Web Forms :: The Client Disconnected?
Jun 27, 2010The client disconnected.File Name: {0}Method Name: {0} Application_Error Error Line Number: {0} Error Column Number: {0}
[code]...
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---------------------------------------------
Message: The client disconnected.
Source: System.Web
Method: Void ThrowError(System.Exception, System.String, System.String, Boolean)
Stack Trace:at System.Web.UI.ViewStateException.ThrowError(Exception inner, String persistedState, String errorPageMessage, Boolean macValidationError)
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Oct 26, 2010First, let me explain a little bit about my setup. My server is setup as a Marshaled singleton object:
RemotingServices.Marshal(lsServer, ServerObject.objectUri);
In order to have two-way communication from the server to the client, the client activates a ServerObject, then passes in its own ClientObject (which is also a MarshalByRefObject) the server uses the ClientObject to talk back to the client:
var lsClient = new ClientObject();
var lsServer = (ServerObject)Activator.GetObject(typeof(ServerObject), url);
lsServer.attach(lsClient);
When the attach method is called, the server takes the ClientObject and stores it in a List:
public void attach(ClientObject client) {
clientList.Add(client);
}
The server can then call a method on the ClientObject called "SendMessage" to communicate to each client in its list:
foreach(var c in clientList) {
c.SendMessage("Hello");
}
This works great until a client is encountered that has disconnected. In this case, an error is thrown about the client refusing the connection. I can catch the error, but the problem is I cannot remove the reference to the ClientObject from the server's List. The following re-throws the "connection refused" exception anytime a client has been disconnected:
clientList.Remove(badClient);
So a couple of questions:
1- Is there a way to detect the connection state of a client without having to catch an error?
2- When I do detect a client that has disconnected, why does the attempt to remove the object from the server's list appear to "communicate" with the client (thus causing the exception to be thrown again?)
EDIT
As Patrick pointed out below, doing a Remove from a list causes the List to iterate my objects and do a comparison on them (calling .Equals) - this is what caused my ClientObject to attempt to communicate again and thus throw the exception. To resolve it, I instead changed the List to a dictionary keyed off a unique ID supplied by my Client at the time of attaching to the server. Then I used that unique ID to remove the client. I never did find a direct way for determining if a client had disconnected other than catching the error.
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Incident (table):
-ID
-other fields
Responses (table):
-FK:Incident.ID
-other fields
And and entities that match:
Incident (entity)
-ID
-Other fields
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Each Incident can have 0 or more responses.
In my Webpage, I have a form to allow the user to enter all the details of an Incident, including a list of responses. I can add everything to the database when a new Incident is created, however I'm having difficulty with editing the Incident.
When the page loads for edit, I populate the form and then store the responses in the viewstate. When the user changes the list of responses (adds one, deletes one or edits one). I store this back into the viewstate. Then when the user clicks the save button, I'd like to save the changes to the Incident and the Responses back to the DB. I cannot figure out how to get the responses from the detached viewstate into the Incident object so that they can be updated together.
Currently when the user clicks save, I'm getting the Incident to edit from the db, making changes to the Incident's fields and then saving it back to the DB. However I can't figure out how to have the detached list of responses from the viewstate attach to the Incident. I have tried the following without success:
Clearning the Incident.Responses collection and adding the ones from the viewstate back in:
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for each objResponse in Viewstate("Responses")
Incident.Responses.add(objResponse)
next
Creating an EntityCollection from my list and then assiging that to the Incident.Responses
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Next
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Jun 13, 2010using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
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{
protected void Page_Load(object sender, EventArgs e)
{
var a = Request; //I didn't find the data in Request's structure.
Response.Write("successed; hello World;");
}
}
//-----------------------javascript--------------
for( var i=0; i<this.dataToBeSent.length && this.dataToBeSent[i].hasSent == false; i++ )
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}
};
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