[ComVisibleAttribute(true)]
public virtual bool IsSubclassOf(
	Type c
)

Implements

The IsSubclassOf method cannot be used to determine whether an interface derives from another interface, or whether a class implements an interface. Use the GetInterface method for that purpose. Note that if a type is dervived from an interface, this method returns true for that type being a subclass of Object.

If the current Type represents a type parameter in the definition of a generic type or generic method, it derives from its class constraint or from System.Object if it has no class constraint.

Note
If the IsSubclassOf is the converse of IsAssignableFrom. That is, if t1.IsSubclassOf(t2) is true, then t2.IsAssignableFrom(t1) is also true.

This method can be overridden by a derived class.

The following example demonstrates the use of the IsSubclassOf method by creating an instance of a class and an instance of its derived class.

using System;

public class Class1 { }
public class DerivedC1 : Class1 { }

class IsSubclassTest
{
    public static void Main()
    {
        Class1 myClass = new Class1();
        DerivedC1 myDClass = new DerivedC1();
        Type myClassType = myClass.GetType();
        Type myDClassType = myDClass.GetType();

        // Returns true:
        Console.WriteLine("myDClass subclass of myClass: {0}", myDClassType.IsSubclassOf(myClassType));
        Console.ReadLine();
    }
}

.NET Framework

.NET Framework Client Profile

Portable Class Library

Windows 8 Release Preview, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 SP2, 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.

Reference