Timer类

Timer类可以按照规定时间间隔重复生成事件

构造函数有两个

参数为重复生成事件的时间间隔

public Timer();
public Timer(double interval)

示例：

class Program
{
    static int count1 = 0;
    static string displayString = 
        "This String will appear one letter at time.";
    static void Main(string[] args)
    {
        Timer myTimer = new Timer(100);
        myTimer.Elapsed += new ElapsedEventHandler(WriteChar);  //Timer的内置事件
        myTimer.Start();12         ReadKey();
    }
    static void WriteChar(object source, ElapsedEventArgs e)  
        => Write(displayString[count1++ % displayString.Length]);
}