Is SoapHttpClientProtocol thread safe?

Question

I created a Web Service proxy with the "add web reference" feature of VS 2008 (c#).

The generated class derives from SoapHttpClientProtocol

Can I store only one instance of my proxy in a singleton? Is it thread safe? Is there state between calls that would prevent me from doing this?

Answer 1

MSDN says that SoapHttpClientProtocol is thread safe:

Thread Safety

This type is thread safe.

For another class like System.Windows.Forms which isn't thread-safe, MSDN says,

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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Here is a Microsoft/MSDN employee saying (though without guarantee) that it is thread-safe:

Hi Max,

For the webservice proxy, I think it should be thread-safe as the .NET generated proxy class is derived from the "SoapHttpClientProtocol" class which is marked as thread-safe in document:

SoapHttpClientProtocol Class

http://msdn.microsoft.com/en-us/library/system.web.services.protocols.soaphttpclientprotocol(VS.71).aspx

therefore, it should be safe to use it in multi-thread context as long as you haven't manually add any context-sensitive member in the derived proxy class. Do you think so?

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead

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