1.重寫wndProc代碼：

protected override void WndProc(ref Message m)
{???????
??????? const int WM_NCHITTEST = 0x84;
??????? const int HTCLIENT = 0x01;
??????? const int HTCAPTION = 0x02;
???????? if (m.Msg == WM_NCHITTEST)
??????? {
??????????????? this.DefWndProc(ref m);
??????????????? if (m.Result.ToInt32() == HTCLIENT)
??????????????????? m.Result = new IntPtr(HTCAPTION);
??????????????? else
??????????????????? base.WndProc(ref m);
??????? }
??????? else
??????? {
??????????????? base.WndProc(ref m);
??????? }
}

2.創建消息
代碼：

private const int WM_NCLBUTTONDOWN = 0x00A1;
private const int WM_NCHITTEST = 0x84;
private const int HT_CAPTION = 0x2;
private const int HT_CLIENT = 0x1;

private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
{
??? //this.Capture = false;
??? pictureBox1.Capture = false;
??? Message msg = Message.Create(Handle, WM_NCLBUTTONDOWN, (IntPtr)HT_CAPTION, IntPtr.Zero);
??? WndProc(ref?? msg);???
}

3.調用API代碼：

using System.Runtime.InteropServices;

[DllImport("user32.dll")]
?public static extern bool ReleaseCapture();
[DllImport("user32.dll")]
public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);
?? public const int WM_SYSCOMMAND = 0x0112;
?? public const int SC_MOVE = 0xF010;
public const int HTCAPTION = 0x0002;

?? //在窗體的_MouseDown中加入如下代碼:
如:
private void Form1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
ReleaseCapture();
SendMessage(this.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);
}

轉載于:https://www.cnblogs.com/fornet/archive/2013/02/22/2976170.html

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