My environment:  VS 2k5 Team Software developer SP1, VB.Net, Web Service

I have a web service.  I also have another class file.  I am trying to call 
a web service operation from within my private class file on another thread.

In my class file I have this

Private Sub MyPrivateSub()

  Dim serv1 as MyWebServiceClass

  Dim t1 as New System.Threading.Thread( _
      New System.Threading.ThreadStart( _
          AddressOf serv1.Operation1))

End Sub

I can't get past that line to create the thread.  The error is

Method 'Public Function Operation1(byval Param1 as Object) as ReturnObject' 
doesn't have the same signature as delegate 'Delegate Sub ThreadStart()'

The web serivce class has a parameter-less constructor.

Thanks for any help.

-- 
Mike Logan

On Aug 22, 3:34 pm, Mike Logan <MikeLo...@community.nospam> wrote:


> Method 'Public Function Operation1(byval Param1 as Object) as ReturnObject'
> doesn't have the same signature as delegate 'Delegate Sub ThreadStart()'


The error message isn't kidding. The signatures really are different.
Just look:

Sub ThreadStart()
vs
Function Operation1(byval Param1 as Object) as ReturnObject

You have to match the signature to be able to use the method as a
ThreadStart. The reason you can't return anything in the method is
that there's no control over the receiving end, so the returned object
would wind up nowhere.

If you can live with using the managed thread pool, you can use
delegates instead, which will give you easier access to function-like
behavior. Otherwise, the other delegate usable in Thread.Start() might
be of interest (but that one doesn't return anything either).

Hi Mike,

Does Tomten's suggestion help you on this problem? For creating custom 
thread which take a ThreadStart function, you need to define a function 
with the required signature of "ThreadStart delegate"(it is a void 
function):

#ThreadStart Delegate
http://msdn2.microsoft.com/en-us/library/system.threading.threadstart.aspx

or if you want your thread function be able to accept some additional 
parameters, you can choose the new "ParameterizedThreadStart delegate":

#ParameterizedThreadStart Delegate
http://msdn2.microsoft.com/en-us/library/system.threading.parameterizedthrea
dstart.aspx

BTW, for webservice client proxy, you can also use  
proxy.BeginXXXX/proxy.EndXXX methods   or the new proxy.XXXXAsync pattern 
to do asynchronous webservice call, these calles are also executed on 
another threadpool thread. 

#New Event-Based Model For Asynchronous WebMethod Calls
http://quickstarts.asp.net/QuickStartv20/webservices/doc/RADAsync.aspx

Does this also help for your case?

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead

 

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