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POAccessing asmx WebService Using WCF
 

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    <p>I am trying to access an old ASMX webservice using WCF by calling the <code>ChannelFactory.CreateChannel()</code> method.</p> <p>If the web service is created by WCF, everything is straightforward. I can instantiate the proxy client generated by the svcutil tool, or manually call the <code>ChannelFactory.CreateChannel()</code> method. Afterwards, I can call the web service methods the same way for both scenarios.</p> <p>But if the web service is of the old ASMX variety, I can still instantiate the proxy either way, but I am unable to call the same web service method.</p> <p>For example, assume this basic WCF web service interface:</p> <pre><code>[ServiceContract] public interface IWebService { [OperationContract] string HelloWorld(); } </code></pre> <p>After using <code>svcutil</code> to generate the proxy, I can call <code>HelloWorld()</code> one of 2 ways:</p> <pre><code>WebServiceClient proxy = new ServiceReference.WebServiceClient(); textBox1.Text += proxy.HelloWorld(); </code></pre> <p>or:</p> <pre><code>ChannelFactory&lt;ServiceReference.IWebService2&gt; cfactory = new ChannelFactory&lt;ServiceReference.IWebService&gt;("BasicHttpBinding_IWebService"); ServiceReference.IWebService proxy = cfactory.CreateChannel(); ((IClientChannel)proxy).Open(); textBox1.Text += proxy.HelloWorld(); </code></pre> <p>Now assume this ASMX web service:</p> <pre><code>[WebService(Namespace = "http://tempuri.org/")] [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] public class WebService : System.Web.Services.WebService { public WebService() { } [WebMethod] public string HelloWorld() { return "Hello World"; } } </code></pre> <p>Calling <code>HelloWorld()</code> using the <code>SoapClient</code> generated by <code>svcutil</code> tool is nearly the same as if it were a WCF web service:</p> <pre><code>WebServiceSoapClient proxy = new ServiceReference.WebServiceSoapClient(); textBox1.Text += proxy.HelloWorld(); </code></pre> <p>But trying to call <code>HelloWorld()</code> if you create the channel yourself and you will get an error:</p> <pre><code>ChannelFactory&lt;ServiceReference.WebServiceSoap&gt; cfactory = new ChannelFactory&lt;ServiceReference.WebServiceSoap&gt;("WebServiceSoap"); ServiceReference.WebServiceSoap proxy = cfactory.CreateChannel(); ((IClientChannel)proxy).Open(); textBox1.Text += proxy.HelloWorld(); </code></pre> <p>The error is "No overload for method HelloWorld takes 0 arguments".</p> <p>It appears it is because the <code>HelloWorld</code> method in the autogenerated interface <code>(ServiceReference.WebServiceSoap)</code> takes an argument of type <code>ServiceReference.HelloWorldRequest</code>.</p> <p>So in the end, I was only able to make it work by looking through the <code>svcutil</code> generated code and change my implementation to this:</p> <pre><code>ChannelFactory&lt;ServiceReference.WebServiceSoap&gt; cfactory = new ChannelFactory&lt;ServiceReference.WebServiceSoap&gt;("WebServiceSoap"); ServiceReference.WebServiceSoap proxy = cfactory.CreateChannel(); ((IClientChannel)proxy).Open(); ServiceReference.HelloWorldRequest inValue = new WCFConsumeWebServices.ServiceReference.HelloWorldRequest(); inValue.Body = new WCFConsumeWebServices.ServiceReference.HelloWorldRequestBody(); ServiceReference.HelloWorldResponse retVal = proxy.HelloWorld(inValue); textBox1.Text += retVal.Body.HelloWorldResult; </code></pre> <p>Is this how it is suppose to be?</p> <p>For one type of basic http web service, we get to use virtually the same code to call a method, but for another we need to muck through the generated proxy code and have different implementation depending on how you open the channel ?</p>
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