Id Property

AppDomain.Id Property


Gets an integer that uniquely identifies the application domain within the process.

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

public int Id { get; }

Property Value

Type: System.Int32

An integer that identifies the application domain.

The following code example creates a second application domain and displays information about the default domain and the new domain.

using System;
using System.Reflection;

public class Example
    // The following attribute indicates to the loader that assemblies
    // in the global assembly cache should be shared across multiple 
    // application domains.
    [LoaderOptimizationAttribute( LoaderOptimization.MultiDomainHost)]
    public static void Main()
        // Show information for the default application domain.

        // Create a new application domain and display its information.
        AppDomain newDomain = AppDomain.CreateDomain("MyMultiDomain");
        newDomain.DoCallBack(new CrossAppDomainDelegate(ShowDomainInfo));

    // This method has the same signature as the CrossAppDomainDelegate,
    // so that it can be executed easily in the new application domain.
    public static void ShowDomainInfo()
        AppDomain ad = AppDomain.CurrentDomain;
        Console.WriteLine("FriendlyName: {0}", ad.FriendlyName);
        Console.WriteLine("Id: {0}", ad.Id);
        Console.WriteLine("IsDefaultAppDomain: {0}", ad.IsDefaultAppDomain());

.NET Framework
Available since 2.0
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