C #. NET, JavaScript, and JSON,

C #. NET, JavaScript, and JSON,

Preface

If there is no surplus, we will record all the items we use.

1. What is JSON

JSON: JavaScript Object Notation, a lightweight data interaction format, is mainly used for data transmission.

Ii. JSON syntax rules

1. Data is represented by key-value pairs (ing), and is represented;

Example: "name": "Zhao da ".

2. Separate data with commas;

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

3. The set (object) of data ing is included in;

Example: A student data object:

{"Id": "1", "name": "Zhao da", "age": "27", "gender": "male "}

4. The set of parallel data (in the form of an array of objects) is included in "[]" and separated;

Example: an array of two student data objects:

[{"Id": "1", "name": "Zhao da", "age": "27", "gender": "male" },{ "id ": "2", "name": "Qian 'er", "age": "27", "gender": "male"}]

Iii. Data Types in JSON data

• Number (integer or floating point number)
• String (in double quotation marks)
• Boolean (True or False)
• Array (in)
• Object (in)
• NULL

Iv. Data presentation in JSON format

　　According to the JSON syntax rules, JSON data generally has the following forms:

1. single object;

2. object set (array );

3. Combinations of 1 and 2: nesting;

4. Pure string;

V. C #. NET and JSON

　　In the C #. NET environment, there are components that support JSON serialization and deserialization, as well as third-party components,

. NET supports the JavaScriptSerializer class and DataContractJsonSerializer class,

Third parties support Json.net (newtonsoft. json) and so on.

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

First, you must reference System. Web. Extentions. dll in reference.

Class file reference: using System. Web. Script. Serialization;

　　

1 Dictionary <string, string> stu = new Dictionary <string, string> (); 2 stu. add ("id", "1"); 3 stu. add ("name", "Zhao da"); 4 stu. add ("age", "27"); 5 stu. add ("gender", "male"); 6 7 JavaScriptSerializer js = new JavaScriptSerializer (); 8 string stuJson = js. serialize (stu); 9 Console. writeLine ("Use the JavaScriptSerializer class to serialize data in JSON format:"); 10 Console. writeLine (stuJson );

Example: JSON Single Object serialization

1 string deJson = stuJson; 2 Dictionary <string, string> deStu = js. deserialize <Dictionary <string, string> (deJson); 3 Console. writeLine ("deserialization of JSON format data using the JavaScriptSerializer class specified class:"); 4 foreach (string s in stu. keys) 5 {6 Console. writeLine (s. toString () + "=" + stu [s]. toString (); 7} 8 Console. readLine ();

Example: JSON single object deserialization

Running result:

　　

　　2. Use the third-party Json.net (newtonsoft. json) class library to serialize and deserialize JSON data:

Reference: http://www.newtonsoft.com/json

Vi. JavaScript and JSON

　　1. Customize and parse JSON strings in JavaScript;

Example: Student Zhao da information:

　　　　

Function myJson () {var stu = {"id": "1", "name": "Zhao da", "age": "27", "gender ": "male", "school": {"class": "03", "teacher": "Zhao's teacher" }}; alert ("id =" + stu. id + "," + "name =" + stu. name + "," + "age =" + stu. age + "," + "gender =" + stu. gender );}

Custom JSON string

:

　　　　

After the custom JSON string is displayed, the stu object can be automatically recognized as a member variable.

　　2. JSON data imported from the background is parsed and converted to a JSON data object:

Example: Student Zhao da information (Ajax requests are processed using JQuery ):

　　　　

 1         $(document).ready(function () { 2             $.ajax({ 3                 url: "AjaxWeb.ashx", 4                 type: "GET", 5                 dataType: "JSON", 6                 success: function (data) { 7                     var stu = JSON.parse(data); 8                     alert("id=" + stu.id + ", " + "name=" + stu.name + ", " + "age=" + stu.age + ", " + "gender=" + stu.gender + ", " + "teacher=" + stu.school["teacher"]); 9                 },10                 error: function (e) {11                     alert(e.toString());12                 }13             })14         })

Obtain the JSON string from the background and convert it to a JSON object.

1 public void ProcessRequest (HttpContext context) 2 {3 context. response. write (myJson2 (); 4} 5 6 private string myJson2 () 7 {8 string json = "{\" id \ ": \" 1 \", \ "name \": \ "Zhao da \", \ "age \": \ "27 \", \ "gender \": \ "male \", \ "school \": {\ "class \": \ "03 \", \ "teacher \": \ "Zhao DA's teacher \"}}"; 9. JavaScriptSerializer js = new JavaScriptSerializer (); 10 json = js. serialize (json); 11 return json; 12}

Background File Processing code

:

　　

Debugging of F12 Developer Tools in Chrome:

　　

VII. References

• Baidu encyclopedia
• Baidu search
• MOOC (http://www.imooc.com /)
• JSON online verification and formatting (http://jsonlint.com /)