IsAbstract Property

Type.IsAbstract Property

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Gets a value indicating whether the Type is abstract and must be overridden.

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

'Declaration
Public ReadOnly Property IsAbstract As Boolean

Property Value

Type: System.Boolean
true if the Type is abstract; otherwise, false.

If the current Type represents a type parameter in the definition of a generic type or generic method, this property always returns false.

The following example returns true if the specified object is abstract; otherwise, it returns false.


Imports System.Reflection
Public MustInherit Class MyMustInheritClass
End Class 'MyMustInheritClass
Public Class [MyClass]
End Class '[MyClass]
Public Class Example
   Public Shared Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
      Try
         ' Check whether the return type of MyMustInheritClass is MustInherit or not.
         outputBlock.Text &= ControlChars.NewLine + "Checking whether the type is MustInherit." + ControlChars.NewLine & vbCrLf

         If GetType([MyMustInheritClass]).IsAbstract = True Then
            outputBlock.Text += String.Format("MyMustInheritClass is {0}", "a MustInherit class.") & vbCrLf
         Else
            outputBlock.Text += String.Format("MyMustInheritClass is {0}", "not a MustInherit class.") & vbCrLf
         End If
         ' Check whether the return type of MyClass is MustInherit or not.
         If GetType([MyClass]).IsAbstract = True Then
            outputBlock.Text += String.Format("MyClass is {0}", "a MustInherit class.") & vbCrLf
         Else
            outputBlock.Text += String.Format("MyClass is {0}", "not a MustInherit class.") & vbCrLf
         End If
      Catch e As Exception
         outputBlock.Text += String.Format("Exception: {0} " + ControlChars.Cr, e.Message.ToString()) & vbCrLf
      End Try
   End Sub 'Main
End Class 'Type_IsMustInherit


Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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