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    <p>WCF (and the older asmx-based web services) do a lot of the serialisation tasks for you. You can return objects from methods, and the framework will serialise those objects into the correct format XML and provide clients with the wsdl so they can call your webservice methods and understand what they're getting back.</p> <p>You <em>could</em> do this with a web <strong>page</strong> (I bet there are loads of PHP "web services" out there), but you'd have to do all that plumbing yourself.</p> <p>The type of request thing is WCF-magic. WCF has the notion of "endpoints" that allow you to separate the method of calling the service from what the service does. It's just a better (though many thing very complex) architecture that better separates those two concerns.</p> <p>I doubt the performance bottleneck of any webservice would be the choice to use asmx rather than WCF. The performance penalties in web service architecture are almost always due to chatty interfaces and/or very large objects/object graphs. The very fact you're making a remote call to a webservice makes the difference in speed of WCF vs. asmx insignificant in most cases. WCF is more flexible in design, which is a valid reason to chose it. WCF does use the newer <code>DataContractSerializer</code> rather than the older method employed in axms, and supposedly it's a bit faster. I think you'd have to scale to quite a lot of users to see a meaningful difference though - you'd be better off looking for chatty interfaces and poorly performing db queries first.</p> <p>Of course, if in doubt - measure first, then target specific areas of poor performance.</p>
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    1. POWeb Service VS. Aspx Pages: Pros and Cons
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    1. USNeil Barnwell
    1. USNeil Barnwell
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    1. COThats true. WCF's serialization techniques are supposed to perform faster than an asmx web service as well, right?
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      1. USyourbuddypal
    2. COMeh. Maybe a bit, but I doubt the performance bottleneck of any webservice would be the choice to use asmx rather than WCF. The performance penalties in web service architecture are almost always due to chatty interfaces and/or very large objects/object graphs. The very fact you're making a remote call to a webservice makes the difference in speed of WCF vs. asmx insignificant in most cases. WCF is more flexible in design, which is a valid reason to chose it.
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      1. USNeil Barnwell
    3. CORe: serializers, WCF's DataContractJsonSerializer is actually less flexible than ASMX's JavaScriptSerializer by default. JSS will accept dates and enums as strings, but DCJS won't. That's especially tedious/troublesome when it comes to the dates.
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      1. USDave Ward
 

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