【WPF】自定义鼠标样式

 /// <summary>
    /// This class allow you create a Cursor form a Bitmap
    /// </summary>
    internal class BitmapCursor : SafeHandle
    {
        public override bool IsInvalid
        {
            get
            {
                return handle == (IntPtr)(-1);
            }
        }

        public static Cursor CreateBmpCursor(Bitmap cursorBitmap)
        {
            var c = new BitmapCursor(cursorBitmap);
            return CursorInteropHelper.Create(c);
        }

        public static Bitmap BitmapSourceToBitmap(BitmapSource source)
        {
            using (var stream = new MemoryStream())
            {
                var e = new BmpBitmapEncoder();
                e.Frames.Add(BitmapFrame.Create(source));
                e.Save(stream);
                var bmp = new Bitmap(stream);
                return bmp;
            }
        }

        protected BitmapCursor(Bitmap cursorBitmap)
            : base((IntPtr)(-1), true)
        {
            handle = cursorBitmap.GetHicon();
        }

        protected override bool ReleaseHandle()
        {
            bool result = DestroyIcon(handle);

            handle = (IntPtr)(-1);

            return result;
        }

        private static Cursor CreateMyCursor()
        {
            const int w = 25;
            const int h = 25;
            const int f = 4;

            var bmp = new Bitmap(w, h);

            Graphics g = Graphics.FromImage(bmp);
            g.SmoothingMode = SmoothingMode.HighQuality;
            g.InterpolationMode = InterpolationMode.HighQualityBicubic;

            var pen = new Pen(Brushes.Black, 2.0F);

            g.DrawEllipse(pen, new Rectangle(f, f, w - 2 * f, w - 2 * f));

            g.Flush();
            g.Dispose();
            pen.Dispose();

            return BitmapCursor.CreateBmpCursor(bmp);
        }

        [DllImport("user32")]
        private static extern bool DestroyIcon(IntPtr hIcon);
    }

WPF 中每个光标通过一个System.Windows.Input.Cursor表示，获取Cursor对象的最简单方法是使用Cursor类（位于System.Windows.Input名称空间）的静态属性。

如：

this.Cursor=Cursors.wait;  或<Button Cursor="wait">help</Button>

但是有一个例外，通过使用ForceCursor属性，父元素会覆盖子元素的光标位置，当把该属性设置为true时，会忽略子元素的Cursor属性，并且父元素的光标会被应用到内部的所有内容。

为了移除应用程序范围的光标覆盖设置，需要将Mouse.OverrideCursor属性设置为null。