android - WCF 对象数组参数的 JSON 请求

Question

我在网上搜索了 2 天的答案后才问这个问题。

好的，事情是这样的:

在服务器端我有一个 WCF 网络服务，定义如下:

namespace HelloRest
{
[System.ServiceModel.ServiceContract]
public interface IHelloRest
  {
    [OperationContract]
    [WebInvoke(
        Method = "POST",
        UriTemplate = "SaveVehicle",
        BodyStyle = WebMessageBodyStyle.WrappedRequest,
        ResponseFormat = WebMessageFormat.Json,
        RequestFormat = WebMessageFormat.Json)]
    string SaveVehicle(clVehicles vehicles);
  }
}

namespace HelloRest
{
  public class HelloRestService : IHelloRest
{
   public string SaveVehicle(clVehicles vehicles)
    {
    ...
    }
}
}


namespace WebApplication1
{

    [Serializable]
    [DataContract]
    public class clVehicles
    {
        [DataMember]
        public List<Vehicle> Vehicles { get; set; }
    }
}


namespace WebApplication1
{

    [Serializable]
    [DataContract]
    public class Vehicle
    {

        [DataMember(Name = "year")]
        public int Year
        {
            get;
            set;
        }

        [DataMember(Name = "plate")]
        public string Plate
        {
            get;
            set;
        }

        [DataMember(Name = "make")]
        public string Make
        {
            get;
            set;
        }

        [DataMember(Name = "model")]
        public string Model
        {
            get;
            set;
        }
    }    
}

我正在尝试通过 Android 以这种方式使用此 Web 服务:

HttpPost request = new HttpPost(Consts.URL + "/SaveVehicle");
request.setHeader("Accept", "application/json");
request.setHeader("Content-type", "application/json");

JSONStringer v = new JSONStringer();
v.object();
v.key("Vehicles");
v.object();
v.key("plate").value(plate);
v.key("make").value(make);
v.key("model").value(model);
v.key("year").value(Integer.parseInt(year.toString()));
v.endObject();
v.endObject();
JSONArray arr = new JSONArray();
arr.put(v);

JSONStringer vehicle = new JSONStringer();
vehicle.object();
vehicle.key("vehicles").value(arr);
vehicle.endObject();

StringEntity entity = new StringEntity(vehicle.toString());
request.setEntity(entity);
// Send request to WCF service
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpResponse response = httpClient.execute(request);

问题:

当我启动客户端时，请求被正确转发到服务器(我在“SaveVehicle”函数中有一个断点)。

问题在于函数的参数:“vehicles”——这个对象(假设)只包含一个成员——“Vehicles”，类型为:List。无论我从客户端发送什么，我都会得到这个内部容器(“Vehicles”)的空值。

我几乎什么都试过了!我确定问题出在 JSONStringer 区域的某处......

Answer 1

找到答案:定义你的类如下:

namespace WebApplication1
{
 [KnownType(typeof(Vehicle))]
 [DataContract]
 public class Vehicle
 {
 }
}


namespace WebApplication1
{
 [CollectionDataContract]
 [KnownType(typeof(Vehicle))]
 public class clVehicles: List<Vehicle>
 {      
 }
}