请问一下有谁知道把model怎么序列化成JSON格式的string啊？
1.
// 根据对象序列化
public static string Serialize<T>(object obj)
{
//预定义
string result = null;
//尝试序列化
try
{
DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(T));
MemoryStream stream = new MemoryStream();
serializer.WriteObject(stream, obj);
byte[] dataBytes = new byte[stream.Length];
stream.Position = 0;
stream.Read(dataBytes, 0, (int)stream.Length);
result = Encoding.UTF8.GetString(dataBytes);
}
catch
{
//失败
}
return result;
}

2.model层

namespace iTry86.Quote.Model
{

[Serializable]
public class stocksnap
{
[DataMember(Order = 0)]
///<summary>
///股票代码
///</summary>
public string Code { get;set;}

[DataMember(Order = 1)]
///<summary>
///股票名称
///</summary>
public string Name { get;set;}

[DataMember(Order = 2)]
///<summary>
///收盘价
///</summary>
public float Close { get;set;}

[DataMember(Order = 3)]
///<summary>
///开盘价
///</summary>
public float Open { get;set;}

[DataMember(Order = 4)]
///<summary>
///最高价
///</summary>
public float High { get;set;}
｝｝

3.webservice里面的方法

[WebMethod]
public string Add(string input)
{


iTry86.Quote.Model.stocksnap stock = new iTry86.Quote.Model.stocksnap();
stock.Code=values[0].Trim();
stock.Name= values[1].Trim();
stock.Close= float.Parse(values[2].Trim());
stock.Open= float.Parse(values[3].Trim());
stock.High= float.Parse(values[4].Trim());



string strjson = BingLib.DataAccess.Json.Serialize<string>(stock);//序列化成string

return strjson;
}


请问上面哪里有错误？怎么不能进行序列化？
结果应该是json格式的字符串，但是输出的结果却是
<?xml version="1.0" encoding="utf-8" ?>
<string xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xsi:nil="true" xmlns="http://www.itry86.com/" />
这是怎么回事？

[解决办法]
model的 [Serializable] 上面添加
[DataContract(Namespace = "http://www.itry86.com")]

//将对象转化成Json字符串

DataContractJsonSerializer ds = new DataContractJsonSerializer(typeof(iTry86.Quote.Model.SH_Ticks));
string strjson = string.Empty;
using (MemoryStream ms = new MemoryStream())
{

ds.WriteObject(ms, ticks);

strjson = System.Text.Encoding.UTF8.GetString(ms.ToArray());

}