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Type.DeclaringType Property

Gets the type that declares the current nested type or generic type parameter.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

public override Type DeclaringType { get; }

Property Value

Type: System.Type
A Type object representing the enclosing type, if the current type is a nested type; or the generic type definition, if the current type is a type parameter of a generic type; or the type that declares the generic method, if the current type is a type parameter of a generic method; otherwise, null.

Implements

_Type.DeclaringType
_MemberInfo.DeclaringType

If the current Type object represents a type parameter of a generic type, this property returns the generic type definition.

If the current Type object represents a type parameter of a generic method, this property returns the type that contains the generic method definition. If the type is generic, the generic type definition is returned. That is, the following code returns the generic type definition of the List<T> generic class, which contains the ConvertAll<TOutput> generic method:

Type t = typeof(List<string>).GetMethod("ConvertAll").GetGenericArguments()[0].DeclaringType;

If the current Type represents a type parameter in the definition of a generic type or generic method, the DeclaringType and DeclaringMethod properties identify the generic type definition or generic method definition where the generic type parameter was originally defined:

  • 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.

  • 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.

  • Getting the DeclaringType property on a type whose IsGenericParameter property is false throws an InvalidOperationException.

This example displays the declaring type of a method in a derived class.

using System;
using System.Reflection;

public abstract class dtype 
{

    public abstract class MyClassA 
    {
        public abstract int m(); 
    }

    public abstract class MyClassB : MyClassA 
    {
    }

    public static void Main(string[] args) 
    { 
        Console.WriteLine("The declaring type of m is {0}.",
            typeof(MyClassB).GetMethod("m").DeclaringType);
    }
}

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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