C#全屏随机位置显示图片的小程序

想法：将屏幕截图作为程序背景图，在之上弹出提示窗口，选择确定后进行定时图片随机位置显示。（支持ESC键退出）

• 需要添加的控件：Timer

• 需要修改的Form1属性为下图红色区域：

 

• 资源文件的添加：添加->新建项->资源文件

• ESC键退出程序：

在Form1.Designer.cs中增加

this.KeyDown += Form1_KeyDown;

• 代码如下：

          Rectangle bounds = Screen.GetBounds(Screen.GetBounds(Point.Empty));
  
          public Form1()
          {
              this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
              this.BackgroundImage = GetNoCursor();
              InitializeComponent();
          }
  
          private void Form1_Load(object sender, EventArgs e)
          {
              timer1.Interval = 500;
              if (MessageBox.Show("消息", "标题", MessageBoxButtons.YesNo) == DialogResult.Yes)
              {
                  timer1.Enabled = true;
              }
              else
              {
                  this.Close();
              }
          }
  
          private void Form1_KeyDown(object sender, KeyEventArgs e)
          {
              if (e.KeyData == Keys.Escape)
              {
                  timer1.Enabled = false;
                  MessageBox.Show("消息", "标题", MessageBoxButtons.OK);
                  this.Close();
              }
          }
  
          private Bitmap GetNoCursor()
          {
              Bitmap Source = new Bitmap(bounds.Width, bounds.Height);    //根据屏幕大小创建Bitmap对象
              Graphics g = Graphics.FromImage(Source);
              g.CopyFromScreen(0, 0, 0, 0, Source.Size);  //获取没有鼠标的屏幕截图
              g.Dispose();    //释放资源
              return Source;
          }
  
          private void timer1_Tick(object sender, EventArgs e)
          {
              Image img = Resource1.Image1;//获取用于显示的资源文件
              if (img != null)
              {
                  Graphics g = this.CreateGraphics();
                  Random rd = new Random();
                  int picXPoint = rd.Next(0, bounds.Right - img.Width);
                  int picYPoint = rd.Next(0, bounds.Height - img.Height);
                  Point ulCorner = new Point(picXPoint, picYPoint);
                  g.DrawImageUnscaled(img, ulCorner);
              }
              else
              {
                  timer1.Enabled = false;
                  MessageBox.Show("没有图片，感谢使用");
                  this.Close();
              }
          }