C# System API : AppDomain

 AppDomain.CreateDomain

  

using System;
using System.Reflection;
using System.Collections;

class MainClass
{
    public static void Main() 
    {
        AppDomain domain = AppDomain.CreateDomain("Test");

        ArrayList list = new ArrayList();
        list.Add("d");
        list.Add("c");
        list.Add("f");

        domain.SetData("Pets", list);

        foreach (string s in (ArrayList)domain.GetData("Pets"))
        {
            Console.WriteLine("  - " + s);
        }
    }
}

AppDomain.Unload

  
using System;
using System.Runtime.Remoting;
using System.Reflection;

class MainClass
{
  public static void Main() 
  {
    AppDomain d = AppDomain.CreateDomain("NewDomain");
    
    ObjectHandle hobj = d.CreateInstance("AnotherDomain", "SimpleObject");
    SimpleObject so = (SimpleObject) hobj.Unwrap();
    Console.WriteLine(so.Display("make this uppercase"));

    AppDomain.Unload(d);
    Console.WriteLine(so.Display("make this uppercase"));

  }

}


[Serializable]
public class SimpleObject 
{

  public String Display(String inString)
  {
    return(inString.ToUpper());
  }

}

AppDomain.SetPrincipalPolicy

 

using System;
using System.Security;
using System.Security.Principal;
using System.Security.Permissions;

class Program {
    static void Main(string[] args) {
        AppDomain.CurrentDomain.SetPrincipalPolicy(PrincipalPolicy.WindowsPrincipal);
        try {
            ShowMessage();
        } catch (SecurityException exception) {
            Console.WriteLine(exception.Message);
        }
    }

    [PrincipalPermissionAttribute(SecurityAction.Demand,Role = "BUILTIN\\Users")]
    static void ShowMessage() {
        Console.WriteLine("The current principal is logged in locally ");
        Console.WriteLine("(they are a member of the local Users group)");
    }
}

AppDomain.SetData

 

using System; 
using System.Reflection;
using System.Collections;

class ListModifier{
    public ListModifier()
    {
        ArrayList list = (ArrayList)AppDomain.CurrentDomain.GetData("Pets");
        list.Add("turtle");
    }
}
class MainClass{
      public static void Main(){
          AppDomain domain = AppDomain.CreateDomain("Test");

          ArrayList list = new ArrayList();
          list.Add("dog");
          list.Add("cat");
          list.Add("fish");

          domain.SetData("Pets", list);

          domain.CreateInstance("MainClass","Apress.VisualCSharpRecipes.Chapter03.ListModifier");

          foreach (string s in (ArrayList)domain.GetData("Pets")) {
              Console.WriteLine(s);
          }
      }
}

AppDomain.ProcessExit

  

using System;
using System.Reflection;
using System.Windows.Forms;
  
public class MainClass
{
  public static void defaultAD_DomainUnload(object sender, EventArgs e)
  {
    Console.WriteLine("Unloaded defaultAD!");
  }
  private static void defaultAD_ProcessExit(object sender, EventArgs e)
  {
    Console.WriteLine("Unloaded defaultAD!");
  }

  public static int Main(string[] args)
  {
    AppDomain defaultAD = AppDomain.CreateDomain("SecondAppDomain");

    defaultAD.DomainUnload += new EventHandler(defaultAD_DomainUnload);
    defaultAD.ProcessExit +=new EventHandler(defaultAD_ProcessExit);

    // Now unload anotherAD.
    AppDomain.Unload(defaultAD);

    return 0;
  }
}

AppDomain.OnUnhandledException

 

using System;

public class Starter {
    public static void Main() {
        AppDomain.CurrentDomain.UnhandledException += new UnhandledExceptionEventHandler(OnUnhandledException);
        int vara = 5, varb = 0;
        vara /= varb;
    }

    public static void OnUnhandledException(
            object sender, UnhandledExceptionEventArgs e) {
        string application_name = sender.ToString();
        Exception except = (Exception)e.ExceptionObject;
        string errormessage = "Application " + application_name +
            " [ Exception " + except.Message + " ]";
        Console.WriteLine(errormessage);
    }
}

AppDomain.GetData

 
using System; 
using System.Reflection;
using System.Collections;

class ListModifier{
    public ListModifier()
    {
        ArrayList list = (ArrayList)AppDomain.CurrentDomain.GetData("Pets");
        list.Add("turtle");
    }
}
class MainClass{
      public static void Main(){
          AppDomain domain = AppDomain.CreateDomain("Test");

          ArrayList list = new ArrayList();
          list.Add("dog");
          list.Add("cat");
          list.Add("fish");

          domain.SetData("Pets", list);

          domain.CreateInstance("MainClass","Namespace.Namespace.ListModifier");

          foreach (string s in (ArrayList)domain.GetData("Pets")) {
              Console.WriteLine(s);
          }
      }
}

AppDomain.GetAssemblies

  
using System;
using System.Reflection;
using System.Windows.Forms;
  
public class MainClass
{
  public static int Main(string[] args)
  {
    AppDomain defaultAD = AppDomain.CurrentDomain;
    Console.WriteLine("This call loaded System.Windows.Forms.dll and System.dll");

    Assembly[] loadedAssemblies = defaultAD.GetAssemblies();      
    Console.WriteLine("Here are the assemblies loaded in {0}\n",defaultAD.FriendlyName);
    foreach(Assembly a in loadedAssemblies)
    {
      Console.WriteLine("-> Name: {0}", a.GetName().Name);
      Console.WriteLine("-> Version: {0}\n", a.GetName().Version);
    }

    return 0;
  }
}

AppDomain.FriendlyName

 
using System;
using System.Collections.Generic;
using System.Text;

class Program {
    static void Main(string[] args) {
        AppDomain currentDomain = AppDomain.CurrentDomain;
        Console.WriteLine(currentDomain.FriendlyName);
        AppDomain secondDomain = AppDomain.CreateDomain("New AppDomain");
        secondDomain.CreateInstance("AssemblyA", "AppDomains.Demo", true,System.Reflection.BindingFlags.CreateInstance, null, new object[] { 7, 3 }, null, null, null);
    }
}

AppDomain.DomainUnload

  

using System;
using System.Reflection;
using System.Windows.Forms;
  
public class MainClass
{
  public static void defaultAD_DomainUnload(object sender, EventArgs e)
  {
    Console.WriteLine("Unloaded defaultAD!");
  }
  private static void defaultAD_ProcessExit(object sender, EventArgs e)
  {
    Console.WriteLine("Unloaded defaultAD!");
  }

  public static int Main(string[] args)
  {
    AppDomain defaultAD = AppDomain.CreateDomain("SecondAppDomain");

    defaultAD.DomainUnload += new EventHandler(defaultAD_DomainUnload);
    defaultAD.ProcessExit +=new EventHandler(defaultAD_ProcessExit);

    // Now unload anotherAD.
    AppDomain.Unload(defaultAD);

    return 0;
  }
}

AppDomain.DoCallBack

  

using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.Globalization;
using System.IO;
using System.Reflection;
using System.Security;
using System.Security.Permissions;
using System.Security.Policy;

public class MainClass
{
    public static void Main()
    {
        List<AppDomain> ads = new List<AppDomain>();
        for (int i = 0; i < 10; i++)
        {
            AppDomain ad = AppDomain.CreateDomain(i.ToString());
            ad.DoCallBack(delegate { Type t = typeof(Uri); });
            ads.Add(ad);
        }
        Console.WriteLine("After loading System.dll into 10 AppDomains: {0}", Environment.WorkingSet);
    }

}

AppDomain.DefineDynamicAssembly

  

using System;
using System.Reflection;
using System.Reflection.Emit;

public class MainClass 
{

    public static void Main() 
    {
        AppDomain ad = AppDomain.CurrentDomain;

        AssemblyName an = new AssemblyName();
        an.Name = "DynamicRandomAssembly";
        AssemblyBuilder ab = ad.DefineDynamicAssembly(an, AssemblyBuilderAccess.Run);

        ModuleBuilder mb = ab.DefineDynamicModule("RandomModule");

        TypeBuilder tb = mb.DefineType("DynamicRandomClass",TypeAttributes.Public);

        Type returntype = typeof(int);
        Type[] paramstype = new Type[0];
        MethodBuilder methb=tb.DefineMethod("DynamicRandomMethod", MethodAttributes.Public, returntype, paramstype);

        ILGenerator gen = methb.GetILGenerator();
        gen.Emit(OpCodes.Ldc_I4, 1);
        gen.Emit(OpCodes.Ret);

        Type t = tb.CreateType();

        Object o = Activator.CreateInstance(t);
        Object[] aa = new Object[0];
        MethodInfo m = t.GetMethod("DynamicRandomMethod");
        int i = (int) m.Invoke(o, aa);
        Console.WriteLine("Method {0} in Class {1} returned {2}",m, t, i);

    }
}

using System;

public class DynamicRandomClass
{
    public int DynamicRandomMethod()
    {
        return 1;
    }
}

AppDomain.CurrentDomain

  
using System;

class MainClass
{
    public static void Main(string[] args)
    {
        if (AppDomain.CurrentDomain.FriendlyName != "NewAppDomain")
        {
            AppDomain domain = AppDomain.CreateDomain("NewAppDomain");

            domain.ExecuteAssembly("MainClass.exe", null, args);
        }

        foreach (string s in args)
        {
            Console.WriteLine(AppDomain.CurrentDomain.FriendlyName + " : " + s);
        }
    }
}

AppDomain.CurrentDomain.FriendlyName

  

using System;

class MainClass
{
  public static void Main() 
  {
    AppDomain d = AppDomain.CreateDomain("NewDomain");
    Console.WriteLine(AppDomain.CurrentDomain.FriendlyName);
    Console.WriteLine(d.FriendlyName);
  }
}

AppDomain.CreateInstanceFromAndUnwrap

  
using System;

[Serializable]
public class MyClass 
{
    public string HomeAppDomain 
    {
        get 
        {
            return AppDomain.CurrentDomain.FriendlyName;
        }
    }
}
public class MainClass
{
    public static void Main(string[] args)
    {
        AppDomain newDomain = AppDomain.CreateDomain("My New AppDomain");

        MyClass mbvObject = (MyClass)newDomain.CreateInstanceFromAndUnwrap(
                "MainClass.exe", 
                "MyClass");

        Console.WriteLine("AppDomain of MBV object = {0}", mbvObject.HomeAppDomain);


    }
}

AppDomain.CreateInstanceAndUnwrap

  

using System;
using System.Runtime.Remoting;

class MainClass
{
  [MTAThread]
  static void Main(string[] args)
  {
    AppDomain Domain2 = AppDomain.CreateDomain("AppDomainB");
    MainClass MyMyClass = (MainClass)Domain2.CreateInstanceAndUnwrap("YourNameSpace", "YourClassName");

  }
}

AppDomain.CreateInstance

  
using System;
using System.Runtime.Remoting;
using System.Reflection;

class MainClass
{

  public static void Main() 
  {
    AppDomain d = AppDomain.CreateDomain("NewDomain");
    
    ObjectHandle hobj = d.CreateInstance("AnotherDomain", "SimpleObject");
    SimpleObject so = (SimpleObject) hobj.Unwrap();
    Console.WriteLine(so.Display("make this uppercase"));
  }

}


[Serializable]
public class SimpleObject 
{

  public String Display(String inString)
  {
    return(inString.ToUpper());
  }

}