C#基本语法

基本语法

// See https://aka.ms/new-console-template for more information
// Hello World
Console.WriteLine("Hello, World!");
// declare variable
int x = 0;
// expression
x = x + 1;
x = 0;
// function calling
logStringNTimes(x.ToString(), x);


// function defining
void logStringNTimes(string str, int times)
{
    // choice structure
    if (times <= 0)
    {
        return;
    }
    switch (times)
    {
        case <= 0:
            return;
        default:
            break;
    }
    // sequential structure
    times++;
    // looping structure
    for (int i = 0; i < times; i++)
    {
        Console.WriteLine(str);
    }
    int times_tmp = times;
    while (times_tmp > 0)
    {
        Console.WriteLine(times_tmp--);
    }
}


// instantiate a class 
Parent parent = new Parent;
parent.Name = "dad";
parent.Age = 18; // actual 19 (calling property setter)

 Parent Class defination

// object orientation
class Parent
{
    // field
    private string name;

    // property 
    public string Name { get => name; set => name = value; }
    public int Age 
    { 
        get => {
            ++age;
        }
        set => {
            age = ++value;
        }
    }

    private int age;

    // method
    public string selfIntro()
    {
        return $"name: {name}; age: {age}";
    }

    // class method 
    public static string theClassName() 
    {
        return typeof(Parent).Name;
    }
}