任务栏位置可能在上下左右，而无边框窗体最大化的时候却默认坐标为0,0.下面是解决办法：
#region 最大化处理
/*任务栏位置*/ [System.Runtime.InteropServices.DllImport("user32.dll")] public static extern int SystemParametersInfo(int uAction, int uParam, ref RECT re, int fuWinTni); [System.Runtime.InteropServices.DllImport("SHELL32", CallingConvention = System.Runtime.InteropServices.CallingConvention.StdCall)] public static extern uint SHAppBarMessage(int dwMessage, ref APPBARDATA pData); [System.Runtime.InteropServices.StructLayout(System.Runtime.InteropServices.LayoutKind.Sequential)] public struct APPBARDATA { public int cbSize; public IntPtr hWnd; public int uCallbackMessage; public int uEdge;//属性代表上、下、左、右 public RECT rc; public IntPtr lParam; } [System.Runtime.InteropServices.StructLayout(System.Runtime.InteropServices.LayoutKind.Sequential)] public struct RECT { public int left; public int top; public int right; public int bottom; public override string ToString() { return "{left=" + left.ToString() + ", " + "top=" + top.ToString() + ", " + "right=" + right.ToString() + ", " + "bottom=" + bottom.ToString() + "}"; } } /*窗体坐标*/ private const long WM_GETMINMAXINFO = 0x24; private struct POINTAPI { public int x; public int y; } private struct MINMAXINFO { public POINTAPI ptReserved; public POINTAPI ptMaxSize; public POINTAPI ptMaxPosition; public POINTAPI ptMinTrackSize; public POINTAPI ptMaxTrackSize; } protected override void WndProc(ref System.Windows.Forms.Message m) { base.WndProc(ref m); if (m.Msg == WM_GETMINMAXINFO) { this.MaximumSize = SystemInformation.WorkingArea.Size; MINMAXINFO mmi = (MINMAXINFO)m.GetLParam(typeof(MINMAXINFO)); mmi.ptMinTrackSize.x = this.MinimumSize.Width; mmi.ptMinTrackSize.y = this.MinimumSize.Height; if (this.MaximumSize.Width != 0 || this.MaximumSize.Height != 0) { mmi.ptMaxTrackSize.x = this.MaximumSize.Width; mmi.ptMaxTrackSize.y = this.MaximumSize.Height; } //------------------------- int aaa = 0x00000005; APPBARDATA pdat = new APPBARDATA(); SHAppBarMessage(aaa, ref pdat);if (pdat.uEdge == 0) //左
{ mmi.ptMaxPosition.x = Screen.PrimaryScreen.Bounds.Width - SystemInformation.WorkingArea.Width; mmi.ptMaxPosition.y = 0; } else if (pdat.uEdge == 1) //上 { mmi.ptMaxPosition.x = 0; mmi.ptMaxPosition.y = Screen.PrimaryScreen.Bounds.Height - SystemInformation.WorkingArea.Height; } else if (pdat.uEdge == 2) //右 { mmi.ptMaxPosition.x = 0; mmi.ptMaxPosition.y =0; } else if (pdat.uEdge == 3) //下 { mmi.ptMaxPosition.x = 0; mmi.ptMaxPosition.y = 0; }System.Runtime.InteropServices.Marshal.StructureToPtr(mmi, m.LParam, true);
} } #endregion