Async web service methods calls

[=?Utf-8?B?U3RlZmFuIEZpbGlw?=]

Hello,

I'm trying to launch several async calls for different methods of a web
service, but I get this error when i'm trying to read the result (There was
an error during asynchronous processing. Unique state object is required for
multiple asynchronous simultaneous operations to be outstanding.). I read the
post at
http://forums.microsoft.com/MSDN/Sho...79895&SiteID=1, and I
get the same error, but I have async calls to different web service methods.
What should I do?
Thanks

[John Saunders [MVP]]

"Stefan Filip" <St*********@di scussions.micro soft.comwrote in message
news:E2******** *************** ***********@mic rosoft.com...

Hello,

I'm trying to launch several async calls for different methods of a web
service, but I get this error when i'm trying to read the result (There
was
an error during asynchronous processing. Unique state object is required
for
multiple asynchronous simultaneous operations to be outstanding.). I read
the
post at
http://forums.microsoft.com/MSDN/Sho...79895&SiteID=1,
and I
get the same error, but I have async calls to different web service
methods.
What should I do?

You should use a unique state object. It's not a per-method. Thing.

--
--------------------------------------------------------------------------------
John Saunders | MVP - Windows Server System - Connected System Developer

[=?Utf-8?B?U3RlZmFuIEZpbGlw?=]

Thanks for answering John, but I already did that. Here's how my code looks
like:

languageReady = false;
contestReady = false;
usercontrolsRea dy = false;

backendService. GetControlsCons tantsCompleted += new
GetControlsCons tantsCompletedE ventHandler(bac kendService_Get ControlsConstan tsCompleted);
backendService. GetControlsCons tantsAsync(1);
backendService. GetContestIdByC odeCompleted += new
GetContestIdByC odeCompletedEve ntHandler(backe ndService_GetCo ntestIdByCodeCo mpleted);

backendService. GetContestIdByC odeAsync((strin g)Request.Query String["contest"], 1);
backendService. GetLanguageIdBy CodeCompleted += new
GetLanguageIdBy CodeCompletedEv entHandler(back endService_GetL anguageIdByCode Completed);

backendService. GetLanguageIdBy CodeAsync((stri ng)Request.Quer yString["language"], 1);

((string)Reques t.QueryString["language"]);

while (!(languageRead y && contestReady
&&usercontrolsR eady))
{ }
Session["BackendContest Data"] =
backendService. GetPublicContes tData((int)Sess ion["ContestId"]);
backendContestD ata =
(PublicContestD ata)(Session["BackendContest Data"]);

So I have 3 web services methods which are called async, and I want to wait
until I get the response from all the 3 of them (I set the bool values to
true in the event handler for the completion of the web service methods). As
you can see all 3 methods are called with the same unique user state (1) and
if I do this I get the error inside the event handlers. If I set each method
a different unique user state (1, 2, 3 for example) then my events are not
fired.

[John Saunders [MVP]]

"Stefan Filip" <St*********@di scussions.micro soft.comwrote in message
news:6C******** *************** ***********@mic rosoft.com...

Thanks for answering John, but I already did that. Here's how my code
looks
like:

languageReady = false;
contestReady = false;
usercontrolsRea dy = false;

backendService. GetControlsCons tantsCompleted += new
GetControlsCons tantsCompletedE ventHandler(bac kendService_Get ControlsConstan tsCompleted);
backendService. GetControlsCons tantsAsync(1);
backendService. GetContestIdByC odeCompleted += new
GetContestIdByC odeCompletedEve ntHandler(backe ndService_GetCo ntestIdByCodeCo mpleted);

backendService. GetContestIdByC odeAsync((strin g)Request.Query String["contest"],
1);
backendService. GetLanguageIdBy CodeCompleted += new
GetLanguageIdBy CodeCompletedEv entHandler(back endService_GetL anguageIdByCode Completed);

backendService. GetLanguageIdBy CodeAsync((stri ng)Request.Quer yString["language"],
1);

((string)Reques t.QueryString["language"]);

while (!(languageRead y && contestReady
&&usercontrolsR eady))
{ }
Session["BackendContest Data"] =
backendService. GetPublicContes tData((int)Sess ion["ContestId"]);
backendContestD ata =
(PublicContestD ata)(Session["BackendContest Data"]);

So I have 3 web services methods which are called async, and I want to
wait
until I get the response from all the 3 of them (I set the bool values to
true in the event handler for the completion of the web service methods).
As
you can see all 3 methods are called with the same unique user state (1)
and
if I do this I get the error inside the event handlers. If I set each
method
a different unique user state (1, 2, 3 for example) then my events are not
fired.

Sorry for not following up sooner, but aren't you the poster who got an
error complaining that you can't use the same state in multiple calls? Yet
here, you're telling me that you use the same state, and you get an error.
What did I miss?

What happens if you try something like:

object state1 = 1;
object state2 = 1;
object state3 = 1;

and pass state1, etc. as the state?

Perhaps you're not really passing the number 1? Are you passing some other
value type?
--
--------------------------------------------------------------------------------
John Saunders | MVP - Windows Server System - Connected System Developer

[=?Utf-8?B?U3RlZmFuIEZpbGlw?=]

Hi,

I finally realised what was going on. The problem was that the events were
not invoked because I was in an infinite loop (the while) and I didn't
realise that I was on the same thread, so the events could not be invoked.
Thanks anyway for your replies and sorry for loosing your time with this :).

"John Saunders [MVP]" wrote:

"Stefan Filip" <St*********@di scussions.micro soft.comwrote in message
news:6C******** *************** ***********@mic rosoft.com...

Thanks for answering John, but I already did that. Here's how my code
looks
like:

languageReady = false;
contestReady = false;
usercontrolsRea dy = false;

backendService. GetControlsCons tantsCompleted += new
GetControlsCons tantsCompletedE ventHandler(bac kendService_Get ControlsConstan tsCompleted);
backendService. GetControlsCons tantsAsync(1);
backendService. GetContestIdByC odeCompleted += new
GetContestIdByC odeCompletedEve ntHandler(backe ndService_GetCo ntestIdByCodeCo mpleted);

backendService. GetContestIdByC odeAsync((strin g)Request.Query String["contest"],
1);
backendService. GetLanguageIdBy CodeCompleted += new
GetLanguageIdBy CodeCompletedEv entHandler(back endService_GetL anguageIdByCode Completed);

backendService. GetLanguageIdBy CodeAsync((stri ng)Request.Quer yString["language"],
1);

((string)Reques t.QueryString["language"]);

while (!(languageRead y && contestReady
&&usercontrolsR eady))
{ }
Session["BackendContest Data"] =
backendService. GetPublicContes tData((int)Sess ion["ContestId"]);
backendContestD ata =
(PublicContestD ata)(Session["BackendContest Data"]);

So I have 3 web services methods which are called async, and I want to
wait
until I get the response from all the 3 of them (I set the bool values to
true in the event handler for the completion of the web service methods).
As
you can see all 3 methods are called with the same unique user state (1)
and
if I do this I get the error inside the event handlers. If I set each
method
a different unique user state (1, 2, 3 for example) then my events are not
fired.

Sorry for not following up sooner, but aren't you the poster who got an
error complaining that you can't use the same state in multiple calls? Yet
here, you're telling me that you use the same state, and you get an error.
What did I miss?

What happens if you try something like:

object state1 = 1;
object state2 = 1;
object state3 = 1;

and pass state1, etc. as the state?

Perhaps you're not really passing the number 1? Are you passing some other
value type?
--
--------------------------------------------------------------------------------
John Saunders | MVP - Windows Server System - Connected System Developer

[Rolf]

Hello,

I'm trying to launch several async calls for different methods of a web
service, but I get this error when i'm trying to read the result (There was
an error during asynchronous processing. Unique state object is required for
multiple asynchronous simultaneous operations to be outstanding.). I read the
post at
http://forums.microsoft.com/MSDN/Sho...79895&SiteID=1, and I
get the same error, but I have async calls to different web service methods.
What should I do?
Thanks

class Program
{
static void Main(string[] args)
{
s.UseDefaultCre dentials = true;
s.UnsafeAuthent icatedConnectio nSharing = true;

ParameterizedTh readStart p = new ParameterizedTh readStart(Call) ;
Thread t = new Thread(p);
t.SetApartmentS tate(ApartmentS tate.STA);
t.Start(0);

Console.ReadLin e();
}

static NLBService.NLBS ervice s = new ConsoleApplicat ion1.NLBService .NLBService();

static void Call(object o)
{
s.HelloWorldCom pleted += new ConsoleApplicat ion1.NLBService .HelloWorldComp letedEventHandl er(s_HelloWorld Completed);
s.HelloWorldAsy nc();
}

static void s_HelloWorldCom pleted(object sender, ConsoleApplicat ion1.NLBService .HelloWorldComp letedEventArgs e)
{
if (e.Error == null)
{
Console.WriteLi ne("ok");
}
else
{
Console.WriteLi ne("error");
}
}
}

Why does not this work?
If I want to use it synchronous it works fine, but I can not figure out, how to call a web service asynchronous from a thread that is different from the working thread.

Thank You

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