C# Discussion Boards - CodeProject

Remoting & Events ("Exception has been thrown by the target of an invocation.”)

bluescreen7611-Mar-10 8:41

11-Mar-10 8:41

Hi,
I have been struggling with receiving events from a server to a client (using .NET remoting) for quite a long time now but I keep receiving the following message on client side (“Exception has been thrown by the target of an invocation.”). This message is received as the server is trying to call the event handler while the event handler exists in the client and since the client assembly is not available on the side of the server, this message comes.
Any idea?

Server Class library
-----------------------------

public delegate void MyDel();
 
    public class ServerClass : MarshalByRefObject
    {
        public event MyDel myEvent;
 
        public void StartServer (bool shouldFireEvent)
        {
            TcpServerChannel tsc;
            BinaryServerFormatterSinkProvider provider = new BinaryServerFormatterSinkProvider();
            provider.TypeFilterLevel = TypeFilterLevel.Full;
            IDictionary di = new Hashtable();
            di["port"] = 8085;
            di["bindTo"] = "172.19.35.191";
            tsc = new TcpServerChannel(di, provider);
            ChannelServices.RegisterChannel(tsc, false);
            RemotingConfiguration.RegisterWellKnownServiceType(typeof(ServerClass), "myURI", WellKnownObjectMode.Singleton);
 
            if (shouldFireEvent)
            {
                while (true)
                {
                    myEvent();
                    Thread.Sleep(1000);
                }
            }
        }
    }

Server GUI
-----------------------------

class ServerGui
    {
        static void Main(string[] args)
        {
            ServerClass server = new ServerClass();
            server.myEvent += new MyDel(ReceivedEventFromServerHandler); //lets register to event
            server.StartServer(true);
            Console.WriteLine("server is running. press enter to quit");
            Console.ReadKey();
        }

        static void ReceivedEventFromServerHandler()
        {
            Console.WriteLine("I am the server GUI. Got a message from the server");
        }
    }

Client
--------------

class ClientClass
    {
        static void Main(string[] args)
        {
            ServerClass server = (ServerClass)Activator.GetObject(typeof(ServerClass), "tcp://172.19.35.191:8085/myURI");
            server.myEvent += new MyDel(server_myEvent); //HERE IT CRASHES
            while (true)
            {
                Thread.Sleep(1000);
            }
        }
 
        static void server_myEvent()
        {
            Console.WriteLine("I am the client. Got a message from the server over the network");
        }
    }

Remoting & Events ("Exception has been thrown by the target of an invocation.”) - urgent!

bluescreen7616-Mar-10 4:18

bluescreen76

16-Mar-10 4:18

Guys, anyone? please please please, it's becoming urgent for me. I don't have a solution even after looking in the web for a week now...

Outlook addin integration problem with Outlook 2007

mosh_3311-Mar-10 6:52

mosh_33

11-Mar-10 6:52

Hi,

This is my second post, I hope to do better that the first one..

I wrote a small addin in C# to Outlook 2007.
It connects to a local DB and should remove mail addresses which are either "Bounced" (not vaild) or asked to un-subscribe from the mailing list.

The addin was written using Visual Studio 2008 VSTO tools.
It does what it should, when I debug, yet when I step out of my managed code, the Outlook hangs, CPU is 100% and the message I see at the system tray is "Outlook is synchronizing folders".

When I remove my logic and use a "hard coded" address - it works.

I would also like to attach my code, since it's very long, I will only put some part of it here,
I can send the complete file (300 lines totally) by mail.

I will appreciate if someone is familiar with this Smile | :)

TIA,
Amit.

<code>
void App_ItemSend(object Item, ref bool Cancel)
{
Outlook.MailItem Mail = (Outlook.MailItem)Item;

//Get the addresses from the "To" field
string[] toArray =
Mail.To == null ? new string[] { } : Mail.To.Split(new char[] { ';', ',' }, StringSplitOptions.RemoveEmptyEntries);

//Internal Data Structures to hold the "To"recipients
Dictionary<string, Recipient> toDic = new Dictionary<string, Recipient>();

List<string> emailToCheck = new List<string>();
List<string> invalidEmails = null;

//Remove spaces from the "To" list (originally recieved as "tuktuk@blabla.com; oved@sabih.com")
for (int i = 0; i < toArray.Length; i++)
{
toArray[i] = toArray[i].Replace(" ", "");
}

try
{
while (Mail.Recipients.Count > 0)
{
//Get the first recipient object in the recipient list
Recipient rec = Mail.Recipients[1];
//Remove the first object from the recipient list
Mail.Recipients.Remove(1);

List<Recipient> recList = new List<Recipient>();
ICollection<string> emailList = GetEmailsList(rec.AddressEntry);

foreach (string email in emailList)
{
//Create a new recipient
Recipient newRec = Mail.Session.CreateRecipient(email);
if (!newRec.Resolve())
{
//if eMail address can't be verified against the Outlook address book - skip it
continue;
}

//if eMail address is valid against the address book, add it to the current recipient list
recList.Add(newRec);

//Add the new recipient to the list of emails to check "Bounced"/"Un-Subscribed"
if (!emailToCheck.Contains(newRec.Address))
{
emailToCheck.Add(newRec.Address);
}
}

//If the current recipient is contained in the original "To" list, then go over the recipient list
//For each such recipient under that recipient name, add it the the "To" group
if (Array.IndexOf(toArray, rec.Name) >= 0)
{
foreach (Recipient r in recList)
{
toDic[r.Address.ToLower()] = r;
}
}

}

// Get the list of invalid email lists
invalidEmails = GetInvalidEmails(emailToCheck);
}
catch (System.Exception e)
{
Cancel = true;
MessageBox.Show(e.Message + "\nMailing Canceled", "Error Validating Emails");
return;
}

//Create the final data structure for the email lists
StringBuilder toList = new StringBuilder();

//Go over each entry in the "To" dictionary. In case the current entry is valid, add it to the "To" final list
foreach (KeyValuePair<string, Recipient> kvp in toDic)
{
if (invalidEmails == null || !invalidEmails.Contains(kvp.Key.Replace("'", "")))
{
toList.AppendFormat("{0};", kvp.Key);
}
}

if (toList.Length == 0 && ccList.Length == 0 && bccList.Length == 0)
{
MessageBox.Show("All recipients addresses are invalid or unsubscribed.\nSend operation aborted.");
Cancel = true;
return;
}

Mail.To = null;

//Add the address lists back to the original "To" list of the Outlook 2007 object
if (toList.Length > 0)
{
Mail.To = toList.ToString().Substring(0, toList.Length - 1);
}
}

</code>

Switch versus an array of delegates

PIEBALDconsult11-Mar-10 5:36

PIEBALDconsult

11-Mar-10 5:36

Perhaps it's been mentioned before, but I'm looking at a switch (with sixteen cases, a little bit large) and it has occurred to me that because it's controlled by an enumerated value (zero to fifteen) that I might get better performance (or maybe worse), and perhaps better readability from an array of delegates (perhaps anonymous methods).

The value has already been validated so I know that it won't be out of range. I would also know that none of the values is null.

Maintainability might be hindered somewhat, depending on how I implement it.

Any experiences? Discuss...