如何直接在 WCF Response 对象中返回多个字段，而不是包装在另一个对象中？

Question

How can i return a response from a WCF service with fields directly in the Response object, rather than wrapped in a Result object within the Response object?

I inherited and maintain WCF service that is working well. I've been asked to add a passthru method that does something, then routes a request to another existing service (maintained by someone else), then returns the result as-is. The part i'm trying to solve is that the existing service returns loose fields within their response object, but WCF appears to want me to return a single value (or values wrapped in an object).

How might i either:

• return multiple loose fields in the methodResponse object, or
• intercept the methodResponse and build/write it myself,
• something else to pass back the result as is?

Example, i want to return this (ie what's returned from the other service)

<soap:Body>
    <MethodResponse>
        <Value1>123</Value1>
        <Value2>abc</Value2>
        <Value3>http://123.com</Value3>
        <Value4>Success</Value4>
    </MethodResponse>
</soap:Body>

instead of this

<soap:Body>
    <MethodResponse>
        <MethodResult>
            <Value1>123</Value1>
            <Value2>abc</Value2>
            <Value3>http://123.com</Value3>
            <Value4>Success</Value4>
        </MethodResult>
    </MethodResponse>
</soap:Body>

Answer 1

If the MessageContractAttribute is not used in the service operation signature, WCF will create a wrapper element to save the parameters in the SOAP body. This is the default WCF behavior.

The solution is to use [MessageContract] on the object.

Here is my demo:

[MessageContract]
public class MethodResponse
{
    [MessageBodyMember]
    public string value1 { get; set; }
    [MessageBodyMember]
    public string value2 { get; set; }
    [MessageBodyMember]
    public string value3 { get; set; }
}

The above class is the class returned by the server.

This is the message received by the client.

For more information about MessageContract,Please refer to the following link:

https://docs.microsoft.com/en-us/dotnet/framework/wcf/feature-details/using-message-contracts

Feel free to let me know if the problem persists.

This is my code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.ServiceModel.Description;
using System.Text;
using System.Threading.Tasks;
using static ConsoleApp65.soap;

namespace ConsoleApp65
{
    [MessageContract]
    public class MethodResponse
    {
        [MessageBodyMember]
        public string value1 { get; set; }
        [MessageBodyMember]
        public string value2 { get; set; }
        [MessageBodyMember]
        public string value3 { get; set; }
    }
  
    [ServiceContract]
    public interface Test
    {
        [OperationContract]
        MethodResponse Test();
    }
    public class TestService : Test
    {
        public MethodResponse Test()
        {
            MethodResponse data = new MethodResponse();
            data.value1 = "1";
            data.value2 = "2";
            data.value3 = "3";
            return data;
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            // Step 1: Create a URI to serve as the base address.
            Uri baseAddress = new Uri("http://localhost:8000/GettingStarted/");

            // Step 2: Create a ServiceHost instance.
            ServiceHost selfHost = new ServiceHost(typeof(TestService), baseAddress);

            try
            {
                // Step 3: Add a service endpoint.
                selfHost.AddServiceEndpoint(typeof(Test), new WSHttpBinding(), "CalculatorService");

                // Step 4: Enable metadata exchange.
                ServiceMetadataBehavior smb = new ServiceMetadataBehavior();
                smb.HttpGetEnabled = true;
                selfHost.Description.Behaviors.Add(smb);

                // Step 5: Start the service.
                selfHost.Open();
                Console.WriteLine("The service is ready.");

                // Close the ServiceHost to stop the service.
                Console.WriteLine("Press <Enter> to terminate the service.");
                Console.WriteLine();
                Console.ReadLine();
                selfHost.Close();
            }
            catch (CommunicationException ce)
            {
                Console.WriteLine("An exception occurred: {0}", ce.Message);
                selfHost.Abort();
            }
        }
    }
}