A brief introduction to C#.NET, JavaScript and JSON (graphics and text)

This article introduces C#.NET, JavaScript and # The relevant knowledge of ##JSON has a very good reference value. Let’s take a look at it with the editor.

Written in front

All typed by hand, If there is no unnecessary information, I will record all the basic information.

1. What is JSON

JSON: JavaScript

Object Notation is a lightweight data interaction format, mainly used for data transmission

2. JSON syntax rules

1. Data consists of key-value pairs ( Mapping) relationship representation, use ":" to represent;

Example: "name" : "Zhao Da".

2. Use "," to separate the data;

Example: "name" : "Zhao Da", "age" : "27".

3. The data mapping collection (object) is included with "{}";

Example: A student data object:

　{"id" : "1", "name" : "Zhao Da", "age" : "27", "gender" : "Male"}

4. The collection of parallel data (array form of objects) is included with "[]" and separated by ",";

Example: two student data object arrays:

　[ {"id" : "1", "name" : "Zhao Da", "age" : "27", "gender" : "Male"}, {"id" : "2", "name" : "Qian 2", "age" : "27", "gender" : "Male"}]

3. Data type in JSON data

• Number (integer or floating point number)

• String (in double quotes)

• Boolean value ( True or False)

• Array (in [])

• Object (in {})

• NULL

4. Data representation of JSON format data

It can be seen from the syntax rules of JSON that JSON data generally has the following Expression forms:

1. Single object;

2. Object collection (array);

3. Combination of 1 and 2: nesting;

　4. Pure string; And deserialization supported components, there are also third-party components,

.NET supports the JavaScriptSerializer class and DataContractJsonSerializer class,

Third-party support includes Json.net (newtonsoft.json) wait.

1. Use the JavaScriptSerializer class to serialize and deserialize JSON data:

First, you must quote it in the reference: System.Web. Extentions.dll

Reference in class file: using System.Web.Script.Serialization;

Dictionary<string, string> stu = new Dictionary<string, string>();
      stu.Add("id", "1");
      stu.Add("name", "赵大");
      stu.Add("age", "27");
      stu.Add("gender", "男");
      JavaScriptSerializer js = new JavaScriptSerializer();
      string stuJson = js.Serialize(stu);
      Console.WriteLine("使用 JavaScriptSerializer 类序列化得到JSON格式数据：");
      Console.WriteLine(stuJson);

示例：JSON单对象序列化

string deJson = stuJson;
      Dictionary<string, string> deStu = js.Deserialize<Dictionary<string, string>>(deJson);
      Console.WriteLine("使用 JavaScriptSerializer 类将JSON格式数据反序列化指定类：");
      foreach (string s in stu.Keys)
      {
        Console.WriteLine(s.ToString() + "=" + stu[s].ToString());
      }
      Console.ReadLine();

示例：JSON单对象反序列化

Run result:

##2. Use third-party supported Json.net (newtonsoft.json)

Class library

Serialize and deserialize JSON data:

6. JavaScript and JSON

1. Customize the JSON string in JavaScript and parse it;

Example: Student Zhao Da information:

function myJson() {
      var stu = { "id": "1", "name": "赵大", "age": "27", "gender": "男", "school": { "class": "03", "teacher": "赵大的老师" } };
      alert("id=" + stu.id + ", " + "name=" + stu.name + ", " + "age=" + stu.age + ", " + "gender=" + stu.gender);
    }

Rendering:

After you can see the custom JSON string, you can automatically use the stu object Recognized as member variable

.

2. The JSON data passed in from the background is parsed and converted into a JSON data object:

Example: Student Zhao Da information (here The Ajax request was processed with JQuery):

$(document).ready(function () {
      $.ajax({
        url: "AjaxWeb.ashx",
        type: "GET",
        dataType: "JSON",
        success: function (data) {
          var stu = JSON.parse(data);
          alert("id=" + stu.id + ", " + "name=" + stu.name + ", " + "age=" + stu.age + ",
           " + "gender=" + stu.gender + ", " + "teacher=" + stu.school["teacher"]);
        },
        error: function (e) {
          alert(e.toString());
        }
      })
    })

从后台获取JSON字符串后转化为JSON对象

public void ProcessRequest(HttpContext context)
    {
      context.Response.Write(myJson2());
    }
    private string myJson2()
    {
      string json = " {\"id\": \"1\", \"name\": \"赵大\", \"age\": \"27\", \"gender\": \"男\", \"school\": 
      { \"class\": \"03\", \"teacher\": \"赵大的老师\" }}";
      JavaScriptSerializer js = new JavaScriptSerializer();
      json = js.Serialize(json);
      return json;
    }

后台处理文件代码

Rendering:

F12 developer tool debugging renderings under Chrome:

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