返回LINQ到实体查询结果作为JSON字符串

Question

我试图构建一个Web服务，允许RESTful请求返回LINQ to Entities数据作为JSON字符串数据。我必须在执行调用返回一个特定对象的数据库没有问题：

public Product GetTicket(string s) 
     { 
      int id = Convert.ToInt32(s); 


MWAEntities context = new MWAEntities(); 
     var ticketEntity = (from p 
          in context.HD_TicketCurrentStatus 
          where p.Ticket_ID == id 
          select p).FirstOrDefault(); 
     if (ticketEntity != null) 
      return TranslateTicketEntityToTicket(ticketEntity); 
     else 
      throw new Exception("Invalid Ticket ID"); 

     /** 
     Product product = new Product(); 
     product.TicketId = 1; 
     product.TicketDescription = "MyTest"; 
     product.TicketOperator = "Chad Cross"; 
     product.TicketStatus = "Work in Progress"; 
     return product; 
     */ 
    } 
    private Product TranslateTicketEntityToTicket(
     HD_TicketCurrentStatus ticketEntity) 
    { 
     Product ticket = new Product(); 
     ticket.TicketId = ticketEntity.Ticket_ID; 
     ticket.TicketDescription = ticketEntity.F_PrivateMessage; 
     ticket.TicketStatus = ticketEntity.L_Status; 
     ticket.TicketOperator = ticketEntity.L_Technician; 
     return ticket; 
    } 

使用curl，我得到的JSON数据：

curl http://192.168.210.129:1111/ProductService/ticket/2 
{"TicketDescription":"Firewall seems to be blocking her connection to www.rskco.com","TicketId":2,"TicketOperator":"Jeff","TicketStatus":"Completed"} 

话虽这么说，我不知道怎么去使用下面的查询JSON对象的字符串：

public List<MyTicket> GetMyTickets(string userId) 
    { 
     MWAEntities context = new MWAEntities(); 

     /** 
     * List of statuses that I consider to be "open" 
     * */ 
     string[] statusOpen = new string[] { "Work in Progress", "Assigned", "Unassigned" }; 

     /** 
     * List of tickets with my userID 
     * */ 
     var tickets = (from p 
         in context.HD_TicketCurrentStatus 
         where statusOpen.Contains(p.L_Status) & p.L_Technician == userId 
         select new MyTicket(p.Ticket_ID, p.Ticket_CrtdUser, p.F_PrivateMessage, p.Ticket_CrtdDate, p.L_Status)); 

     return ???; 
    } 

MyTicket是定义为一个类型如下：

[DataContract] 
public class MyTicket 
{ 
    public MyTicket(int ticketId, string TicketCreator, string FirstPrivateMessage, DateTime TicketCreatedDate, string Status) 
    { 
     this.TicketId = ticketId; 
     this.TicketCreator = TicketCreator; 
     this.FirstPrivateMessage = FirstPrivateMessage; 
     this.TicketCreatedDate = TicketCreatedDate; 
     this.Status = Status; 
    } 
    [DataMember] 
    public int TicketId { get; set; }  

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

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

    [DataMember] 
    public DateTime TicketCreatedDate { get; set; } 

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

    //p.Ticket_CrtdUser, p.Ticket_CrtdDate, p.Ticket_ID, p.F_PrivateMessage 
} 

我只想得到一个JSON字符串列表作为输出为了解析使用JS。我尝试使用foreach循环来解析“var”到MyTicket对象列表中，调用.ToList（））等，无济于事。

我无法更改后端（SQL 2005/2008），但我试图使用标准的HTML/JS客户端来使用.NET 4.0 Web服务。任何帮助将不胜感激。我从字面上花了几天的搜索和读书（尤其是O'Reilly的Safari浏览器的网站），我还没有找到一个合理的解决办法:(

Answer 1

我想编辑补充说，我最终得到了解决这个问题的帮助。即使我正在使用实体框架，我也没有使用商业实体。这可能不是一个明智的决定，但我越来越与Linq2SQL和Linq2EF混淆。下面是该作上述工作的代码：

public List<MyTicket> GetMyTickets(string userId) 
    { 
     MWAEntities context = new MWAEntities(); 

     /** 
     * List of statuses that I consider to be "open" 
     * */ 
     string[] statusOpen = new string[] { "Work in Progress", "Created"}; 

     var tickets = (from p 
         in context.HD_TicketCurrentStatus 
         where statusOpen.Contains(p.L_Status) & p.L_Technician == userId 
         select new MyTicket{ 
          TicketId = p.Ticket_ID, 
          TicketCreatedDate = p.Ticket_CrtdDate, 
          FirstPrivateMessage = p.F_PrivateMessage, 
          Status = p.L_Status, 
          TicketCreator = p.Ticket_CrtdUser 
         }); 
     return tickets.ToList(); 
    } 

Answer 2

使用Json.NET：http://james.newtonking.com/pages/json-net.aspx

using Newtonsoft.Json; 

var serializer = new JsonSerializer(); 
serializer.Serialize(Response.Output, tickets); // per your example 

编辑：哎呀，上面的是，如果你想自己处理序列。

在你的榜样，改变方法，从清单票[]返回并做

return tickets.ToArray();