Hello,
I am making an asynchronous call to a webservice and trying to update the
web page with the results.
The page is not updating.
Does anybody know why???
Below is my code:
public class ASPNetSuperhero : System.Web.UI.P age
{
protected System.Web.UI.W ebControls.Drop DownList drplstFilePaths ;
protected System.Web.UI.W ebControls.Text Box txtMessage;
protected System.Web.UI.W ebControls.Butt on btnStartFileSea rch;
private localhost.ASPNe tSuperheroServi ce GetWordCount;
protected System.Web.UI.W ebControls.Labe l lblWordCount;
private AsyncCallback MyWordCountCall back;
private void Page_Load(objec t sender, System.EventArg s e)
{
// Put user code to initialize the page here
}
#region Web Form Designer generated code
override protected void OnInit(EventArg s e)
{
//
// CODEGEN: This call is required by the ASP.NET Web Form Designer.
//
InitializeCompo nent();
base.OnInit(e);
}
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeCompo nent()
{
this.btnStartFi leSearch.Click += new
System.EventHan dler(this.btnSt artFileSearch_C lick);
this.Load += new System.EventHan dler(this.Page_ Load);
}
#endregion
private void btnStartFileSea rch_Click(objec t sender, System.EventArg s e)
{
MyWordCountCall back = new AsyncCallback(W ordCountCallbac k);
/* Create new instance of the webservice that provides
the required functionality*/
GetWordCount=ne w localhost.ASPNe tSuperheroServi ce();
GetWordCount.Be ginWordCount(My WordCountCallba ck,GetWordCount );
}
private void WordCountCallba ck(IAsyncResult Result)
{
// Call the webservice method in order to get current word count
this.txtMessage .Text=GetWordCo unt.EndWordCoun t(Result);
}
}
Regards,
TC 8 3018
if you are calling web service from an ASP.Net page on the server side, you
need wait till the call completes. use IAsynchResult.W aitHandle.WaitO ne()
check this if you need more info.. http://msdn.microsoft.com/library/de...ce09032002.asp
Av. http://www.avnrao.blogspot.com
"TC" <ge**********@y ahoo.com> wrote in message
news:uN******** ******@TK2MSFTN GP10.phx.gbl... Hello,
I am making an asynchronous call to a webservice and trying to update the web page with the results.
The page is not updating.
Does anybody know why???
Below is my code:
public class ASPNetSuperhero : System.Web.UI.P age { protected System.Web.UI.W ebControls.Drop DownList drplstFilePaths ; protected System.Web.UI.W ebControls.Text Box txtMessage; protected System.Web.UI.W ebControls.Butt on btnStartFileSea rch;
private localhost.ASPNe tSuperheroServi ce GetWordCount; protected System.Web.UI.W ebControls.Labe l lblWordCount; private AsyncCallback MyWordCountCall back;
private void Page_Load(objec t sender, System.EventArg s e) { // Put user code to initialize the page here }
#region Web Form Designer generated code override protected void OnInit(EventArg s e) { // // CODEGEN: This call is required by the ASP.NET Web Form Designer. // InitializeCompo nent(); base.OnInit(e); }
/// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> private void InitializeCompo nent() { this.btnStartFi leSearch.Click += new System.EventHan dler(this.btnSt artFileSearch_C lick); this.Load += new System.EventHan dler(this.Page_ Load);
} #endregion
private void btnStartFileSea rch_Click(objec t sender, System.EventArg s e) { MyWordCountCall back = new AsyncCallback(W ordCountCallbac k); /* Create new instance of the webservice that provides the required functionality*/ GetWordCount=ne w localhost.ASPNe tSuperheroServi ce(); GetWordCount.Be ginWordCount(My WordCountCallba ck,GetWordCount ); }
private void WordCountCallba ck(IAsyncResult Result) { // Call the webservice method in order to get current word count this.txtMessage .Text=GetWordCo unt.EndWordCoun t(Result); } }
Regards,
TC
Hey folks,
I need C# assistance for non-blocking, asynch callback from the web page.
I am currently receiving the appropriate values back but the page does not
update.
Does anyone know why?
Regards,
TC
"avnrao" <av*@newsgroups .com> wrote in message
news:O$******** ******@TK2MSFTN GP09.phx.gbl... if you are calling web service from an ASP.Net page on the server side,
you need wait till the call completes. use IAsynchResult.W aitHandle.WaitO ne() check this if you need more info.. http://msdn.microsoft.com/library/de...ce09032002.asp Av. http://www.avnrao.blogspot.com
"TC" <ge**********@y ahoo.com> wrote in message news:uN******** ******@TK2MSFTN GP10.phx.gbl... Hello,
I am making an asynchronous call to a webservice and trying to update
the web page with the results.
The page is not updating.
Does anybody know why???
Below is my code:
public class ASPNetSuperhero : System.Web.UI.P age { protected System.Web.UI.W ebControls.Drop DownList drplstFilePaths ; protected System.Web.UI.W ebControls.Text Box txtMessage; protected System.Web.UI.W ebControls.Butt on btnStartFileSea rch;
private localhost.ASPNe tSuperheroServi ce GetWordCount; protected System.Web.UI.W ebControls.Labe l lblWordCount; private AsyncCallback MyWordCountCall back;
private void Page_Load(objec t sender, System.EventArg s e) { // Put user code to initialize the page here }
#region Web Form Designer generated code override protected void OnInit(EventArg s e) { // // CODEGEN: This call is required by the ASP.NET Web Form Designer. // InitializeCompo nent(); base.OnInit(e); }
/// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> private void InitializeCompo nent() { this.btnStartFi leSearch.Click += new System.EventHan dler(this.btnSt artFileSearch_C lick); this.Load += new System.EventHan dler(this.Page_ Load);
} #endregion
private void btnStartFileSea rch_Click(objec t sender, System.EventArg s
e) { MyWordCountCall back = new AsyncCallback(W ordCountCallbac k); /* Create new instance of the webservice that provides the required functionality*/ GetWordCount=ne w localhost.ASPNe tSuperheroServi ce(); GetWordCount.Be ginWordCount(My WordCountCallba ck,GetWordCount ); }
private void WordCountCallba ck(IAsyncResult Result) { // Call the webservice method in order to get current word count this.txtMessage .Text=GetWordCo unt.EndWordCoun t(Result); } }
Regards,
TC
Hello,
ASP.NET application uses request/response architecture, and it may not be
suitable for asynchronous call to a web service. Regarding your code:
private void btnStartFileSea rch_Click(objec t sender, System.EventArg s e)
{
MyWordCountCall back = new AsyncCallback(W ordCountCallbac k);
/* Create new instance of the webservice that provides
the required functionality*/
GetWordCount=ne w localhost.ASPNe tSuperheroServi ce();
GetWordCount.Be ginWordCount(My WordCountCallba ck,GetWordCount );
}
After BeginWordCount, the response will be write back to client, won't wait
here. You have to use synchronous call here.
Luke
Microsoft Online Support
Get Secure! www.microsoft.com/security
(This posting is provided "AS IS", with no warranties, and confers no
rights.)
You initiate the call but don't wait for the result. The goal of an
asynchornous call is for example :
- make the call to a web service
- do some work
- get the result (will still wait if not already available)
That way you can do some work in parallel.
If you need the result from the webservice and you have nothing to do in
between making an asynchronous call is useless.
Patrice
"TC" <ge**********@y ahoo.com> a écrit dans le message de
news:uN******** ******@TK2MSFTN GP10.phx.gbl... Hello,
I am making an asynchronous call to a webservice and trying to update the web page with the results.
The page is not updating.
Does anybody know why???
Below is my code:
public class ASPNetSuperhero : System.Web.UI.P age { protected System.Web.UI.W ebControls.Drop DownList drplstFilePaths ; protected System.Web.UI.W ebControls.Text Box txtMessage; protected System.Web.UI.W ebControls.Butt on btnStartFileSea rch;
private localhost.ASPNe tSuperheroServi ce GetWordCount; protected System.Web.UI.W ebControls.Labe l lblWordCount; private AsyncCallback MyWordCountCall back;
private void Page_Load(objec t sender, System.EventArg s e) { // Put user code to initialize the page here }
#region Web Form Designer generated code override protected void OnInit(EventArg s e) { // // CODEGEN: This call is required by the ASP.NET Web Form Designer. // InitializeCompo nent(); base.OnInit(e); }
/// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> private void InitializeCompo nent() { this.btnStartFi leSearch.Click += new System.EventHan dler(this.btnSt artFileSearch_C lick); this.Load += new System.EventHan dler(this.Page_ Load);
} #endregion
private void btnStartFileSea rch_Click(objec t sender, System.EventArg s e) { MyWordCountCall back = new AsyncCallback(W ordCountCallbac k); /* Create new instance of the webservice that provides the required functionality*/ GetWordCount=ne w localhost.ASPNe tSuperheroServi ce(); GetWordCount.Be ginWordCount(My WordCountCallba ck,GetWordCount ); }
private void WordCountCallba ck(IAsyncResult Result) { // Call the webservice method in order to get current word count this.txtMessage .Text=GetWordCo unt.EndWordCoun t(Result); } }
Regards,
TC
Actually, the idea would be to free up the GUI so that a user isn't stuck.
That makes an asynch call very useful. Then the user can do whatever work
they wish to and when the webservice returns the appropriate information,
the application can finish the work behind the scenes.
At least this is what I am trying to do.
Todd
"Patrice" <no****@nowhere .com> wrote in message
news:uF******** ******@TK2MSFTN GP09.phx.gbl... You initiate the call but don't wait for the result. The goal of an asynchornous call is for example : - make the call to a web service - do some work - get the result (will still wait if not already available)
That way you can do some work in parallel.
If you need the result from the webservice and you have nothing to do in between making an asynchronous call is useless.
Patrice
"TC" <ge**********@y ahoo.com> a écrit dans le message de news:uN******** ******@TK2MSFTN GP10.phx.gbl... Hello,
I am making an asynchronous call to a webservice and trying to update
the web page with the results.
The page is not updating.
Does anybody know why???
Below is my code:
public class ASPNetSuperhero : System.Web.UI.P age { protected System.Web.UI.W ebControls.Drop DownList drplstFilePaths ; protected System.Web.UI.W ebControls.Text Box txtMessage; protected System.Web.UI.W ebControls.Butt on btnStartFileSea rch;
private localhost.ASPNe tSuperheroServi ce GetWordCount; protected System.Web.UI.W ebControls.Labe l lblWordCount; private AsyncCallback MyWordCountCall back;
private void Page_Load(objec t sender, System.EventArg s e) { // Put user code to initialize the page here }
#region Web Form Designer generated code override protected void OnInit(EventArg s e) { // // CODEGEN: This call is required by the ASP.NET Web Form Designer. // InitializeCompo nent(); base.OnInit(e); }
/// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> private void InitializeCompo nent() { this.btnStartFi leSearch.Click += new System.EventHan dler(this.btnSt artFileSearch_C lick); this.Load += new System.EventHan dler(this.Page_ Load);
} #endregion
private void btnStartFileSea rch_Click(objec t sender, System.EventArg s
e) { MyWordCountCall back = new AsyncCallback(W ordCountCallbac k); /* Create new instance of the webservice that provides the required functionality*/ GetWordCount=ne w localhost.ASPNe tSuperheroServi ce(); GetWordCount.Be ginWordCount(My WordCountCallba ck,GetWordCount ); }
private void WordCountCallba ck(IAsyncResult Result) { // Call the webservice method in order to get current word count this.txtMessage .Text=GetWordCo unt.EndWordCoun t(Result); } }
Regards,
TC
"TC" <ge**********@y ahoo.com> wrote in message
news:uN******** ******@TK2MSFTN GP10.phx.gbl... Hello,
I am making an asynchronous call to a webservice and trying to update the web page with the results.
The page is not updating.
Does anybody know why???
Yes. Your page does not exist when your callback is called.
private void WordCountCallba ck(IAsyncResult Result) { // Call the webservice method in order to get current word count this.txtMessage .Text=GetWordCo unt.EndWordCoun t(Result); } }
When this method is called back, the request has already completed, the
response has already been sent to the client, and you are out of luck.
I recommend that you find some sample code which does this and follow that
example. I can recommend it because you're not going to find any such sample
code - the entire idea is contrary to the way that ASP.NET works.
See http://msdn.microsoft.com/library/de...singstages.asp.
--
John Saunders
John.Saunders at SurfControl.com
Humm. Sorry if I restate something ovbious...
The page the user sees is just some HTML that is rendered by the server side
APSX page. Once the ASPX page is finished the user see client side HTML code
and the page doesn't exist any more server side. You nedd then another HTTP
request to be in touch again with server side code.
I see basically two options :
- you need the webservice call to be completed to have a meaningfull page :
- out of luck, needs to wait the result from the webservice to construct
the final HTML page
- use an IFRAME that calls an ASPX page that calls this webservice. The
user can see a part of the final UI (done by the main ASPX page) but will
have still to wait a bit to see the inner frame content(done be the ASPX
page referenced by the IFRAME). Of course, if the webservice is quite
qucik,, the first optino is probably still the simpler.
- you don't need the webservice call to be completed (will be used sometimes
later)
- you could queue these calls to have them done seperately from the user
page (AFAIK .NET proivides something along these lines was called MSMQ
previously)
Do you recognize a case in which you are ?
Patrice
"TC" <ge**********@y ahoo.com> a écrit dans le message de
news:es******** ******@TK2MSFTN GP11.phx.gbl... Actually, the idea would be to free up the GUI so that a user isn't stuck. That makes an asynch call very useful. Then the user can do whatever work they wish to and when the webservice returns the appropriate information, the application can finish the work behind the scenes.
At least this is what I am trying to do.
Todd
"Patrice" <no****@nowhere .com> wrote in message news:uF******** ******@TK2MSFTN GP09.phx.gbl... You initiate the call but don't wait for the result. The goal of an asynchornous call is for example : - make the call to a web service - do some work - get the result (will still wait if not already available)
That way you can do some work in parallel.
If you need the result from the webservice and you have nothing to do in between making an asynchronous call is useless.
Patrice
"TC" <ge**********@y ahoo.com> a écrit dans le message de news:uN******** ******@TK2MSFTN GP10.phx.gbl... Hello,
I am making an asynchronous call to a webservice and trying to update the web page with the results.
The page is not updating.
Does anybody know why???
Below is my code:
public class ASPNetSuperhero : System.Web.UI.P age { protected System.Web.UI.W ebControls.Drop DownList drplstFilePaths ; protected System.Web.UI.W ebControls.Text Box txtMessage; protected System.Web.UI.W ebControls.Butt on btnStartFileSea rch;
private localhost.ASPNe tSuperheroServi ce GetWordCount; protected System.Web.UI.W ebControls.Labe l lblWordCount; private AsyncCallback MyWordCountCall back;
private void Page_Load(objec t sender, System.EventArg s e) { // Put user code to initialize the page here }
#region Web Form Designer generated code override protected void OnInit(EventArg s e) { // // CODEGEN: This call is required by the ASP.NET Web Form Designer. // InitializeCompo nent(); base.OnInit(e); }
/// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> private void InitializeCompo nent() { this.btnStartFi leSearch.Click += new System.EventHan dler(this.btnSt artFileSearch_C lick); this.Load += new System.EventHan dler(this.Page_ Load);
} #endregion
private void btnStartFileSea rch_Click(objec t sender,
System.EventArg s e) { MyWordCountCall back = new AsyncCallback(W ordCountCallbac k); /* Create new instance of the webservice that provides the required functionality*/ GetWordCount=ne w localhost.ASPNe tSuperheroServi ce(); GetWordCount.Be ginWordCount(My WordCountCallba ck,GetWordCount ); }
private void WordCountCallba ck(IAsyncResult Result) { // Call the webservice method in order to get current word count this.txtMessage .Text=GetWordCo unt.EndWordCoun t(Result); } }
Regards,
TC
Hey Folks,
Thanks for the help!
Basically, because what I wish to do is contrary to the way in which ASP
works, I'm just gonna wait for the response to return.
Thanks Again,
TC
"Patrice" <no****@nowhere .com> wrote in message
news:eu******** ******@TK2MSFTN GP12.phx.gbl... Humm. Sorry if I restate something ovbious...
The page the user sees is just some HTML that is rendered by the server
side APSX page. Once the ASPX page is finished the user see client side HTML
code and the page doesn't exist any more server side. You nedd then another
HTTP request to be in touch again with server side code.
I see basically two options :
- you need the webservice call to be completed to have a meaningfull page
: - out of luck, needs to wait the result from the webservice to
construct the final HTML page - use an IFRAME that calls an ASPX page that calls this webservice.
The user can see a part of the final UI (done by the main ASPX page) but will have still to wait a bit to see the inner frame content(done be the ASPX page referenced by the IFRAME). Of course, if the webservice is quite qucik,, the first optino is probably still the simpler.
- you don't need the webservice call to be completed (will be used
sometimes later) - you could queue these calls to have them done seperately from the
user page (AFAIK .NET proivides something along these lines was called MSMQ previously)
Do you recognize a case in which you are ?
Patrice
"TC" <ge**********@y ahoo.com> a écrit dans le message de news:es******** ******@TK2MSFTN GP11.phx.gbl... Actually, the idea would be to free up the GUI so that a user isn't
stuck. That makes an asynch call very useful. Then the user can do whatever
work they wish to and when the webservice returns the appropriate
information, the application can finish the work behind the scenes.
At least this is what I am trying to do.
Todd
"Patrice" <no****@nowhere .com> wrote in message news:uF******** ******@TK2MSFTN GP09.phx.gbl... You initiate the call but don't wait for the result. The goal of an asynchornous call is for example : - make the call to a web service - do some work - get the result (will still wait if not already available)
That way you can do some work in parallel.
If you need the result from the webservice and you have nothing to do
in between making an asynchronous call is useless.
Patrice
"TC" <ge**********@y ahoo.com> a écrit dans le message de news:uN******** ******@TK2MSFTN GP10.phx.gbl... > Hello, > > I am making an asynchronous call to a webservice and trying to
update the > web page with the results. > > The page is not updating. > > Does anybody know why??? > > Below is my code: > > public class ASPNetSuperhero : System.Web.UI.P age > { > protected System.Web.UI.W ebControls.Drop DownList drplstFilePaths ; > protected System.Web.UI.W ebControls.Text Box txtMessage; > protected System.Web.UI.W ebControls.Butt on btnStartFileSea rch; > > private localhost.ASPNe tSuperheroServi ce GetWordCount; > protected System.Web.UI.W ebControls.Labe l lblWordCount; > private AsyncCallback MyWordCountCall back; > > private void Page_Load(objec t sender, System.EventArg s e) > { > // Put user code to initialize the page here > } > > #region Web Form Designer generated code > override protected void OnInit(EventArg s e) > { > // > // CODEGEN: This call is required by the ASP.NET Web Form
Designer. > // > InitializeCompo nent(); > base.OnInit(e); > } > > /// <summary> > /// Required method for Designer support - do not modify > /// the contents of this method with the code editor. > /// </summary> > private void InitializeCompo nent() > { > this.btnStartFi leSearch.Click += new > System.EventHan dler(this.btnSt artFileSearch_C lick); > this.Load += new System.EventHan dler(this.Page_ Load); > > } > #endregion > > private void btnStartFileSea rch_Click(objec t sender, System.EventArg s e) > { > MyWordCountCall back = new AsyncCallback(W ordCountCallbac k); > /* Create new instance of the webservice that provides > the required functionality*/ > GetWordCount=ne w localhost.ASPNe tSuperheroServi ce(); > GetWordCount.Be ginWordCount(My WordCountCallba ck,GetWordCount ); > } > > private void WordCountCallba ck(IAsyncResult Result) > { > // Call the webservice method in order to get current word count > this.txtMessage .Text=GetWordCo unt.EndWordCoun t(Result); > } > } > > > Regards, > > TC > >
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