C ＃ basic 6-file IO and JSON

Read and write files asynchronously

Next to the previous chapter , Learn simple file reading and writing from the official website example

	public static string readData;
    public static async Task SimpleWriteAsync(string text)
    {
    
        string filePath = "simple.txt";

        await File.WriteAllTextAsync(filePath, text);
    }
    public static async Task SimpleReadAsync()
    {
    
        string filePath = "simple.txt";
        readData = await File.ReadAllTextAsync(filePath);
    }

JSON Serialization and deserialization

Need to use System.Text.Json
JsonSerializer Class

Import Json package
Using the command line
dotnet add package System.Text.Json --version 7.0.0-preview.5.22301.12
quote

using System.Text.Json;
using System.Text.Json.Serialization;

Write a player class

	class Player
    {
    
        //  Must be  public  And there are  getter  Can be  JsonSerializer  serialize 
        public string name {
     get; set; }
        public int age {
     get; set; }
        public int money {
     get; }
        public void log(string s)
        {
    
            Console.WriteLine(s + " " + this.name + " " + this.age + " " + this.money);
        }
    }

Copy the example of the official website

	static async Task Main()
    {
    
        //  serialize   Turn players into  JSON
        Player p = new Player();
        p.name = " Xiao Ming ";
        p.age = 24;
        p.log("p:");
        string data = JsonSerializer.Serialize(p);
        //  Write files asynchronously 
        await SimpleWriteAsync(data);
        Console.WriteLine(" Write data ");
        //  Asynchronous read file 
        await SimpleReadAsync();
        Console.WriteLine(" Read the data " + readData);
        //  Deserialization   Convert string to player object 
        Player p2 = JsonSerializer.Deserialize<Player>(readData);
        p2.log("p2:");
    }

Print the results

p:  Xiao Ming  24 0
 Write data 
 Read the data {"name":"\u5C0F\u660E","age":24,"money":0}
p2:  Xiao Ming  24 0