[Mono-list] Instantiating an object via AppDomain.CreateInstance

[Lluis Sanchez]

Looks like a bug. Can you please file a bug report in
bugzilla.ximian.com?

Thanks!
Lluis.

On dj, 2004-06-17 at 17:55, Yuri Leikind wrote:
> Hello all,
> 
> 
> If I instantiate an object via AppDomain.CreateInstance , and this object's
> class has a constructor with parameters, I get the exception
> 
> 	Unhandled Exception: System.MissingMethodException: Constructor not found.
> 
> though needed parameters are passed to AppDomain.CreateInstance
> 
> I found it out trying an example from Programming C#, 2nd edition. This example
> runs on MS .NET and fails on Mono.
> 
> Here is it :
> 
> ====================================
> using System;
> using System.Runtime.Remoting;
> using System.Reflection;
> namespace ProgCSharp
> {
>    // for marshal by reference comment out
>    // the attribute and uncomment the base class
>    [Serializable]
>    public class Point // : MarshalByRefObject
>    {
>       public Point (int x, int y)
>       {
>          Console.WriteLine( "[{0}] {1}",
>             System.AppDomain.CurrentDomain.FriendlyName,
>             "Point constructor");
>          this.x = x;
>          this.y = y;
>       }
>       public int X
>       {
>          get
>          {
>             Console.WriteLine( "[{0}] {1}",
>                System.AppDomain.CurrentDomain.FriendlyName,
>                "Point x.get");
>             return this.x;
>          }
>          set
>          {
>             Console.WriteLine( "[{0}] {1}",
>                System.AppDomain.CurrentDomain.FriendlyName,
>                "Point x.set");
>             this.x = value;
>          }
>       }
>       public int Y
>       {
>          get
>          {
>             Console.WriteLine( "[{0}] {1}",
>                System.AppDomain.CurrentDomain.FriendlyName,
>                "Point y.get");
>             return this.y;
>          }
>          set
>          {
>             Console.WriteLine( "[{0}] {1}",
>                System.AppDomain.CurrentDomain.FriendlyName,
>                "Point y.set");
>             this.y = value;
>          }
>       }
> 
> 
>    private int x;
>    private int y;
> }
> // the shape class marshals by reference
> public class Shape : MarshalByRefObject
> {
>    public Shape(int upperLeftX, int upperLeftY)
>    {
>       Console.WriteLine( "[{0}] {1}",
>          System.AppDomain.CurrentDomain.FriendlyName,
>          "Shape constructor");
>       upperLeft = new Point(upperLeftX, upperLeftY);
>    }
>    public Point GetUpperLeft( )
>    {
>       return upperLeft;
>    }
>    public void ShowUpperLeft( )
>    {
>       Console.WriteLine( "[{0}] Upper left: {1},{2}",
>          System.AppDomain.CurrentDomain.FriendlyName,
>          upperLeft.X, upperLeft.Y);
>    }
>    private Point upperLeft;
> }
> public class Tester
> {
>    public static void Main( )
>    {
>       Console.WriteLine( "[{0}] {1}",
>          System.AppDomain.CurrentDomain.FriendlyName,
>          "Entered Main");
>       // create the new app domain
>       AppDomain ad2 =
>          AppDomain.CreateDomain("Shape Domain");
>       // Assembly a = Assembly.LoadFrom("ProgCSharp.exe");
>       // Object theShape = a.CreateInstance("Shape");
>       // instantiate a Shape object
>       ObjectHandle oh = ad2.CreateInstance(
>          "ProgCSharp",
>          "ProgCSharp.Shape", false,
>          System.Reflection.BindingFlags.CreateInstance,
>          null, new object[] {3, 5},
>          null, null, null );
>       Shape s1 = (Shape) oh.Unwrap( );
>       s1.ShowUpperLeft( );     // ask the object to display
>       // get a local copy? proxy?
>       Point localPoint = s1.GetUpperLeft( );
>         // assign new values
>         localPoint.X = 500;
>         localPoint.Y = 600;
>         // display the value of the local Point object
>         Console.WriteLine( "[{0}] localPoint: {1}, {2}",
>            System.AppDomain.CurrentDomain.FriendlyName,
>            localPoint.X, localPoint.Y);
>         s1.ShowUpperLeft( );     // show the value once more
>       }
>    }
> }
> 
> ====================================
> 
> Here is the output:
> 
> leikind@pc324:~$ mono ProgCSharp.exe 
> [ProgCSharp.exe] Entered Main
> 
> Unhandled Exception: System.MissingMethodException: Constructor not found.
> 
> Server stack trace: 
> in <0x0019a> System.Activator:CreateInstance (System.Type,System.Reflection.BindingFlags,System.Reflection.Binder,object[],System.Globalization.CultureInfo,object[])
> in <0x00074> System.Activator:CreateInstance (string,string,bool,System.Reflection.BindingFlags,System.Reflection.Binder,object[],System.Globalization.CultureInfo,object[],System.Security.Policy.Evidence)
> in <0x00055> System.AppDomain:CreateInstance (string,string,bool,System.Reflection.BindingFlags,System.Reflection.Binder,object[],System.Globalization.CultureInfo,object[],System.Security.Policy.Evidence)
> in (unmanaged) (wrapper managed-to-native) System.Runtime.Remoting.RemotingServices:InternalExecute (System.Reflection.MonoMethod,object,object[],object[]&)
> in <0x00004> (wrapper managed-to-native) System.Runtime.Remoting.RemotingServices:InternalExecute (System.Reflection.MonoMethod,object,object[],object[]&)
> in <0x00172> System.Runtime.Remoting.RemotingServices:InternalExecuteMessage (System.MarshalByRefObject,System.Runtime.Remoting.Messaging.IMethodCallMessage)
> 
> 
> Exception rethrown at [0]: 
> 
> in <0x00748> System.Runtime.Remoting.Proxies.RealProxy:PrivateInvoke (System.Runtime.Remoting.Proxies.RealProxy,System.Runtime.Remoting.Messaging.IMessage,System.Exception&,object[]&)
> 
> =======================================
> 
> Does anyone have a clue to this incompatibility?