Type.IsGenericParameter 属性

定义

获取一个值,该值指示当前 Type 是否表示泛型类型或方法的定义中的类型参数。Gets a value indicating whether the current Type represents a type parameter in the definition of a generic type or method.

public:
 virtual property bool IsGenericParameter { bool get(); };
public virtual bool IsGenericParameter { get; }
member this.IsGenericParameter : bool
Public Overridable ReadOnly Property IsGenericParameter As Boolean

属性值

如果 Type 对象表示泛型类型定义或泛型方法定义的类型参数,则为 true;否则为 falsetrue if the Type object represents a type parameter of a generic type definition or generic method definition; otherwise, false.

示例

下面的示例使用 IsGenericParameter 属性测试泛型类型中的泛型类型参数。The following example uses the IsGenericParameter property to test for generic type parameters in a generic type.

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);
      
      // If this is a type parameter, display its
      // position.
      //
      if ( tParam->IsGenericParameter )
      {
         Console::WriteLine(
            L"\t\t{0}\t(unassigned - parameter position {1})",
            tParam, tParam->GenericParameterPosition );
      }
      else
      {
         Console::WriteLine( L"\t\t{0}", tParam );
      }
   }
}
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)
    {
        // If this is a type parameter, display its
        // position.
        //
        if (tParam.IsGenericParameter)
        {
            Console.WriteLine("\t\t{0}\t(unassigned - parameter position {1})",
                tParam,
                tParam.GenericParameterPosition);
        }
        else
        {
            Console.WriteLine("\t\t{0}", tParam);
        }
    }
}
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
        ' If this is a type parameter, display its position.
        '
        If tParam.IsGenericParameter Then
            Console.WriteLine(vbTab & vbTab & tParam.ToString() _
                & vbTab & "(unassigned - parameter position " _
                & tParam.GenericParameterPosition & ")")
        Else
            Console.WriteLine(vbTab & vbTab & tParam.ToString())
        End If
    Next tParam
End If

注解

可以通过调用表示泛型类型定义的 Type 对象的 GetGenericArguments 方法或表示泛型方法定义的 MethodInfo 对象的 GetGenericArguments 方法来获取表示泛型类型参数的 Type 对象。Type objects that represent generic type parameters can be obtained by calling the GetGenericArguments method of a Type object that represents a generic type definition, or the GetGenericArguments method of a MethodInfo object that represents a generic method definition.

  • 对于泛型类型或方法定义,IsGenericParameter 属性返回生成的数组的每个元素的 trueFor a generic type or method definition, the IsGenericParameter property returns true for every element of the resulting array.

  • 对于封闭式构造类型或方法,IsGenericParameter 属性返回 GetGenericArguments 方法返回的数组的每个元素的 falseFor a closed constructed type or method, the IsGenericParameter property returns false for every element of the array returned by the GetGenericArguments method.

  • 对于开放构造的类型或方法,数组的某些元素可能是特定类型,而其他元素可能为类型参数。For an open constructed type or method, some elements of the array might be specific types and others might be type parameters. IsGenericParameter 返回类型参数的类型和 true falseIsGenericParameter returns false for the types and true for the type parameters. ContainsGenericParameters 属性的代码示例演示了混合类型和类型参数的泛型类。The code example for the ContainsGenericParameters property demonstrates a generic class with a mixture of types and type parameters.

有关泛型反射中使用的术语的固定条件列表,请参阅 IsGenericType 属性注解。For a list of the invariant conditions for terms used in generic reflection, see the IsGenericType property remarks.

适用于

另请参阅