WCF新手问题：从JavaScript调用方法

Question

Greetings!

I'm new to WCF and I thought it would be similar to ASP.NET web services, but I'm unable to call a method from client-side JavaScript. My web form looks like this:

<form id="form1" runat="server">
   <div>
      <asp:ScriptManager ID="ScriptManager1" runat="server">
         <Scripts>
            <asp:ScriptReference Path="~/test.js" />
         </Scripts>
         <Services>
            <asp:ServiceReference Path="~/MyService.svc" />
         </Services>
      </asp:ScriptManager>
   </div>
   <button onclick="test()">Click Me</button>
</form>

My service's interface looks like this:

namespace Test
{
    [ServiceContract(Namespace = "Test")]
    public interface IMyService
    {
        [OperationContract]
        void DoWork();

        [OperationContract]
        string SayHi();
    }
}

And here's its implementation:

namespace Test
{
    [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
    public class MyService : IMyService
    {
        public void DoWork()
        {
        }

        public string SayHi()
        {
            return "Hello, World!";
        }
    }
}

And finally the JavaScript:

function test() {
    Test.MyService.SayHi(SayHiSuccess, SayHiError);
}

function SayHiSuccess(result) {
    alert(result[0]);
}

function SayHiError(error) {
    alert(error.toString());
}

It appears that the service's SayHi() method never executes, although I'm not sure why or how to being troubleshooting. Any suggestions?

Answer 1

You didn't post your web.config contents. What binding are you using? You should probably be using webHttpBinding .

Also, it may help to know your .svc file contents. Although I've never tried it, I understand that you don't have to modify web.config at all if you use WebScriptServiceHostFactory as your service host factory. That's as simple as modifying your .svc file as follows:

<%@ ServiceHost Service="MyService"
    Factory="System.ServiceModel.Activation.WebScriptServiceHostFactory"
 %>

If all else fails, here are some resources for you:

• Calling WCF Service from Javascript
• Create a Simple WCF Web...

Answer 2

Your code looks OK. Should be working by right. You could try adding the WebService and the WebMethod attributes as well.

For debugging a WCF web service I normally use Fiddler to track HTTP calls while running the WCF code with a debugger attached (run in Visual Studio in most cases).