Type.IsSubclassOf Method
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Determines whether the class represented by the current Type derives from the class represented by the specified Type.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- c
- Type: System.Type
The Type to compare with the current Type.
Return Value
Type: System.Booleantrue 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.
| Exception | Condition |
|---|---|
| ArgumentNullException | 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.
Note: |
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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.
Note: |
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To run this example, see Building examples that have static TextBlock controls for Windows Phone 8. |
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"; } }
Note: