C#序列化JSON

public static string ConvertToJsonString<T>(T instance)

{             using (MemoryStream stream = new MemoryStream())

　　　　    {

　　　　　　DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(T));

serializer.WriteObject(stream, instance);

StringBuilder sb = new StringBuilder();

sb.Append(Encoding.UTF8.GetString(stream.ToArray(), 0, stream.ToArray().Length));

return sb.ToString();

}

}