Json.NET - 一套ASP.NET與JSON Format的轉換套件

Json.Net: 官方說是給.NET使用高效能的Json Framework.

官方網站: http://json.codeplex.com/

文件: http://james.newtonking.com/projects/json/help/

主要功能:

1. Dynamic to JSON format: 利用.NET 4.0 dynamic動態定義與JSON之間轉換.
2. Class to JSON format: 將Class與JSON之間自動進行轉換.
3. LINQ to JSON format: 不需事先定義class即可,直接建立、讀取或修改JSON資料.

Dynamic to JSON format:

dynamic product = new JObject();

product.ProductName = "Elbow Grease";

product.Enabled = true;

product.Price = 4.90m;

product.StockCount = 9000;

product.StockValue = 44100; 

// All Elbow Grease must go sale!

// 50% off price 

product.Price = product.Price / 2;

product.StockValue = product.StockCount * product.Price;

product.ProductName = product.ProductName + " (SALE)"; 

string json = product.ToString();

// {

//   "ProductName": "Elbow Grease (SALE)",

//   "Enabled": true,

//   "Price": 2.45,

//   "StockCount": 9000,

//   "StockValue": 22050.0

// }

Class to JSON format:

public class Message

{

    public string Address { get; set; } 

    [JsonProperty(TypeNameHandling = TypeNameHandling.All)]

    public object Body { get; set; }

} 

public class SearchDetails

{

    public string Query { get; set; }

    public string Language { get; set; }

}

Message message = new Message();

message.Address = "http://www.google.com";

message.Body = new SearchDetails

  {

    Query = "Json.NET",

    Language = "en-us"

  }; 

string json = JsonConvert.SerializeObject(message, Formatting.Indented);

// {

//      "Address": "http://www.google.com",

//      "Body": {

//          "$type": "Newtonsoft.Json.Tests.Serialization.SearchDetails, Newtonsoft.Json.Tests",

//          "Query": "Json.NET",

//          "Language": "en-us"

//      }

// } 

Message deserialized = JsonConvert.DeserializeObject<Message>(json); 

SearchDetails searchDetails = (SearchDetails) deserialized.Body; 

LINQ to JSON format:

JArray array = new JArray();

JValue text = new JValue("Manual text");

JValue date = new JValue(new DateTime(2000, 5, 23)); 

array.Add(text);

array.Add(date); 

string json = array.ToString();

// [

//   "Manual text",

//   "\/Date(958996800000+1200)\/"

// ]

List<Post> posts = GetPosts(); 

JObject rss =

  new JObject(

    new JProperty("channel",

      new JObject(

        new JProperty("title", "James Newton-King"),

        new JProperty("link", "http://james.newtonking.com"),

        new JProperty("description", "James Newton-King's blog."),

        new JProperty("item",

          new JArray(

            from p in posts

            orderby p.Title

            select new JObject(

              new JProperty("title", p.Title),

              new JProperty("description", p.Description),

              new JProperty("link", p.Link),

              new JProperty("category",

                new JArray(

                  from c in p.Categories

                  select new JValue(c))))))))); 

Console.WriteLine(rss.ToString()); 

//{

//  "channel": {

//    "title": "James Newton-King",

//    "link": "http://james.newtonking.com",

//    "description": "James Newton-King's blog.",

//    "item": [

//      {

//        "title": "Json.NET 1.3 + New license + Now on CodePlex",

//        "description": "Annoucing the release of Json.NET 1.3, the MIT license and the source being available on CodePlex",

//        "link": "http://james.newtonking.com/projects/json-net.aspx",

//        "category": [

//          "Json.NET",

//          "CodePlex"

//        ]

//      },

//      {

//        "title": "LINQ to JSON beta",

//        "description": "Annoucing LINQ to JSON",

//        "link": "http://james.newtonking.com/projects/json-net.aspx",

//        "category": [

//          "Json.NET",

//          "LINQ"

//        ]

//      }

//    ]

//  }

//}

在ASP.NET與Javascript之間進行ajax資料傳遞的時候,JSON格式算是一個很便利的傳輸格式,且jQuery有直接取得JSON format的method,對於前端資料顯示的處理便利很多.