WCF:使用 System.ServiceModel.Channels.Message 类的问题？

Question

我正在尝试对原始消息使用 WCF 服务。

1)WCF服务代码:

[DataContract]
public class Person
{
    [DataMember]
    public int Id { get; set; }

    [DataMember]
    public string FirstName { get; set; }

    [DataMember]
    public string LastName { get; set; }
}

public static List<Person> CreateEmployees()
{
    List<Person> lstPersons = new List<Person>()
    {
        new Person { Id = 1, FirstName = "Andrey", LastName = "Andreyev" },
        new Person { Id = 2, FirstName = "Sergey", LastName = "Sergeyev" }
    };

    return lstPersons;
}

[ServiceContract]
public interface ITestService
{
    [OperationContract(Action = TestService.RequestAction, ReplyAction = TestService.ReplyAction)]
    Message GetPersonById(Message id);
}

public class TestService : ITestService
{
    public const String ReplyAction = "http://localhost:4249/Message_ReplyAction";
    public const String RequestAction = "http://localhost:4249/Message_RequestAction";

    public Message GetPersonById(Message id)
    {
        string firstName = Employees.CreateEmployees().First(e => e.Id == id.GetBody<int>()).FirstName;
        Message response = Message.CreateMessage(id.Version, ReplyAction, firstName);
        return response;
    }
}

2) 客户端代码:

static void Main(string[] args)
{
    TestServiceClient client = new TestServiceClient();
    String RequestAction = "http://localhost:4249/Message_RequestAction";
    int value = 1;
    Message request = Message.CreateMessage(MessageVersion.Default, RequestAction, value);
    Message reply = client.GetPersonById(request);
    string firstName = reply.GetBody<string>();

    Console.WriteLine(firstName);
    client.Close();
}

当我运行客户端时:int value = 1 一切正常。但是，当我使用:int value = 2 时，出现以下错误:

System.Runtime.Serialization.SerializationException 未处理 Message="第 1 行位置 276 出错。期望来自命名空间'http://schemas.microsoft.com/2003/10/Serialization/'的元素'string'.. 遇到名称为'Fault'、命名空间'http://www.w3.org/2003/05/soap-envelope'的'Element'。" Source="System.Runtime.Serialization" 堆栈跟踪: 在 System.Runtime.Serialization.DataContractSerializer.InternalReadObject(XmlReaderDelegator xmlReader，Boolean verifyObjectName) 在 System.Runtime.Serialization.XmlObjectSerializer.ReadObjectHandleExceptions(XmlReaderDelegator 读取器，Boolean verifyObjectName) 在 System.Runtime.Serialization.XmlObjectSerializer.ReadObject(XmlDictionaryReader 阅读器) 在 System.ServiceModel.Channels.Message.GetBody[T](XmlObjectSerializer 序列化程序) 在 System.ServiceModel.Channels.Message.GetBodyT 在 ClientTestService.Program.Main(String[] args) 在 E:\Projekti\WCF\Parus\ClientTestService\ClientTestService\Program.cs:line 22 在 System.AppDomain._nExecuteAssembly(Assembly 程序集，String[] args) 在 System.AppDomain.ExecuteAssembly(字符串 assemblyFile，证据 assemblySecurity，字符串 [] args) 在 Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() 在 System.Threading.ThreadHelper.ThreadStart_Context(对象状态) 在 System.Threading.ExecutionContext.Run(ExecutionContext executionContext，ContextCallback 回调，对象状态) 在 System.Threading.ThreadHelper.ThreadStart() 内部异常:

在线:

string firstName = reply.GetBody<string>();

服务已启动，我在 VS2008 中通过“添加服务引用...”添加了服务引用。我使用 .NET Framework 3.5。

我不确定为什么会收到此错误。

当我不使用 Message 类时，一切正常。我的意思是:

[ServiceContract]
public interface ITestService
{
    [OperationContract]
    Person GetPersonById(int id);
}

public class TestService : ITestService
{
    public Person GetPersonById(int id)
    {
        Person person = Employees.CreateEmployees().First(e => e.Id == id);
        return person;
    }
}

2) 客户端代码:

static void Main(string[] args)
{
    TestServiceClient client = new TestServiceClient();
    int value = 1;
    Person person = client.GetPersonById(value);

    Console.WriteLine(person.FirstName);
    client.Close();
}

如果有人能提供帮助，我将不胜感激。

Answer 1

Message reply = client.GetPersonById(request); 
if(reply.IsFault)
  throw new GoransException(reply.toString());
string firstName = reply.GetBody<string>();
//...