怎么用C#创建一个中空的窗体

Question

c#自定义窗体

Answer 1

http://www.cnblogs.com/jxsoft/archive/2011/03/09/1978153.html

Answer 2

给窗体设置一个背景色，然后设置窗体TransparencyKey属性和背景色一个颜色，然后窗体就是透明的了

Answer 3

http://www.cnblogs.com/alexis/archive/2010/08/29/1811826.html

Answer 4

http://www.cnblogs.com/alexis/archive/2010/08/29/1811826.html 

Answer 5

public partial class Form1 : Form
{
    const int SC_MOVE = 0xF010;
    const int HTCAPTION = 0x0002;
    const int WM_SYSCOMMAND = 0x0112;
    [DllImport("user32.dll")]
    public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);
    [DllImport("user32.dll")]
    public static extern bool ReleaseCapture();    Bitmap bgImage;
    public Form1()
    {
        InitializeComponent();        bgImage = Properties.Resources.pic;        FormBorderStyle = FormBorderStyle.None;
        BackColor = Color.White;
        TransparencyKey = Color.White;
        Paint += new PaintEventHandler(Form1_Paint);
        MouseDown += new MouseEventHandler(Form1_MouseDown);
    }    void Form1_MouseDown(object sender, MouseEventArgs e)
    {
        ReleaseCapture();
        SendMessage(Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);
    }    void Form1_Paint(object sender, PaintEventArgs e)
    {
        e.Graphics.DrawImage(bgImage, 0, 0, bgImage.Width, bgImage.Height);
    }
}