February 2003
Intermediate to advanced
752 pages
16h 35m
English
book
Microsoft® .NET Distributed Applications: Integrating XML Web Services and .NET Remoting
by Matthew MacDonald
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Callbacks
Callbacks are one of the preferred ways to handle asynchronous calls because they simplify your code and eliminate the overhead of having to continuously poll a request that is in progress to see whether it has completed. The second-to-last parameter of the BeginInvoke method (or BeginMethodName in an XML Web service proxy class) accepts a reference to the method that you want triggered when the method call is complete.
To use a callback successfully, your callback method must have the same signature as the System.AsyncCallback delegate. That means it needs to accept a single IAsyncResult parameter. Here’s an example:
Public Sub AsyncCallback(ByVal ar As IAsyncResult) ‘ (This code will be triggered when the method call is complete.) ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.