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Type.IsSealed Property

Gets a value indicating whether the Type is declared sealed.

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

Public ReadOnly Property IsSealed As Boolean

Property Value

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



If the current Type represents a type parameter of a generic type, this property always returns true.

The following example creates an instance of a sealed class, checks for the IsSealed property, and displays the result.

Public Class Example
    ' Declare InnerClass as sealed. 
    Public NotInheritable Class InnerClass
    End Class 

    Public Shared Sub Main()
         Dim inner As New InnerClass()
         ' Get the type of InnerClass. 
         Dim innerType As Type = inner.GetType()
         ' Get the IsSealed property of InnerClass. 
         Dim sealed As Boolean = innerType.IsSealed
         Console.WriteLine("{0} is sealed: {1}.", innerType.FullName, sealed)
    End Sub 
End Class 
' The example displays the following output: 
'       Example+InnerClass is sealed: True.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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