從Wcf服務連接到dbml

Question

我有與Wcf Services通信的Web應用程序和android應用程序。 我的服務之一是Chat.svc

 [ServiceContract(Namespace = "http://webchat.com")]
public interface IChat
{
    [OperationContract]
    [WebInvoke(Method = "POST",
       ResponseFormat = WebMessageFormat.Json,
       RequestFormat = WebMessageFormat.Json,
       BodyStyle = WebMessageBodyStyle.Wrapped,
       UriTemplate = "Start")]
    StartChatResult StartChat(StartChatEntity sce);
}

和Chat.svc.cs

  public StartChatResult StartChat(StartChatEntity sce)
    {
        //doing something else

        List<tblChatRoom> list = ChatManager.GetChatRoomList();

        return new StartChatResult() { IsSuccess = true, ChatRooms = list };

    }

而這個方法來自我的ChatManager類

public static List<tblChatRoom> GetChatRoomList()
    {
        SessionDBDataContext db = new SessionDBDataContext();
        return db.tblChatRooms.ToList();
    }

當我從Android端調用StartChat方法時，始終會出現“錯誤請求”響應。 當我對此行發表評論時

List<tblChatRoom> list = ChatManager.GetChatRoomList();

我有“確定”，沒問題。 這條線有問題。 SessionDBDataContext類也是

[global::System.Data.Linq.Mapping.DatabaseAttribute(Name="SessionDB")]
public partial class SessionDBDataContext : System.Data.Linq.DataContext
{

    private static System.Data.Linq.Mapping.MappingSource mappingSource = new AttributeMappingSource();

    public SessionDBDataContext() : 
            base(global::System.Configuration.ConfigurationManager.ConnectionStrings["SessionDBConnectionString"].ConnectionString, mappingSource)
    {
        OnCreated();
    }

    public SessionDBDataContext(string connection) : 
            base(connection, mappingSource)
    {
        OnCreated();
    }

    public SessionDBDataContext(System.Data.IDbConnection connection) : 
            base(connection, mappingSource)
    {
        OnCreated();
    }

    public SessionDBDataContext(string connection, System.Data.Linq.Mapping.MappingSource mappingSource) : 
            base(connection, mappingSource)
    {
        OnCreated();
    }

    public SessionDBDataContext(System.Data.IDbConnection connection, System.Data.Linq.Mapping.MappingSource mappingSource) : 
            base(connection, mappingSource)
    {
        OnCreated();
    }

    public System.Data.Linq.Table<tblChatRoom> tblChatRooms
    {
        get
        {
            return this.GetTable<tblChatRoom>();
        }
    }

    public System.Data.Linq.Table<tblTalker> tblTalkers
    {
        get
        {
            return this.GetTable<tblTalker>();
        }
    }

    public System.Data.Linq.Table<tblSession> tblSessions
    {
        get
        {
            return this.GetTable<tblSession>();
        }
    }

    public System.Data.Linq.Table<tblMessagePool> tblMessagePools
    {
        get
        {
            return this.GetTable<tblMessagePool>();
        }
    }
}

我認為SessionDB.dbml存在問題，但是當我使用不是服務方法的方法來擁有Chatroom列表時，就可以了。 致電服務時，我不明白怎么了。 請幫助

Answer 1

測試此代碼：創建一個諸如tblChatRoom的類，例如：

public class ChatRoom
{
    public string username;
    public string firstname;
    public string lastname;

    public ChatRoom(){}

    public ChatRoom(string username, string firstname, string lastname)
    {
         this.username = username;
         this.lastname = lastname;
         this.firstname = firstname;
    }
}

public StartChatResult StartChat(StartChatEntity sce)
{
    //doing something else

    List<ChatRoom> list =
         (from q in ChatManager.GetChatRoomList()
          select new ChatRoom(q.username, q.firstname, q.lastname)).ToList();

    return new StartChatResult() { IsSuccess = true, ChatRooms = list };

}