1  static void Main(string[] args)
 2         {
 3             Models m = new Models() { a = "1", b = "2" };
 4             string json=JsonSerializer<Models>(m);
 5             Console.WriteLine(json);
 6             //輸出結果：b在a前邊
 7             //{"b":"2","a":"1"}
 8         }
 9         //
 
自定義類
10         [DataContract]
11         public class Models
12         {
13             //Order索引從0開始，越小越靠前
14             [DataMember(Order = 2)]
15             public string a { get; set; }
16             [DataMember(Order = 1)]
17             public string b { get; set; }
18 
19         }
 
20         //JSON序列化
21         public static string JsonSerializer<T>(T t)
22         {
23             DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T));
24             MemoryStream ms = new MemoryStream();
25             ser.WriteObject(ms, t);
26             string
 
 jsonString = Encoding.UTF8.GetString(ms.ToArray());
27             ms.Close();
28             return jsonString;
29         }
30         /// <summary>
31         /// JSON反序列化
32         /// </summary>
33         public static T JsonDeserialize<T>(string jsonString)
34         {
35             DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T));
36             MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonString));
37             T obj = (T)ser.ReadObject(ms);
38             return obj;
39         }

C#/.net/WCF 使用DataMember Order 無視屬性自上而下的輸出順序，自定義Json輸出排序，該方法大神也不一定會！