Hi Juan,

When dealing with VS2005 automation, one most possible cause of the
exception RPC_E_CALL_REJECTED you're seeing is because the IDE itself is
not ready to accept a request to call into the automation model. If your
client here implements IMessageFilter, you will see RejectType ==
SERVERCALL_RETRYLATER (2).

Therefore, the fix here is to implement IMessageFilter and handle
SERVERCALL_RETRYLATER to retry again in a short time:

   // Definition of the IMessageFilter interface which we need to
implement and
   // register with the CoRegisterMessageFilter API.
   [ComImport(), Guid("00000016-0000-0000-C000-000000000046"),
   InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)]
   interface IOleMessageFilter // Renamed to avoid confusion w/
System.Windows.Forms.IMessageFilter
   {
       [PreserveSig]
       int HandleInComingCall(int dwCallType, IntPtr hTaskCaller, int
dwTickCount, IntPtr lpInterfaceInfo);
       [PreserveSig]
       int RetryRejectedCall(IntPtr hTaskCallee, int dwTickCount, int
dwRejectType);
       [PreserveSig]
       int MessagePending(IntPtr hTaskCallee, int dwTickCount, int
dwPendingType);
   }

   class Program : IOleMessageFilter
   {
       [DllImport("ole32.dll")]
       private static extern int CoRegisterMessageFilter(IOleMessageFilter
newFilter, out IOleMessageFilter oldFilter);

       [STAThread]
       static void Main(string[] args)
       {
           Program program = new Program();

           program.Register();

......

           program.Revoke();

           // to ensure the dte object is actually released, and the
devenv.exe process terminates.
           GC.Collect();

           GC.WaitForPendingFinalizers();
       }

       void Register()
       {
           IOleMessageFilter oldFilter;
           CoRegisterMessageFilter(this, out oldFilter);
       }

       void Revoke()
       {
           IOleMessageFilter oldFilter;
           CoRegisterMessageFilter(null, out oldFilter);
       }

       #region IOleMessageFilter Members

       public int HandleInComingCall(int dwCallType, IntPtr hTaskCaller,
int dwTickCount, IntPtr lpInterfaceInfo)
       {
           return 0; //SERVERCALL_ISHANDLED
       }

       public int RetryRejectedCall(IntPtr hTaskCallee, int dwTickCount,
int dwRejectType)
       {
           if (dwRejectType == 2) // SERVERCALL_RETRYLATER
               return 200; // wait 2 seconds and try again
           return -1; // cancel call
       }
       public int MessagePending(IntPtr hTaskCallee, int dwTickCount, int
dwPendingType)
       {
           return 2; //PENDINGMSG_WAITDEFPROCESS
       }
       #endregion
   }

For a complete example on this technique, please refer to following article:

#Chetan Chudasama's Weblog : Code to install Community Toolbox Controls
http://blogs.msdn.com/chetanc/archive/2006/01/19/515016.aspx

Hope this helps.

Sincerely,
Walter Wang (wawang@online.microsoft.com, remove 'online.')
Microsoft Online Community Support

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