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New Message on BDOTNET
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From: Mrinal
Message 4 in Discussion
Hi , I will try to give you some example on how to go about doing this ,
Since , you are trying to hide the asynchronous implementation from co -
developer , so you implement the aysnc calling in a separate middle layer class
and co - developer calls your method synchronously , now the point is till the
execution taking place on separate thread , if you don't make it responsive ,
then it will seem to be a synchronous call to end user . Have a look at this
Middle Layer code : public class MiddleLayer // Middle Layer Class { private
WebServiceAsyncCall webServiceAsyncCall ; // Web Service Object private int
webServiceReturnValue ; // Web Service Return Value
public WebApplicationAsyncMiddleLayer()
{webServiceAsyncCall = new WebServiceAsyncCall() ;}
public int CallWebWebserviceAsync(int firstValue,int secondValue)
{
AsyncCallback callBack = new AsyncCallback(CallBackMethod) ; // Call Back
Delegate
IAsyncResult ar =
webServiceAsyncCall.BeginHelloWorldCalculation(firstValue,secondValue,callBack,null)
;
while(!ar.IsCompleted)
{
// code to make things Responsive .
// Can call a client side Javascript for the purpose
}
return (webServiceReturnValue) ;
}
public void CallBackMethod(IAsyncResult ar)
{
webServiceReturnValue = webServiceAsyncCall.EndHelloWorldCalculation(ar) ;
}
}
Now the co - developer with synchronously call CallWebWebserviceAsync method ,
from where things will become asynchronous , as you can see the implementation
with AsyncCallBackDelegate , now as i have mentioned in the while loop , you
need to implement the code to give an asynchronous / responsive touch .
If you any doubts related to code , ping me back .
Now your questions :
1. By Asynchronous calling essentially you are using a separate thread for
execution , so that's it , you need not do anything explicitly with that and in
case way you have mentioned primary thread exits , then it is as good as your
webpage that is doing the processing going off / server going down , so you
can't do much in that except passing a this object while calling middle layer
and checking it for nullability before showing the final results .
2. Code Example shows clearly on how delegate object is created and passed
within the layer , infact in case you want some other layer / class method
being called then assign delegate the method in that class and you can create
delegate object in middle layer or pass it in constructor while invoking middle
layer , since delegate is a refernce type .
I hope this will help you .
any other doubt get back to me .
regards ,
Mrinal
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