使用WCF将复杂类型传递给Windows服务

Question

I have a windows service and winform front end app. I need to be able to call and pass data round trip to methods in the service. I have accomplished this by defining an interface and can pass strings without issue.

[ServiceContract]
public interface IStringReverser
{
    [DataContractFormat]
    [OperationContract]
    string ReverseString(string value);
}

I am now trying to return a complex data type and have altered the code as such:

[ServiceContract]
public interface IStringReverser
{
    [DataContractFormat]
    [OperationContract]
    DTO ReverseString(string value);
}

[Serializable]
public class DTO
{
    public int Id { get; set; }
    public string Name { get; set; }
}

My implementation is as such:

public class StringReverser : IStringReverser
{
    public DTO ReverseString(string value)
    {
        char[] retVal = value.ToCharArray();
        int idx = 0;
        for (int i = value.Length - 1; i >= 0; i--)
            retVal[idx++] = value[i];

        var dto = new DTO();
        dto.Name = retVal.ToString();
        dto.Id = 122;
        return dto;
    }
}

I am not particular how the data gets transferred. I am getting an error:

The formatter threw an exception while trying to deserialize the message: There was an error while trying to deserialize parameter http://tempuri.org/:ReverseStringResult . The InnerException message was ''EndElement' 'ReverseStringResult' from namespace ' http://tempuri.org/ ' is not expected. Expecting element '_x003C_Id_x003E_k__BackingField'.'. Please see InnerException for more details.

In the winform I am creating the connection with this:

private IStringReverser pipeProxy;
    public Form1()
    {
        InitializeComponent();

        ChannelFactory<IStringReverser> httpFactory =
            new ChannelFactory<IStringReverser>(
              new BasicHttpBinding(),
              new EndpointAddress(
                "http://localhost:8000/Reverse"));

        ChannelFactory<IStringReverser> pipeFactory =
            new ChannelFactory<IStringReverser>(
              new NetNamedPipeBinding(),
              new EndpointAddress(
                "net.pipe://localhost/PipeReverse"));

        //IStringReverser httpProxy = httpFactory.CreateChannel();
        pipeProxy = pipeFactory.CreateChannel();
    }

I don't understand the error message or how to correct it. How do I define how it gets deserialized? Is the serialization ok?

Answer 1

Use Data Contracts:

[DataContract]
public class DTO
{
    [DataMember]
    public int Id { get; set; }
    [DataMember]
    public string Name { get; set; }
}