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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 bool IsSealed { get; }
/** @property */
public final boolean get_IsSealed ()

public final function get IsSealed () : boolean

Not applicable.

Property Value

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;
namespace SystemType
{
    public class MyClass
    {
        // Declare MyTestClass as sealed.
        sealed public class MyTestClass
        {
        }
        public static void Main(string []args)
        {
            try
            {
                bool myBool = false;
                MyTestClass myTestClassInstance = new MyTestClass();
                // Get the type of myTestClassInstance.
                Type myType = myTestClassInstance.GetType();
                // Get the IsSealed property of the myTestClassInstance.
                myBool = myType.IsSealed;
                Console.WriteLine("\nIs {0} sealed? {1}.", myType.FullName, myBool.ToString());
            }
            catch (Exception e)
            {
                Console.WriteLine("\nAn exception occurred: {0}",e.Message);
            }
        }
    }
}

package SystemType;  
  
import System.*;

public class MyClass
{
    // Declare MyTestClass as sealed.
    final public static class MyTestClass
    {
    } //MyTestClass

    public static void main(String[] args)
    {
        try {
            boolean myBool = false;
            MyTestClass myTestClassInstance = new MyTestClass();

            // Get the type of myTestClassInstance.
            Type myType = myTestClassInstance.GetType();

            // Get the IsSealed property of the myTestClassInstance.
            myBool = myType.get_IsSealed();
            Console.WriteLine("\nIs {0} sealed? {1}.", myType.get_FullName(),
                System.Convert.ToString(myBool));
        }
        catch (System.Exception e) {
            Console.WriteLine("\nAn exception occurred: {0}", e.get_Message());
        }
    } //main
} //MyClass

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

XNA Framework

Supported in: 1.0

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