C# WinForm BorderStyle.None Resize

C# 테두리 없는 상태에서 리사이즈 하기 

const int WM_NCHITTEST = 0x0084;

const int HTCLIENT = 1;

const int HTCAPTION = 2;

protected override void WndProc(ref Message m)

{

base.WndProc(ref m);

switch (m.Msg)

{

case WM_NCHITTEST:

if (m.Result == (IntPtr)HTCLIENT)

{

m.Result = (IntPtr)HTCAPTION;

}

break;

}

}

protected override CreateParams CreateParams

{

get

{

CreateParams cp = base.CreateParams;

cp.Style |= 0x40000;

return cp;

}

}