根据桌面调整窗体大小和背景图片

private void Form1_Load(object sender, EventArgs e)
{
int DeskWidth = Screen.PrimaryScreen.WorkingArea.Width;
int DeskHight = Screen.PrimaryScreen.WorkingArea.Height;
this.Width = Convert.ToInt32(DeskWidth * 0.8);
this.Height = Convert.ToInt32(DeskHight * 0.8);
}

private void Form1_Load(object sender, EventArgs e)
{

this.BackgroundImage = Image.FromFile("1.jpg");
this.BackgroundImageLayout = ImageLayout.Stretch;
}