WCF streaming service that returns the length of the stream and includes input parameters

Question

I am trying to create a WCF streaming service. I have two requirements that I seem to stumble in trying to get this to work:

• Stream size length
• Input parameters

The contract for my message is as follows:

[MessageContract]
public class MyStream
{
 [MessageHeader]
 public long StreamSize;

 [MessageBodyMember]
 public Stream StreamData;
}  

My job contract is as follows:

[ServiceContract]
public interface IStreamService
{
     [OperationContract]
     MyStream GetData(string data);
}

The error message that I get when I try to use the web service is as follows:

The GetData operation cannot be because it has a parameter or return type type System.ServiceModel.Channels.Message or a type that has MessageContractAttribute and other parameters of different types. when using System.ServiceModel.Channels.Message or types with MessageContractAttribute, the method should not use other types of Parameters.

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Answer 1

MessageContract .

[MessageContract]
public class GetDataRequest
{
  [MessageBodyMember(Name="data")]
  public string Data { get; set; }
}

:

[OperationContract]
MyStream GetData(GetDataRequest request);