderのコンス トラクターを表すオブジェクトをG<T>します。For example, suppose you have a TypeBuilder object that represents the type G<T> in C# syntax (G(Of T) in Visual Basic, generic <T> ref class G in C++) and a ConstructorBuilder object that represents a constructor of G<T>. ものとしますG<T>型パラメーターを持つジェネリック メソッドを持つU構築された型のインスタンスを作成するG<U>します。Suppose that G<T> has a generic method with type parameter U that creates an instance of the constructed type G<U>. 構築された型のインスタンスを作成するコードを生成するためにする必要があります、ConstructorInfoつまりのこの構築された型のコンス トラクターを表すオブジェクトのインスタンスを作成するG<U>します。In order to emit the code to create an instance of the constructed type, you need a ConstructorInfo object that represents the constructor of this constructed type - in other words, that creates an instance of G<U>. これを行うには、最初に呼び出す、MakeGenericTypeメソッドをTypeBuilderオブジェクトを指定する、GenericTypeParameterBuilderを表すオブジェクトをU型引数として。To do this, first call the MakeGenericType method on the TypeBuilder object, specifying the GenericTypeParameterBuilder object that represents U as the type argument. 呼び出して、GetConstructorメソッドの戻り値をMakeGenericTypeメソッド パラメーターとしてtypeConstructorBuilderのコンス トラクターを表すオブジェクトをG<U>パラメーターとしてconstructorします。Then call the GetConstructor method with the return value of the MakeGenericType method as parameter type and the ConstructorBuilder object that represents the constructor of G<U> as parameter constructor. 戻り値は、ConstructorInfoオブジェクト、関数呼び出しを生成する必要があります。The return value is the ConstructorInfo object you need to emit the function call. コード例では、このシナリオを示します。The code example demonstrates this scenario.

適用対象