重载“最小化”的实现方法

const int WM_SYSCOMMAND = 0x112; 
const int SC_CLOSE = 0xF060; 
const int SC_MINIMIZE = 0xF020; 
const int SC_MAXIMIZE = 0xF030; 

protected override void WndProc(ref Message m) 
{ 
    if (m.Msg == WM_SYSCOMMAND) 
    { 
        if (m.WParam.ToInt32() == SC_MINIMIZE) 
        { 
            this.Visible = false; 
            return; 
        } 
    } 
    base.WndProc(ref m); 
}