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.
Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Syntax
Public Overridable Function IsSubclassOf ( _
c As Type _
) As Boolean
public virtual bool IsSubclassOf(
Type c
)
Parameters
- 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.
Exceptions
Exception | Condition |
---|---|
ArgumentNullException | The c parameter is nullNothingnullptra null reference (Nothing in Visual Basic). |
Remarks
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.
Examples
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
To run this example, see Building examples that have static TextBlock controls for Windows Phone 8.
Public Class Class1
End Class
Public Class DerivedC1
Inherits Class1
End Class
Class Example
Public Shared Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
Dim myC1 As Class1 = New Class1
Dim myDClass As DerivedC1 = New DerivedC1
Dim myClassType As Type = myC1.GetType
Dim myDClassType As Type = myDClass.GetType
' Returns true:
outputBlock.Text += String.Format("myDClass subclass of myClass: {0}", myDClassType.IsSubclassOf(myClassType)) & vbCrLf
End Sub
End 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";
}
}
Version Information
Windows Phone OS
Supported in: 8.1, 8.0, 7.1, 7.0
Platforms
Windows Phone