WPF 限制或释放鼠标在窗体内移动

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    public class User32
    {
        public struct RECT
        {
            public int LeftTopX;
            public int LeftTopY;
            public int RightBottomX;
            public int RightBottomY;
            public RECT(int ltx, int lty, int rbx, int rby)
            {
                LeftTopX = ltx;
                LeftTopY = lty;
                RightBottomX = rbx;
                RightBottomY = rby;
            }
        }
        [System.Runtime.InteropServices.DllImport("user32.dll")]
        static extern bool GetClipCursor(IntPtr lpRect);
        [System.Runtime.InteropServices.DllImport("user32.dll")]
        static extern bool ClipCursor(IntPtr lpRect);
        [System.Runtime.InteropServices.DllImport("User32.dll")]
        static extern bool ClipCursor(ref RECT lpRect);

        /// <summary>
        /// 限制
        /// </summary>
        /// <param name="ltx"></param>
        /// <param name="lty"></param>
        /// <param name="rbx"></param>
        /// <param name="rby"></param>
        public static void ClipCursor(int ltx, int lty, int rbx, int rby)
        {
            RECT rect = new RECT(ltx, lty, rbx, rby);
            ClipCursor(ref rect);
        }
        
        /// <summary>
        /// 释放
        /// </summary>
        public static void ClearCursor()
        {
            ClipCursor(IntPtr.Zero);
        }
    }

调用方式：

            User32.ClipCursor(
                (int)(Left + SystemParameters.WindowNonClientFrameThickness.Left + SystemParameters.WindowResizeBorderThickness.Left),
                (int)(Top + SystemParameters.WindowNonClientFrameThickness.Left + SystemParameters.WindowNonClientFrameThickness.Top),
                (int)(Left + Width - SystemParameters.WindowResizeBorderThickness.Left * 2),
                (int)(Top + Height - SystemParameters.WindowResizeBorderThickness.Left * 2));

这里的坐标需要考虑窗体边框的宽度。

释放：

User32.ClearCursor();