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POHow to generate client-side code for multiple WCF services with shared types
 

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  1. POHow to generate client-side code for multiple WCF services with shared types
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    <p>I have multiple WCF services that share some data contracts and need to generate client-side code using svcutil.exe. I've run into errors using two most obvious ways to do this and need some help.</p> <p>But first, here are the services:</p> <pre><code>[ServiceContract( Namespace = "http://www.me.com/services/" )] public interface IFooService { [OperationContract] Response RunFoo( Request request ); } [ServiceContract( Namespace = "http://www.me.com/services/" )] public interface IBarService { [OperationContract] Response RunBar( Request request ); } </code></pre> <p>Response and Request are defined in a separate assembly:</p> <pre><code>[DataContract( Namespace = "http://www.me.com/shared/" )] public class Request { [DataMember] public int Input { get; set; } } [DataContract( Namespace = "http://www.me.com/shared/" )] public class Response { [DataMember] public int Result { get; set; } } </code></pre> <p>The services are implemented in some trivial way, compiled, published - let's switch to the client side now.</p> <p>Including both services on the svcutil command line - like this:</p> <pre><code>svcutil /o:Client.cs http://hostname.com/FooService.svc http://hostname.com/BarService.svc </code></pre> <p>will result in numerous error messages about duplicated data types, starting with</p> <blockquote> <p>Error: There was a validation error on a schema generated during export: Source: Line: 1 Column: 9087 Validation Error: The global element '<a href="http://schemas.microsoft.com/2003/10/Serialization/:anyType" rel="noreferrer">http://schemas.microsoft.com/2003/10/Serialization/:anyType</a>' has already been declared.</p> </blockquote> <p>and ending with</p> <blockquote> <p>Error: There was a validation error on a schema generated during export: Source: Line: 1 Column: 12817 Validation Error: The complexType '<a href="http://www.me.com/shared/:Response" rel="noreferrer">http://www.me.com/shared/:Response</a>' has already been declared.</p> </blockquote> <p>Generating a client-side file separately for each service avoids these errors:</p> <pre><code>svcutil /o:Foo.cs http://hostname.com/FooService.svc svcutil /o:Bar.cs http://hostname.com/BarService.svc </code></pre> <p>But then definitions of shared types (such as Request and Response) will be duplicated in Foo.cs and then in Bar.cs, resulting obviously in compiler errors.</p> <p>So, <strong>what is the conventional way to generate client-side code consuming such services</strong>?</p> <p>Limitations:</p> <ul> <li>cannot ship an assembly containing shared types to the client (so that they could use svcutil.exe's /r option)</li> <li>cannot use the "Add Service Reference..." command in Visual Studio - need an svcutil command line (or another command-line tool).</li> </ul>
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