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Type.IsSubclassOf Method

July 28, 2014

Determines whether the class represented by the current Type derives from the class represented by the specified Type.

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

public virtual bool IsSubclassOf(
	Type c


Type: System.Type
The Type to compare with the current Type.

Return Value

Type: System.Boolean
true if the Type represented by the c parameter and the current Type represent classes, and the class represented by the current Type derives from the class represented by c; otherwise, false. This method also returns false if c and the current Type represent the same class.


The c parameter is null.

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.


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 Example
   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
      Class1 myClass = new Class1();
      DerivedC1 myDClass = new DerivedC1();
      Type myClassType = myClass.GetType();
      Type myDClassType = myDClass.GetType();

      // Returns true:
      outputBlock.Text += String.Format("myDClass subclass of myClass: {0}", myDClassType.IsSubclassOf(myClassType)) + "\n";

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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