在windform中，怎么设置无边框窗体自动上卷?

Question

因为窗体设置了成了无边框,  即是将窗体的属性FormBorderStyle设置成了None，现在我是想当鼠标拖动窗体的时候，当拖动到屏幕上方边缘的时候，鼠标走开，窗体会缩上去，也就是隐藏了，就是 达到QQ的那种效果，请问大虾们应该如何实现这个功能? 最好能给出完整的代码。

Answer 1

http://www.cnblogs.com/xiaowei0705/archive/2011/06/24/2089169.html

Answer 2

这是刚才改的一段代码，有什么不明白的问我。
public partial class Form1 : Form
    {
        private AnchorStyles anchor = AnchorStyles.None;
        
        public Form1()
        {
            InitializeComponent();
        }        private void Form1_Load(object sender, EventArgs e)
        {
            timer1.Interval = 50;
            timer1.Enabled = true;
            TopMost = true;
            timer1.Start();
        }        private void mStopAnhor()
        {
            if (Top <= 0 && Left <= 0)
            {
                anchor = AnchorStyles.None;
            }
            else if (Top <= 0)
            {
                anchor = AnchorStyles.Top;
            }
            else if (Left <= 0)
            {
                anchor = AnchorStyles.Left;
            }
            else if (Left >= Screen.PrimaryScreen.Bounds.Width - Width)
            {
                anchor = AnchorStyles.Right;
            }
            else if (Top >= Screen.PrimaryScreen.Bounds.Height - Height)
            {
                anchor = AnchorStyles.Bottom;
            }
            else
            {
                anchor = AnchorStyles.None;
            }
        }        private void Form1_LocationChanged(object sender, EventArgs e)
        {
            mStopAnhor();
        }        private void timer1_Tick(object sender, EventArgs e)
        {
            if (Bounds.Contains(Cursor.Position))
            {
                switch (anchor)
                {
                    case AnchorStyles.Top:
                        Location = new Point(Location.X, 0);
                        break;
                    case AnchorStyles.Left:
                        Location = new Point(0, Location.Y);
                        break;
                    case AnchorStyles.Right:
                        Location = new Point(Screen.PrimaryScreen.Bounds.Width - Width, Location.Y);
                        break;
                    case AnchorStyles.Bottom:
                        Location = new Point(Location.X, Screen.PrimaryScreen.Bounds.Height - Height);
                        break;
                    default:
                        break;
                }
            }
            else
            {
                switch (anchor)
                {
                    case AnchorStyles.Top:
                        Location = new Point(Location.X, (Height - 8) * (-1));
                        break;
                    case AnchorStyles.Left:
                        Location = new Point((-1) * (Width - 8), Location.Y);
                        break;
                    case AnchorStyles.Right:
                        Location = new Point(Screen.PrimaryScreen.Bounds.Width - 8, Location.Y);
                        break;
                    case AnchorStyles.Bottom:
                        Location = new Point(Location.X, (Screen.PrimaryScreen.Bounds.Height - 8));
                        break;
                    default:
                        break;
                }
            }
        }
    }

Answer 3

[Quote=引用 5 楼 llftc 的回复:]这是刚才改的一段代码，有什么不明白的问我。大神，谢啦。问题解决了，太犀利了，大神，能够留下你的QQ吗? 以后有不懂的可以请教你了。