Retaining data between web service calls

[RJ]

I tried using the Application object to store data in some variables, which
would be globally accessible within the web service application code. On
subsequent web method calls, the Application object no longer contains the
variables I added. Is the Application object supposed to work the way it
does in a web page?

I was just attempting to read the web.config file once at startup. Now I am
just reading the web.config file in every web method, on every call to the
web service. Should I have to do this? Thanks for any insights.

RJ

[Sami Vaaraniemi]

"RJ" <[e-mail]> wrote in message
news:uB**************@tk2msftngp13.phx.gbl...

I tried using the Application object to store data in some variables, which would be globally accessible within the web service application code. On
subsequent web method calls, the Application object no longer contains the
variables I added. Is the Application object supposed to work the way it
does in a web page?

I was just attempting to read the web.config file once at startup. Now I am just reading the web.config file in every web method, on every call to the
web service. Should I have to do this? Thanks for any insights.

RJ

The Application object should work the same way it works in any ASP.NET
application: the values stored in it are remembered from request to request.
The Application object loses the values when the application restarts. Are
you sure the application is not restarting between calls for some reason?
Btw there is no need for you to enable SessionState in order to use the
Application object.

I did a small test with this web method:

[WebMethod]
public int TestApplicationState()
{
if (Application["MyKey"] == null)
{
Application["MyKey"] = 0;
}

int value = (int)Application["MyKey"] + 1;
Application["MyKey"] = value;
return value;
}

Subsequent calls from my client to the above web method return values 1, 2,
3... as expected. (Note that the code is not thread safe but that's another
story).

Regards
Sami

[RJ]

Sami,
Thanks for performing the test. I have not enabled SessionState. I am
simply adding values to the Application object in the Application_Start
event handler method. Seconds later, I call other web methods in this web
service, which attempt to access the Application object by key ( Dim myVar
as String = Me.Application("Name") .... in VB.NET)
I immediately print out the value of myVar and it is never set. I am
assuming that Application_Start is called once before the first call to any
web method? Is this approach sound, or should I add the values to the
Application object somewhere else in the web service code?

"Sami Vaaraniemi" <sa**********@pleasejippii.fi> wrote in message
news:OU*************@TK2MSFTNGP09.phx.gbl...

"RJ" <[e-mail]> wrote in message
news:uB**************@tk2msftngp13.phx.gbl...

I tried using the Application object to store data in some variables, which

would be globally accessible within the web service application code. On subsequent web method calls, the Application object no longer contains the variables I added. Is the Application object supposed to work the way it does in a web page?

I was just attempting to read the web.config file once at startup. Now I am

just reading the web.config file in every web method, on every call to

the web service. Should I have to do this? Thanks for any insights.

RJ

The Application object should work the same way it works in any ASP.NET
application: the values stored in it are remembered from request to

request. The Application object loses the values when the application restarts. Are
you sure the application is not restarting between calls for some reason?
Btw there is no need for you to enable SessionState in order to use the
Application object.

I did a small test with this web method:

[WebMethod]
public int TestApplicationState()
{
if (Application["MyKey"] == null)
{
Application["MyKey"] = 0;
}

int value = (int)Application["MyKey"] + 1;
Application["MyKey"] = value;
return value;
}

Subsequent calls from my client to the above web method return values 1, 2, 3... as expected. (Note that the code is not thread safe but that's another story).

Regards
Sami

[Sami Vaaraniemi]

"RJ" <[e-mail]> wrote in message
news:OT*************@TK2MSFTNGP11.phx.gbl...

Sami,
Thanks for performing the test. I have not enabled SessionState. I am
simply adding values to the Application object in the Application_Start
event handler method. Seconds later, I call other web methods in this web
service, which attempt to access the Application object by key ( Dim myVar
as String = Me.Application("Name") .... in VB.NET)
I immediately print out the value of myVar and it is never set. I am
assuming that Application_Start is called once before the first call to any web method? Is this approach sound, or should I add the values to the
Application object somewhere else in the web service code?

Yes, Application_Start is called once on the first request to a web
application.

I suggest you put in the test code in my previous post to see how it behaves
for you. If it works then the Application object is working the way it is
documented.

Some additional things I'd do to debug the problem:

- Make sure you access the Application object from same web application that
sets it (same virtual directory)
- Are you running a web farm? If so, then Application won't work.
- Put break points in event handlers in Global to trace a request. Check the
contents of Application on every break, or
- Add code to event handlers in Global to print out all the values in
Application:

foreach (string key in Application.Keys)
{
System.Diagnostics.Trace.WriteLine(string.Format(" key: {0} value: {1}",
key, Application[key]);
}

hth,
Sami

[jackstraw10]

Sami-

I am having the same problem, my wp recycles after every call and
cannot figure out how to stop it from happening. I implemented you
code and have a client that makes the consecutive calls. Each respons
is 1, and the Application_Start and Application_End calls are made fo
every call. Any ideas?

Sami Vaaraniemi wrote:

*"RJ" <[e-mail]> wrote in message
news:uB**************@tk2msftngp13.phx.gbl...

I tried using the Application object to store data in som

variables,
which

would be globally accessible within the web service applicatio

code. On

subsequent web method calls, the Application object no longe

contains the

variables I added. Is the Application object supposed to work th

way it

does in a web page?

I was just attempting to read the web.config file once at startup.

Now I
am

just reading the web.config file in every web method, on every cal

to the

web service. Should I have to do this? Thanks for any insights.

RJ

The Application object should work the same way it works in an
ASP.NET
application: the values stored in it are remembered from request t
request.
The Application object loses the values when the applicatio
restarts. Are
you sure the application is not restarting between calls for som
reason?
Btw there is no need for you to enable SessionState in order to us
the
Application object.

I did a small test with this web method:

[WebMethod]
public int TestApplicationState()
{
if (Application["MyKey"] == null)
{
Application["MyKey"] = 0;
}

int value = (int)Application["MyKey"] + 1;
Application["MyKey"] = value;
return value;
}

Subsequent calls from my client to the above web method return value
1, 2,
3... as expected. (Note that the code is not thread safe but that'
another
story).

Regards
Sami

-
jackstraw1
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[Sami Vaaraniemi]

"jackstraw10" <ja****************@mail.mcse.ms> wrote in message
news:ja****************@mail.mcse.ms...

Sami-

I am having the same problem, my wp recycles after every call and I
cannot figure out how to stop it from happening. I implemented your
code and have a client that makes the consecutive calls. Each response
is 1, and the Application_Start and Application_End calls are made for
every call. Any ideas?

That's pretty odd. Is there anything in the event log that would give a hint
as to why the app is shutting down? Look at error messages and messages
where the source is W3SVC.

Regards,
Sami