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Type.BaseType Property

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

Gets the type from which the current Type directly inherits.

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

Public MustOverride ReadOnly Property BaseType As Type

Property Value

Type: System.Type
The Type from which the current Type directly inherits, or Nothing if the current Type represents the Object class or an interface.

The base type is the type from which the current type directly inherits. Object is the only type that does not have a base type, therefore Nothing is returned as the base type of Object.

Interfaces inherit from zero or more base interfaces; therefore, this property returns Nothing if the Type object represents an interface. The base interfaces can be determined with GetInterfaces.

If the current Type represents a constructed generic type, the base type reflects the generic arguments. For example, consider the following declarations:

Class B(Of U)
End Class
Class C(Of T)
    Inherits B(Of T)
End Class

For the constructed type C<int> (C(Of Integer) in Visual Basic), the BaseType property returns B<int>.

If the current Type represents a type parameter of a generic type definition, BaseType returns the class constraint, that is, the class the type parameter must inherit. If there is no class constraint, BaseType returns System.Object.

This property is read-only.

The following example demonstrates using the BaseType property.

Class Example

   Public Shared Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
      Dim t As Type = GetType(Integer)
      outputBlock.Text += String.Format("{0} inherits from {1}.", t, t.BaseType) & vbCrLf
   End Sub 'Main
End Class 'TestType

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone