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QueryTask question

ThaoNguyen

Is there a way I can pass in my own parameters to QueryTask?
I can have 2 or more QueryTask run asynchronously, and the completed event handler are invoked after each QueryTask is done. I want to pass in a parameter to recognize which QueryTask I'm running. Or is there a flag or property that I can detect?

Thanks!

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DominiqueBroux

Is there a way I can pass in my own parameters to QueryTask?
I can have 2 or more QueryTask run asynchronously, and the completed event handler are invoked after each QueryTask is done. I want to pass in a parameter to recognize which QueryTask I'm running. Or is there a flag or property that I can detect?

Thanks!

As Dave mentionned, you can set a userToken when you invoke ExecuteAsync.
Then when the query has completed, we'll get this userToken as 'UserState' property of the returned QueryEventArgs.

GeorgePan

Yes, you will have access to UserToken in the Completed event. See post# 4 in this thread http://forums.arcgis.com/threads/19810-showing-related-records-in-maptips

Do you have any issues to use QueryTask.Token = "Token", I got a token with 120 minutes life time from the secured ArcGIS Server 10 web service, and it works well using http://......./?query/token=taokenstring on IE, but run it from Silverlight C# code, it always shows me the error: SystemSecurityException. Is that an ESRI issue / bug?

Thanks,

George

ThaoNguyen

Yes, this is possible with UserToken

IDictionary<string, object> parameters = new Dictionary<string, object>();
parameters["param1"] = 1;
parameters["param2"] = "one";
QueryTask qt = new QueryTask();
Query q = new Query();
qt.ExecuteCompleted += (s, e) =>
{
 var myParams = e.UserState as IDictionary;
 var param1 = (int)myParams["param1"];
 var param2 = (string)myParams["param2"];
};
qt.ExecuteAsync(q, parameters);

That's great!!! It is what I'm looking for. Thanks!

JenniferNery

Yes, this is possible with UserToken

IDictionary<string, object> parameters = new Dictionary<string, object>();
parameters["param1"] = 1;
parameters["param2"] = "one";
QueryTask qt = new QueryTask();
Query q = new Query();
qt.ExecuteCompleted += (s, e) =>
{
 var myParams = e.UserState as IDictionary;
 var param1 = (int)myParams["param1"];
 var param2 = (string)myParams["param2"];
};
qt.ExecuteAsync(q, parameters);

ThaoNguyen

Yes, you will have access to UserToken in the Completed event. See post# 4 in this thread http://forums.arcgis.com/threads/19810-showing-related-records-in-maptips

I'm using QueryTask. I've been adding new attributes to graphic and have no problem with that. My question is different. For each QueryTask, before it is executed, I want to set some values to QueryTask so that I can retrieve when the task is completed. Just imagine QueryTask as a car. Before it runs, I put some cargos in that car, when it reaches my destination, I want to get my cargos back.
It's like writing a jsp page, you can pass in parameters in url such as: http://www.mypage.com?myParam1=test1&myParam2=test2.
myParamx are what I mean, I want to pass along the parameters for my use later for each QueryTask.
Anyway, I think QueryTask.Token works for me at this point. Not really sure if it is safe to use for my case

. I hope it is OK. I don't see any reason for "unsafe".

Thanks!

JenniferNery

Yes, you will have access to UserToken in the Completed event. See post# 4 in this thread http://forums.arcgis.com/threads/19810-showing-related-records-in-maptips

ThaoNguyen

You can pass in a value for the userToken when you invoke ExecuteAsync. See the reference for details http://help.arcgis.com/en/webapi/silverlight/apiref/ESRI.ArcGIS.Client~ESRI.ArcGIS.Client.Tasks.QueryTask~ExecuteAsync(Query,Object).html

Actually, I want to retrieve the value when the completed event handler is called so that I can use this value for something else. I found QueryTask.Token helps me achieve this goal.
Can I retrieve userToken in completed event handler?

DaveTimmins

You can pass in a value for the userToken when you invoke ExecuteAsync. See the reference for details http://help.arcgis.com/en/webapi/silverlight/apiref/ESRI.ArcGIS.Client~ESRI.ArcGIS.Client.Tasks.QueryTask~ExecuteAsync(Query,Object).html

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