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Method overloading in WCF

, 19 Dec 2010 CPOL
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Method overloading in WCF
I found a scenario where I have to implement two methods with the same name, i.e Function overloading. But when I implement that, I got an error "System.InvalidOperationException"
System.InvalidOperationException: Cannot have two operations in the same 
contractwith the same name, methods GetData and GetData in type 
WcfServiceLibrary.IService1 violate this rule.

To resolve this issue, you just need to use a meaningful name for the method by using NAME field available in OperationContract attribute. So you need to give a name to both or one of the methods to avoid this problem. As you can see in the below code that I did in control IService.cs interface.
        [OperationContract(Name = "GetIntegerData")]
        string GetData(int value);
        [OperationContract(Name = "GetStringData")]
        string GetData(string value);
So after doing the change, I get live service but the name of the method gets change by the name specified in the  Name attribute which you can see in the below image:

So to consume service in my client application, you need to use the method name you specified in the Name attribute. The code in my client application is:
            ServiceReference1.Service1Client client = new Client.ServiceReference1.Service1Client();
You can easily resolve the issue of method overloading in WCF service with the help of Name field in OperationContract attribute.


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Pranay Rana
Software Developer (Senior) GMind Solusion
India India

Microsoft C# MVP (12-13)

Hey, I am Pranay Rana, working as a ITA in MNC. Web development in Asp.Net with C# and MS sql server are the experience tools that I have had for the past 5.5 years now.
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Comments and Discussions

GeneralMy vote of 5 Pinmemberparminder sidhu30-Jan-14 2:06 
GeneralMy vote of 1 [modified] PinmemberMarcelo Lujan [El Bebe.Net ]2-May-12 14:43 
GeneralReason for my vote of 2 If all calls to the method have to u... PinmemberRyan Gamal17-Jan-11 0:36 
GeneralReason for my vote of 5 Good One! PinmemberAnupama Roy11-Jan-11 19:22 

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