//使用DateTime的Now靜態(tài)屬性動態(tài)獲取系統(tǒng)時間
namespace _053
{
    public partial class Form1 : Form
    {
 
        public Form1()
        {
            InitializeComponent();
            Load += Form1_Load;
        }
        private void Form1_Load(object? sender, EventArgs e)
        {
            SuspendLayout();
            // 
            // Form1
            // 
            AutoScaleDimensions = new SizeF(7F, 17F);
            AutoScaleMode = AutoScaleMode.Font;
            ClientSize = new Size(394, 41);
            Name = "Form1";
            StartPosition = FormStartPosition.CenterScreen;
            Text = "動態(tài)獲取系統(tǒng)時間";         
            ResumeLayout(false);
 
            Thread thread = new(//創(chuàng)建線程
                () =>                   //使用lambda表達式
                {
                    while (true)        //無限循環(huán)
                    {
                        Invoke(         //操作窗體線程
                              (MethodInvoker)delegate ()//使用匿名方法
                              {
                                  Refresh();//刷新窗體
                                  Graphics graphics = CreateGraphics(); //創(chuàng)建繪圖對象
                                  graphics.DrawString("系統(tǒng)時間：" +     //在窗體中繪出系統(tǒng)時間
                                      DateTime.Now.ToString("yyyy年MM月dd日 HH時mm分ss秒"),
                                      new Font("Times New Roman", 14),
                                      Brushes.Blue,
                                      new Point(10, 10));
                              });
                        Thread.Sleep(1000);//線程掛起1秒鐘
                    }
                })
                {
                    IsBackground = true   //將線程設置為后臺線程
                };
            thread.Start();               //線程開始執(zhí)行
        }
    }
}

public Thread (System.Threading.ThreadStart start);