So this code runs in an asp.net app on Linux. The code calls one of my services. (WCF doesn't work on mono currently, that is why I'm using asmx). This code works AS INTENDED when running from Windows (while debugging). As soon as I deploy to Linux, it stops working. I'm definitely baffled. I've tested the service thoroughly and the service is fine.
Here is the code producing an error: (NewVisitor is a void function taking 3 strings in)
//This does not work.
try
{
var client = new Service1SoapClient();
var results = client.NewVisitor(Request.UserHostAddress, Request.UrlReferrer == null ? String.Empty : Request.UrlReferrer.ToString(), Request.UserAgent);
Logger.Debug("Result of client: " + results);
}
Here is the error generated: Object reference not set to an instance of an object
Here is the code that works perfectly:
//This works (from the service)
[WebMethod(CacheDuration = _cacheTime, Description = "Returns a List of Dates", MessageName = "GetDates")]
public List<MySqlDateTime> GetDates()
{
return db.GetDates();
}
//Here is the code for the method above
var client = new Service1Soap12Client();
var dbDates = client.GetDates();
I'd love to figure out why it is saying that the object is not set.
Methods tried:
new soap client.
new soap client with binding and endpoint address specified
Used channel factory to create and open the channel.
If more info is needed I can give more. I'm out of ideas.
It looks like a bug in mono. You should file a bug with a reproducible test case so it can be fixed (and possibly find a workaround you can use).
Unfortunately, I don't have Linux to test it but I'd suggest you put the client variable in an using() statement:
using(var client = new Service1SoapClient())
{
var results = client.NewVisitor(Request.UserHostAddress, Request.UrlReferrer == null ?
String.Empty : Request.UrlReferrer.ToString(), Request.UserAgent);
Logger.Debug("Result of client: " + results);
}
I hope it helps.
RC.
Related
Currently, I have dozens of .NET services hosted on various machines that show up as Resources on my AppInsights Application Map, which also shows their dependencies with respect to each other, based on the HTTP requests they make.
However, the relationships between services that communicate through NServiceBus (RabbitMQ) are not shown. Now, I am able to show the messages that are either sent or handled by a service via calls to TelemetryClient.TrackXXX(), but not connect Resources on the map using this information.
I have even gone so far as to attach the parent operation ID from the NSB message sender to the message itself, and assign it to the telemetry object in the receiver, but there is still no line drawn between the services in the Application Map.
To reiterate, this is what I'm getting in the Application Map:
(NSB Message Sender) --> (Message sent/handled)
And this is what I want:
(NSB Sender) --> (Receiver)
The services in question are .NET Core 3.1.
I cannot provide the code, as this is for my work, but any help would be greatly appreciated. I've searched everywhere, and even sources that seemed like they would help, didn't.
(not signed in, posting from work)
Alright, I finally got it. My approach to correlate AppInsights resources using their NSB communication is to mimic HTTP telemetry correlation.
Below is an extension method I wrote for AppInsights' TelemetryClient. I made a subclass named RbmqMessage:NServiceBus.IMessage, given my applications use RBMQ, and gave it the following properties for the sake of correlation (all set in the service that sends the message) :
parentId: equal to DependencyTelemetry.Id
opId: value is the same in the sender's DependencyTelemetry and the receiver's RequestTelemetry. Equal to telemetry.context.operation.id
startTime: DateTime.Now was good enough for my purposes
The code in the service that sends the NSB message:
public static RbmqMessage TrackRbmq(this TelemetryClient client, RbmqMessage message)
{
var msg = message;
// I ran into some issues with Reflection
var classNameIdx = message.ToString().LastIndexOf('.') + 1;
var messageClassName = message.ToString().Substring(classNameIdx);
var telemetry = new DependencyTelemetry
{
Type = "RabbitMQ",
Data = "SEND "+messageClassName,
Name = "SEND "+messageClassName,
Timestamp = DateTime.Now,
Target = "RECEIVE "+messageClassName //matches name in the service receiving this message
};
client.TrackDependency(telemetry);
msg.parentId = telemetry.Id;
msg.opId = telemetry.Context.Operation.Id; //this wont have a value until TrackDependency is called
msg.startTime = telemetry.Timestamp;
return msg;
}
The code where you send the NSB message:
var msg = new MyMessage(); //make your existing messages inherit RbmqMessage
var correlatedMessage = _telemetryClient.TrackRbmq(msg);
MessageSession.Publish(correlatedMessage); //or however the NSB message goes out in your application
The extension method in the NServiceBus message-receiving service:
public static void TrackRbmq(this TelemetryClient client, RbmqMessage message)
{
var classnameIdx = message.ToString().LastIndexOf('.')+1;
var telemetry = new RequestTelemetry
{
Timestamp = DateTime.Now,
Name = "RECEIVE "+message.ToString().Substring(classNameIdx)
};
telemetry.Context.Operation.ParentId = message.parentId;
telemetry.Context.Operation.Id = message.opId;
telemetry.Duration = message.startTime - telemetry.Timestamp;
client.TrackRequest(telemetry);
}
And finally, just track and send the message:
var msg = new MyMessage();
_telemetryClient.TrackRbmq(msg);
MessagePipeline.Send(msg); //or however its sent in your app
I hope this saves someone the trouble I went through.
I have been working on a WCF web service, which is used by a mobile app that would send some data to it and save to DB.
One of the test case is that we try to append 2 (or more) records in the app, and the service is called to do a batch insert / update action.
Everything goes fine when I test using localhost, but when we test it using production server, only
the first record is saved, while the other record triggers the error message
Unable to determine a valid ordering for dependent operations...store-generated values.
I have no idea what is the cause and how to solve it. I have done some research and I am quite sure that the related model/DB table has NO circular dependency or self dependency.
Below is a snippet of the web service:
public void submit(List<SubmissionParameter> param){
using (var context = ObjectContextManager.AuditEnabledInstance){
foreach (var item in param){
ReadingSubmission readingSubmission = context.ReadingSubmissions.Where(p => p.ReadingSubmissionUniqueIdentifier == item.Readingsubmissionuniqueidentifier).SingleOrDefault();
if (readingSubmission == null){
readingSubmission = new ReadingSubmission();
context.ReadingSubmissions.AddObject(readingSubmission);
}
readingSubmission.ReadingSubmissionUniqueIdentifier = item.Readingsubmissionuniqueidentifier;
readingSubmission.SystemID = item.Systemid;
readingSubmission.UserID = item.Userid;
foreach (var record in item.Readings){
SystemReading systemReading = context.SystemReadings.Where(p => p.SystemReadingUniqueIdentifier == record.Systemreadinguniqueidentifier).SingleOrDefault();
if (systemReading == null){
systemReading = new SystemReading();
readingSubmission.SystemReadings.Add(systemReading);
}
systemReading.SystemReadingUniqueIdentifier = record.Systemreadinguniqueidentifier;
systemReading.MeasurementID = record.Measurementid;
}
context.SaveChanges();
}
}
}
ReadingSubmission and SystemReading is a 1 to many relation
SubmissionParameter is just a transmission object as the mobile client will send the JSON object to this web service.
I use Telerik Fiddler to post the JSON into this web service for testing, so I am quite sure the problem is not at the mobile client side.
Any help is appreciated! Thanks!
Finally I solve the problem though I am not quite sure why it works.
I move the context.SaveChanges() out of the foreach loop then it all works again for
both localhost and production
Hope it can help someone to save some time
I am using ASP.Net 3.5 with C#,Development ID:Visual Studio 2008. When I am using
Session["FileName1"] = "text1.txt"
it is working fine, but then I am using
number1=17;
string FileName1="FileName1" + number1.toString();
then setting with
Session[FileName1]="text1.txt";
gives me runtime error
The session state information is invalid and might be corrupted
at System.Web.SessionState.SessionStateItemCollection.Deserializer(BinaryReader reader)
Can anybody solve my problem, when I am using string in the Session variable? Remember it works on my development machine (meaning local Visual Studio) but when deployed to the server it gives mentioned error.
Make sure the FileName1 variable is not null before trying to access it via the Session[FileName1] syntax...
Here's a link to someone else that was having the same problem:
http://forums.asp.net/t/1069600.aspx
Here's his answer:
In the code, I found the following line:
//some code
Session.Add(sessionVarName, sessionVarValue);
//some other code
Apparently, because of some dirty data, there is a time when
sessionVarName is null.
Session.Add will not throw any exception in this case, and if your
Session Mode is "InProc", there will be no problem. However, if your
Session Mode is "SQLServer", during deserialization of the session
store, you will got the exception that I got. So, to filter out dirty
data, I modified the code to become:
if (sessionVarName != null)
{
//somecode
Session.Add(sessionVarName, sessionVarValue);
//some other code
}
the reason of your error is
xyz = new Guid() is also xyz= Guid.Empty;
so when you try to convert to string it's throw error.
just modify you code something like that.
Guid guId = System.Guid.NewGuid();
string x = guId .ToString();
string FileName1="text1.txt" + x;
Session[FileName1]="text1.txt";
Check your values before storing them in session they may cause this exception during deserialization of the session store, Filter your data .
Check Here
if(!string.IsNullOrEmpty(FileName1))
{
Session.Add(FileName1, "text1.txt");
}
Or check for Invalid characters in your string .
You can add the Value into session Like this
string FileName1="FileName1" + number1.toString();
if(!string.IsNullOrEmpty(FileName1))
{
Session.Add(FileName1, "text1.txt");
}
Well i'm using Microsoft Speech Platform SDK 10.2.
I made a asp.Net WebService application and most of the WebServices works fine (HelloWorld(), etc...), but I have one service that uses the SpeechRecognitionEngine and when I deploy the application and try to run this webservice I get no result, i.e, I can see through the debug mode that it reaches the return line, but when I call it trought the browser the page keeps loading for ever, without any response.
Here's a sample of the code:
[WebMethod]
public bool voiceRecognition() {
SpeechRecognitionEngine sre = new SpeechRecognitionEngine(new System.Globalization.CultureInfo("pt-PT"));
Choices c = new Choices();
c.Add("test");
GrammarBuilder gb = new GrammarBuilder();
gb.Append(c);
Grammar g = new Grammar(gb);
sre.LoadGrammar(g);
sre.InitialSilenceTimeout = TimeSpan.FromSeconds(5);
//// just for Testing
RecognitionResult result = null;
if (result != null) {
return true;
} else {
return false;
}
}
Note: I'm using IIS to deploy the WebService Application.
If someone have some thoughts please let me know.
I don't know if you've found your answer or not. When trying to solve this myself a couple of days ago, I stumbled across your question and it matched our circumstances to a "T".
In order to fix it all we had to do was put...
sre.RecognizeAsyncStop();
sre.Dispose();
where "sre" is your SpeechRecognitionEngine variable. If you don't stop it and dispose of it at the end of your web service then the web service won't return.
Hope this helps. :)
I'm using Adobe Stratus (now renamed to Cirrus) to build a p2p application. Inside the application, I used NetStream.onPeerConnect callback function and expected it to be triggered every time when a peer is connected. However, it always failed with my friend A while strangely friend B managed to have the function called without any problem.
I was wondering what could be the cause to this issue?
Here are how the code pieces look like.
First of all, create a NetConnection.
netConnection = new NetConnection();
netConnection.addEventListener(NetStatusEvent.NET_STATUS, netConnectionHandler);
netConnection.connect(SERVER_ADDRESS+DEVELOPER_KEY);
Secondly, create NetStream upon NetConnection successfully connected.
private function netConnectionHandler(event:NetStatusEvent):void{
switch (event.info.code){
case "NetConnection.Connect.Success":
sendStream = new NetStream(netConnection, NetStream.DIRECT_CONNECTIONS);
sendStream.addEventListener(NetStatusEvent.NET_STATUS, netStreamHandler);
var sendObj:Object = new Object();
sendObj.onPeerConnect = function(subscriber:NetStream) : Boolean {
trace("[onPeerConnect] far id: " + subscriber.farID);
return true;
}
sendStream.client = sendObj;
sendStream.publish("file");
......
Thirdly, here's how I build the connection between two peers
receivedStream = new NetStream(netConnection, farId);
receivedStream.client = this;
receivedStream.addEventListener(NetStatusEvent.NET_STATUS, incomingStreamHandler);
receivedStream.play("file");
Please help enlighten me. Thanks!
It turns out my friend A is behind a symmetric NAT. I'm thinking to setup a TURN server for us to build a successful connection.