Type instances have different copies in different application domains

Today, let's look at CLR via C #. We can see that the same type will be applied in different applications. Program There are multiple images in the domain, so I wrote a Section Code Verify this situation. Using System;
Using System. Collections. Generic;
Using System. LINQ;
Using System. text;
Using System. reflection;

Namespace Remotingtest
{
Class Program
{
Static   Void Main ( String [] ARGs)
{
Appdomain ad = Appdomain. createdomain ( " Appdomain2 " );
Remotingobj Ro = Ad. createinstanceandunwrap (assembly. getexecutingassembly (). fullname, " Remotingtest. remotingobj " ) As Remotingobj; // Ro is a local transparent proxy pointing to objects in the newly created application domain
Console. writeline (Ro. indexof ( " Michael Jackson " , " Jack " )); // The remote object must have been created, but remotingobj. Flag is still 0. This indicates that the type object in the application domain is not set, and the typeof (remotingobj) in AD is set)
Bool Flag = System. runtime. remoting. remotingservices. istransparentproxy (RO );
Console. writeline (FLAG );
Remotingobj RO2 =   New Remotingobj (); // Objects in the application domain
Flag = System. runtime. remoting. remotingservices. istransparentproxy (RO2 );
Console. writeline (FLAG );
Int A = Ro. typehashcode ();
A = Ro2.typehashcode (); // Through F10, we can see that hashcode changes indicate that typeof (remotingobj) represents different objects in different AppDomains.
Console. Read ();
}
}

Public   Class Remotingobj: marshalbyrefobject
{
Public Remotingobj ()
{< br> remotingobj. flag = 112 ;
console. writeline ( string . format ( " remotingobj ({0 }) is created in {1} " , This . gethashcode (), appdomain. currentdomain. friendlyname);
}

Public   Int Indexof ( String Str1, String Str2)
{
ReturnStr1.indexof (str2 );
}

Public   Int Typehashcode ()
{
Return Typeof(Remotingobj). gethashcode ();
}

Public   Static   Int Flag;
}
}