Type.GenericParameterPosition Type.GenericParameterPosition Type.GenericParameterPosition Type.GenericParameterPosition Property

정의

Type 개체가 제네릭 형식이나 제네릭 메서드의 형식 매개 변수를 나타내는 경우, 해당 매개 변수가 선언된 제네릭 형식 또는 메서드의 형식 매개 변수 목록에서 해당 형식 매개 변수가 있는 위치를 가져옵니다.Gets the position of the type parameter in the type parameter list of the generic type or method that declared the parameter, when the Type object represents a type parameter of a generic type or a generic method.

public:
 virtual property int GenericParameterPosition { int get(); };
public virtual int GenericParameterPosition { get; }
member this.GenericParameterPosition : int
Public Overridable ReadOnly Property GenericParameterPosition As Integer

속성 값

형식 매개 변수가 정의된 제네릭 형식 또는 메서드의 형식 매개 변수 목록에서 해당 형식 매개 변수가 있는 위치입니다.The position of a type parameter in the type parameter list of the generic type or method that defines the parameter. 위치 번호는 0부터 시작합니다.Position numbers begin at 0.

예외

현재 형식이 형식 매개 변수를 나타내지 않습니다.The current type does not represent a type parameter. 즉, IsGenericParameterfalse를 반환합니다.That is, IsGenericParameter returns false.

예제

다음 예제에서는 두 형식 매개 변수를 사용 하 여 제네릭 클래스를 정의 하 고 첫 번째 클래스에서 파생 되는 두 번째 제네릭 클래스를 정의 합니다.The following example defines a generic class with two type parameters and defines a second generic class that derives from the first class. 파생된 클래스의 기본 클래스에 두 개의 형식 인수: 첫 번째는 Int32, 두 번째는 파생 된 형식의 형식 매개 변수입니다.The derived class's base class has two type arguments: the first is Int32, and the second is a type parameter of the derived type. 보고 된 위치를 포함 하 여 이러한 제네릭 클래스에 대 한 정보를 표시 하는 예제에는 GenericParameterPosition 속성입니다.The example displays information about these generic classes, including the positions reported by the GenericParameterPosition property.

using namespace System;
using namespace System::Reflection;
using namespace System::Collections::Generic;

// Define a base class with two type parameters.
generic< class T,class U >
public ref class Base {};

// Define a derived class. The derived class inherits from a constructed
// class that meets the following criteria:
//   (1) Its generic type definition is Base<T, U>.
//   (2) It specifies int for the first type parameter.
//   (3) For the second type parameter, it uses the same type that is used
//       for the type parameter of the derived class.
// Thus, the derived class is a generic type with one type parameter, but
// its base class is an open constructed type with one type argument and
// one type parameter.
generic<class V>
public ref class Derived : Base<int,V> {};

public ref class Test
{
public:
    static void Main()
    {
        Console::WriteLine( 
            L"\r\n--- Display a generic type and the open constructed");
        Console::WriteLine(L"    type from which it is derived.");
      
        // Create a Type object representing the generic type definition
        // for the Derived type. Note the absence of type arguments.
        //
        Type^ derivedType = Derived::typeid;
        DisplayGenericTypeInfo(derivedType);
      
        // Display its open constructed base type.
        DisplayGenericTypeInfo(derivedType->BaseType);
    }


private:
    static void DisplayGenericTypeInfo(Type^ t)
    {
        Console::WriteLine(L"\r\n{0}", t);
        Console::WriteLine(L"\tIs this a generic type definition? {0}",
            t->IsGenericTypeDefinition);
        Console::WriteLine(L"\tIs it a generic type? {0}", t->IsGenericType);
        Console::WriteLine(L"\tDoes it have unassigned generic parameters? {0}",
            t->ContainsGenericParameters);
        if (t->IsGenericType)
        {
         
            // If this is a generic type, display the type arguments.
            //
            array<Type^>^typeArguments = t->GetGenericArguments();
            Console::WriteLine(L"\tList type arguments ({0}):",
                typeArguments->Length);
            System::Collections::IEnumerator^ myEnum = 
                typeArguments->GetEnumerator();
            while (myEnum->MoveNext())
            {
                Type^ tParam = safe_cast<Type^>(myEnum->Current);
            
                // IsGenericParameter is true only for generic type
                // parameters.
                //
                if (tParam->IsGenericParameter)
                {
                    Console::WriteLine( 
                        L"\t\t{0}  (unassigned - parameter position {1})", 
                        tParam, tParam->GenericParameterPosition);
                }
                else
                {
                    Console::WriteLine(L"\t\t{0}", tParam);
                }
            }
        }
    }
};

int main()
{
    Test::Main();
}

/* This example produces the following output:

--- Display a generic type and the open constructed
    type from which it is derived.

Derived`1[V]
        Is this a generic type definition? True
        Is it a generic type? True
        Does it have unassigned generic parameters? True
        List type arguments (1):
                V  (unassigned - parameter position 0)

Base`2[System.Int32,V]
        Is this a generic type definition? False
        Is it a generic type? True
        Does it have unassigned generic parameters? True
        List type arguments (2):
                System.Int32
                V  (unassigned - parameter position 0)
 */
using System;
using System.Reflection;
using System.Collections.Generic;

// Define a base class with two type parameters.
public class Base<T, U> { }

// Define a derived class. The derived class inherits from a constructed
// class that meets the following criteria:
//   (1) Its generic type definition is Base<T, U>.
//   (2) It specifies int for the first type parameter.
//   (3) For the second type parameter, it uses the same type that is used
//       for the type parameter of the derived class.
// Thus, the derived class is a generic type with one type parameter, but
// its base class is an open constructed type with one type argument and
// one type parameter.
public class Derived<V> : Base<int, V> { }

public class Test
{
    public static void Main()
    {
        Console.WriteLine(
            "\r\n--- Display a generic type and the open constructed");
        Console.WriteLine("    type from which it is derived.");

        // Create a Type object representing the generic type definition 
        // for the Derived type, by omitting the type argument. (For
        // types with multiple type parameters, supply the commas but
        // omit the type arguments.) 
        //
        Type derivedType = typeof(Derived<>);
        DisplayGenericTypeInfo(derivedType);

        // Display its open constructed base type.
        DisplayGenericTypeInfo(derivedType.BaseType);
    }

    private static void DisplayGenericTypeInfo(Type t)
    {
        Console.WriteLine("\r\n{0}", t);

        Console.WriteLine("\tIs this a generic type definition? {0}", 
            t.IsGenericTypeDefinition);

        Console.WriteLine("\tIs it a generic type? {0}", 
            t.IsGenericType);

        Console.WriteLine("\tDoes it have unassigned generic parameters? {0}", 
            t.ContainsGenericParameters);

        if (t.IsGenericType)
        {
            // If this is a generic type, display the type arguments.
            //
            Type[] typeArguments = t.GetGenericArguments();

            Console.WriteLine("\tList type arguments ({0}):", 
                typeArguments.Length);

            foreach (Type tParam in typeArguments)
            {
                // IsGenericParameter is true only for generic type
                // parameters.
                //
                if (tParam.IsGenericParameter)
                {
                    Console.WriteLine(
                        "\t\t{0}  (unassigned - parameter position {1})",
                        tParam,
                        tParam.GenericParameterPosition);
                }
                else
                {
                    Console.WriteLine("\t\t{0}", tParam);
                }
            }
        }
    }
}

/* This example produces the following output:

--- Display a generic type and the open constructed
    type from which it is derived.

Derived`1[V]
        Is this a generic type definition? True
        Is it a generic type? True
        Does it have unassigned generic parameters? True
        List type arguments (1):
                V  (unassigned - parameter position 0)

Base`2[System.Int32,V]
        Is this a generic type definition? False
        Is it a generic type? True
        Does it have unassigned generic parameters? True
        List type arguments (2):
                System.Int32
                V  (unassigned - parameter position 0)
 */
Imports System.Reflection
Imports System.Collections.Generic

' Define a base class with two type parameters.
Public Class Base(Of T, U)
End Class

' Define a derived class. The derived class inherits from a constructed
' class that meets the following criteria:
'   (1) Its generic type definition is Base<T, U>.
'   (2) It uses int for the first type parameter.
'   (3) For the second type parameter, it uses the same type that is used
'       for the type parameter of the derived class.
' Thus, the derived class is a generic type with one type parameter, but
' its base class is an open constructed type with one assigned type
' parameter and one unassigned type parameter.
Public Class Derived(Of V)
    Inherits Base(Of Integer, V)
End Class

Public Class Test
    
    Public Shared Sub Main() 
        Console.WriteLine(vbCrLf _
            & "--- Display a generic type and the open constructed")
        Console.WriteLine("    type from which it is derived.")
        
        ' Create a Type object representing the generic type definition 
        ' for the Derived type, by omitting the type argument. (For
        ' types with multiple type parameters, supply the commas but
        ' omit the type arguments.) 
        '
        Dim derivedType As Type = GetType(Derived(Of ))
        DisplayGenericTypeInfo(derivedType)
        
        ' Display its open constructed base type.
        DisplayGenericTypeInfo(derivedType.BaseType)
    
    End Sub
    
    Private Shared Sub DisplayGenericTypeInfo(ByVal t As Type) 
        Console.WriteLine(vbCrLf & "{0}", t)
        
        Console.WriteLine(vbTab & "Is this a generic type definition? " _
            & t.IsGenericTypeDefinition)
        
        Console.WriteLine(vbTab & "Is it a generic type? " _
            & t.IsGenericType)
        
        Console.WriteLine(vbTab _
            & "Does it have unassigned generic parameters? " _
            & t.ContainsGenericParameters)
        
        If t.IsGenericType Then
            ' If this is a generic type, display the type arguments.
            '
            Dim typeArguments As Type() = t.GetGenericArguments()
            
            Console.WriteLine(vbTab & "List type arguments (" _
                & typeArguments.Length & "):")
            
            For Each tParam As Type In typeArguments
                ' IsGenericParameter is true only for generic type
                ' parameters.
                '
                If tParam.IsGenericParameter Then
                    Console.WriteLine(vbTab & vbTab & tParam.ToString() _
                        & "  (unassigned - parameter position " _
                        & tParam.GenericParameterPosition & ")")
                Else
                    Console.WriteLine(vbTab & vbTab & tParam.ToString())
                End If
            Next tParam
        End If
    
    End Sub
End Class

' This example produces the following output:
'
'--- Display a generic type and the open constructed
'    type from which it is derived.
'
'Derived`1[V]
'        Is this a generic type definition? True
'        Is it a generic type? True
'        Does it have unassigned generic parameters? True
'        List type arguments (1):
'                V  (unassigned - parameter position 0)
'
'Base`2[System.Int32,V]
'        Is this a generic type definition? False
'        Is it a generic type? True
'        Does it have unassigned generic parameters? True
'        List type parameters (2):
'                System.Int32
'                V  (unassigned - parameter position 0)
' 

설명

GenericParameterPosition 속성의 위치를 반환 형식 매개 변수를 제네릭 형식 정의 또는 제네릭 메서드 정의의 매개 변수 목록의 형식 매개 변수에 원래 정의 된 합니다.The GenericParameterPosition property returns the position of a type parameter in the parameter list of the generic type definition or generic method definition where the type parameter was originally defined. 합니다 DeclaringTypeDeclaringMethod 속성 제네릭 형식 또는 메서드 정의 식별 합니다.The DeclaringType and DeclaringMethod properties identify the generic type or method definition:

  • 경우는 DeclaringMethod 속성이 반환을 MethodInfoMethodInfo 제네릭 메서드 정의 나타내며 현재 Type 개체는 제네릭 메서드 정의의 형식 매개 변수를 나타냅니다.If the DeclaringMethod property returns a MethodInfo, that MethodInfo represents a generic method definition, and the current Type object represents a type parameter of that generic method definition.

  • 경우는 DeclaringMethod 속성이 반환 null, 해당 DeclaringType 속성은 항상 반환을 Type 제네릭 형식 정의 나타내며 현재 개체 Type 개체는 제네릭 형식의 형식 매개 변수를 나타냅니다 정의 합니다.If the DeclaringMethod property returns null, then the DeclaringType property always returns a Type object representing a generic type definition, and the current Type object represents a type parameter of that generic type definition.

값에 대 한 올바른 컨텍스트를 지정 하는 GenericParameterPosition 는 제네릭 형식 또는 형식 매개 변수에 속하는 메서드를 식별 하는 데 필요한 속성입니다.To provide the correct context for the value of the GenericParameterPosition property, it is necessary to identify the generic type or method a type parameter belongs to. 예를 들어, 제네릭 메서드의 반환 값을 고려할 GetSomething 다음 코드에서:For example, consider the return value of the generic method GetSomething in the following code:

generic<typename T, typename U> public ref class B { };
generic<typename V> public ref class A
{
public:
    generic<typename X> B<V, X>^ GetSomething()
    {
        return gcnew B<V, X>();
    }
};
public class B<T, U> { }
public class A<V>
{
    public B<V, X> GetSomething<X>()
    {
        return new B<V, X>();
    }
}
Public Class B(Of T, U)
End Class
Public Class A(Of V)
    Public Function GetSomething(Of X)() As B(Of V, X)
        Return New B(Of V, X)()
    End Function
End Class

반환한 형식과 GetSomething 클래스에 제공 된 형식 인수에 따라 달라 집니다 A 하 고 GetSomething 자체입니다.The type returned by GetSomething depends on the type arguments supplied to class A and to GetSomething itself. 가져올 수 있습니다는 MethodInfo 에 대 한 GetSomething는 반환 형식을 가져올 수 있습니다.You can obtain a MethodInfo for GetSomething, and from that you can obtain the return type. 반환 형식의 형식 매개 변수를 검사 하는 경우 GenericParameterPosition 둘 다에 대해 0을 반환 합니다.When you examine the type parameters of the return type, GenericParameterPosition returns 0 for both. 위치가 V 이므로 0 V 클래스에 대 한 형식 매개 변수 목록의 첫 번째 형식 매개 변수는 A합니다.The position of V is 0 because V is the first type parameter in the type parameter list for class A. 위치가 X 이므로 0 X 에 대 한 형식 매개 변수 목록의 첫 번째 형식 매개 변수는 GetSomething합니다.The position of X is 0 because X is the first type parameter in the type parameter list for GetSomething.

참고

호출을 GenericParameterPosition 속성 예외를 발생 하는 경우 현재 Type 형식 매개 변수를 나타내지 않습니다.Calling the GenericParameterPosition property causes an exception if the current Type does not represent a type parameter. 개방형 생성 형식의 형식 인수를 검사할 때 사용 된 IsGenericParameter 형식 매개 변수는 형식이 되 고 설명 하는 속성입니다.When you examine the type arguments of an open constructed type, use the IsGenericParameter property to tell which are type parameters and which are types. IsGenericParameter 속성에서 반환 true ; 형식 매개 변수에 대해 사용할 수 있습니다 합니다 GenericParameterPosition 위치로 사용 하는 메서드를 DeclaringMethodDeclaringType 형식 정의 하는 정의 또는 제네릭 메서드를 확인 하는 속성 .The IsGenericParameter property returns true for a type parameter; you can then use the GenericParameterPosition method to obtain its position and use the DeclaringMethod and DeclaringType properties to determine the generic method or type definition that defines it.

적용 대상

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