C#全屏隨機位置顯示圖片的小程式

想法：將屏幕截圖作為程式背景圖，在之上彈出提示視窗，選擇確定後進行定時圖片隨機位置顯示。（支持ESC鍵退出）

• 需要添加的控制項：Timer

• 需要修改的Form1屬性為下圖紅色區域：

• 資源文件的添加：添加->新建項->資源文件

• ESC鍵退出程式：

在Form1.Designer.cs中增加

this.KeyDown += Form1_KeyDown;

• 代碼如下：

   1         Rectangle bounds = Screen.GetBounds(Screen.GetBounds(Point.Empty));
   2 
   3         public Form1()
   4         {
   5             this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
   6             this.BackgroundImage = GetNoCursor();
   7             InitializeComponent();
   8         }
   9 
  10         private void Form1_Load(object sender, EventArgs e)
  11         {
  12             timer1.Interval = 500;
  13             if (MessageBox.Show("消息", "標題", MessageBoxButtons.YesNo) == DialogResult.Yes)
  14             {
  15                 timer1.Enabled = true;
  16             }
  17             else
  18             {
  19                 this.Close();
  20             }
  21         }
  22 
  23         private void Form1_KeyDown(object sender, KeyEventArgs e)
  24         {
  25             if (e.KeyData == Keys.Escape)
  26             {
  27                 timer1.Enabled = false;
  28                 MessageBox.Show("消息", "標題", MessageBoxButtons.OK);
  29                 this.Close();
  30             }
  31         }
  32 
  33         private Bitmap GetNoCursor()
  34         {
  35             Bitmap Source = new Bitmap(bounds.Width, bounds.Height);    //根據屏幕大小創建Bitmap對象
  36             Graphics g = Graphics.FromImage(Source);
  37             g.CopyFromScreen(0, 0, 0, 0, Source.Size);  //獲取沒有滑鼠的屏幕截圖
  38             g.Dispose();    //釋放資源
  39             return Source;
  40         }
  41 
  42         private void timer1_Tick(object sender, EventArgs e)
  43         {
  44             Image img = Resource1.Image1;//獲取用於顯示的資源文件
  45             if (img != null)
  46             {
  47                 Graphics g = this.CreateGraphics();
  48                 Random rd = new Random();
  49                 int picXPoint = rd.Next(0, bounds.Right - img.Width);
  50                 int picYPoint = rd.Next(0, bounds.Height - img.Height);
  51                 Point ulCorner = new Point(picXPoint, picYPoint);
  52                 g.DrawImageUnscaled(img, ulCorner);
  53             }
  54             else
  55             {
  56                 timer1.Enabled = false;
  57                 MessageBox.Show("沒有圖片，感謝使用");
  58                 this.Close();
  59             }
  60         }