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IsSealed Property

Type.IsSealed Property

Gets a value indicating whether the Type is declared sealed.

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

public bool IsSealed { get; }

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.

using System;

 public class Example
     // Declare InnerClass as sealed. 
     sealed public class InnerClass

     public static void Main()
          InnerClass inner = new InnerClass();
          // Get the type of InnerClass.
          Type innerType = inner.GetType();
          // Get the IsSealed property of  innerClass. 
          bool isSealed = innerType.IsSealed;
          Console.WriteLine("{0} is sealed: {1}.", innerType.FullName, isSealed);
// 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

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Portable Class Library

Supported in: Portable Class Library
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