Cannot obtain Metadata from http://localhost:55408/ShopProcessService.svc

Question

I am getting the following error when trying to launch the WCF Test client for a service and is driving me crazy. I have searched the web and sounds like the DataContract Name of "HeaderRecord" exists twice in my project.

However, as doing a "find all" on this name only turned up one instance.

Can somebody please help me with this error. I'm at my wits end...

DataContract for type 'Ryder.Enterprise.DataTransferObjects.HeaderRecord[]' cannot be added to DataContractSet since type 'System.Collections.Generic.List`1[[Ryder.Enterprise.DataTransferObjects.HeaderRecord, Ryder.Enterprise.DataTransferObjects, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]]' with the same data contract name 'ArrayOfHeaderRecord' in namespace 'http://www.ABC.com/SOA/DataContracts/2014/02/17' is already present and the contracts are not equivalent.

There is also no instance in my project of a name called 'ArrayOfHeaderRecord'.

---

Bill Yeager

Answer 1

Check your app.config file and make sure there is no duplication of "HeaderRecord" DataContract.

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Gaurav Khanna | Microsoft VB.NET MVP | Microsoft Community Contributor

Answer 2

Just for giggles, I decided to remove the Operation and Service Contract for this particular call into the method, and the WCF Test client came up successfully. When I put the contracts back in, that's when I get the error, but I still don't know why???

I even went back to an old version of my source code for this method (when it was coming up in the WCF Test client) and that failed as well.

I rebooted my machine and same thing is occurring. I don't understand this error. Even if I put back the contracts and just have a "shell" of my class that it's calling, I get the same error.

I don't know what to do anymore???

---

Bill Yeager

Answer 3

EDIT 2 - Resolution
-------------------
After tracing down everything in my solution, I found what the error was...
My class was listed as follows: Notice the implementing of the List object which should not be there.

    public class HeaderRecordCollection : List<HeaderRecord>
     {
      private List<HeaderRecord> headerRecords;
   
   
   
      public HeaderRecordCollection()
      {
      }
   
   
      [DataMember(Name = "HeaderRecords")]
      public List<HeaderRecord> HeaderRecords
      {
       get
       {
        return headerRecords;
       }
       set
       {
        headerRecords = value;
       }
      }
     }

I simply removed that where I only have one list. Since now only having one list for the object, no complaints from WCF!

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Bill Yeager