给MDI 父窗体添加背景和解决闪烁的问题。

 

 1         public frmMain()
 2         {
 3             InitializeComponent();
 4             foreach (Control var in this.Controls)
 5             {
 6                 if (var is MdiClient)
 7                 {
 8                     mdiClient = var as MdiClient;
 9                     break;
10                 }
11             }
12 
13             if (mdiClient != null)
14             {
15                 mdiClient.Paint += new PaintEventHandler(OnMdiClientPaint);
16                 System.Reflection.MethodInfo mi = (mdiClient as Control).GetType().GetMethod("SetStyle", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
17                 mi.Invoke(mdiClient, new object[] { ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint | ControlStyles.OptimizedDoubleBuffer
18                 | ControlStyles.ResizeRedraw, true });
19 
20             }
21         }
22 
23         private void OnMdiClientPaint(object sender, PaintEventArgs e)
24         {
25             Graphics g = e.Graphics;
26             g.DrawImage(Properties.Resources.BackgroundImage, new Rectangle(0, 0, mdiClient.Width, mdiClient.Height));
27             string msg = "wuChang@guet.edu.cn";
28             SizeF size = e.Graphics.MeasureString(msg, this.Font);
29             g.DrawString(msg, this.Font, new SolidBrush(Color.White), mdiClient.Width - size.Width, mdiClient.Height - size.Height);
30 
31         }