有的时候，一个自定义的鼠标光标能给你的程序增色不少。本文这里介绍一下如何在.net桌面程序中自定义鼠标光标。由于.net的桌面程序分为WinForm和WPF两种，这里分别介绍一下。
WinForm程序
对于WinForm程序，可以通过修改Control.Cursor属性来实现光标的修改，如果我们有光标文件的话，可以直接通过如下代码实现自定义光标：
this.Cursor = new Cursor("myCursor.cur");
但这种方式不是本文介绍的重点，本文主要介绍如何自己绘制光标，这样则具有更多的可控性和灵活性。
创建一个自定义光标，首先需要定义需要一个光标结构 ICONINFO ，它的.net版本如下：
public struct IconInfo
{
publicboolfIcon;
publicintxHotspot;
publicintyHotspot;
publicIntPtrhbmMask;
publicIntPtrhbmColor;
}
然后通过GetIconInfo and CreateIconIndirect两个函数来合成光标。完整代码如下：
1 ????public class CursorHelper 2 ????{ 3 ????????static class NativeMethods 4 ????????{ 5 ????????????public struct IconInfo 6 ????????????{ 7 ????????????????public bool fIcon; 8 ????????????????public int xHotspot; 9 ????????????????public int yHotspot;10 ????????????????public IntPtr hbmMask;11 ????????????????public IntPtr hbmColor;12 ????????????}13 14 ????????????[DllImport("user32.dll")]15 ????????????public static extern IntPtr CreateIconIndirect(ref IconInfo icon);16 17 18 ????????????[DllImport("user32.dll")]19 ????????????[return: MarshalAs(UnmanagedType.Bool)]20 ????????????public static extern bool GetIconInfo(IntPtr hIcon, ref IconInfo pIconInfo);21 ????????}22 23 ????????public static Cursor CreateCursor(Bitmap bmp, int xHotSpot, int yHotSpot)24 ????????{25 ????????????var icon = new NativeMethods.IconInfo26 ????????????{27 ????????????????xHotspot = xHotSpot,28 ????????????????yHotspot = yHotSpot,29 ????????????????fIcon = false30 ????????????};31 32 ????????????NativeMethods.GetIconInfo(bmp.GetHicon(), ref icon);33 ????????????return new Cursor(NativeMethods.CreateIconIndirect(ref icon));34 ????????}35 ????}测试代码为：
using (Bitmap bitmap = new Bitmap(21, 26))
using (Graphics g = Graphics.FromImage(bitmap))
{
g.DrawRectangle(Pens.Red, 0, 0, 20, 25);
this.Cursor = CursorHelper.CreateCursor(bitmap, 3, 3);
}
WPF程序
至于WPF程序，和WinForm程序是非常类似的，一方面，它也可以通过光标文件来实现写入Cursor属性来自定义光标文件。
至于自己绘制光标，上面的代码基本上也是可以复用的，不过相对的要重新封装一下，完整代码如下：
1 ????public class CursorHelper 2 ????{ 3 ????????static class NativeMethods 4 ????????{ 5 ????????????public struct IconInfo 6 ????????????{ 7 ????????????????public bool fIcon; 8 ????????????????public int xHotspot; 9 ????????????????public int yHotspot;10 ????????????????public IntPtr hbmMask;11 ????????????????public IntPtr hbmColor;12 ????????????}13 14 ????????????[DllImport("user32.dll")]15 ????????????public static extern SafeIconHandle CreateIconIndirect(ref IconInfo icon);16 17 ????????????[DllImport("user32.dll")]18 ????????????public static extern bool DestroyIcon(IntPtr hIcon);19 20 ????????????[DllImport("user32.dll")]21 ????????????[return: MarshalAs(UnmanagedType.Bool)]22 ????????????public static extern bool GetIconInfo(IntPtr hIcon, ref IconInfo pIconInfo);23 ????????}24 25 ????????[SecurityPermission(SecurityAction.LinkDemand, UnmanagedCode = true)]26 ????????class SafeIconHandle : SafeHandleZeroOrMinusOneIsInvalid27 ????????{28 ????????????public SafeIconHandle()29 ????????????????: base(true)30 ????????????{31 ????????????}32 33 ????????????protected override bool ReleaseHandle()34 ????????????{35 ????????????????return NativeMethods.DestroyIcon(handle);36 ????????????}37 ????????}38 39 ????????static Cursor InternalCreateCursor(System.Drawing.Bitmap bitmap, int xHotSpot, int yHotSpot)40 ????????{41 ????????????var iconInfo = new NativeMethods.IconInfo42 ????????????{43 ????????????????xHotspot = xHotSpot,44 ????????????????yHotspot = yHotSpot,45 ????????????????fIcon = false46 ????????????};47 48 ????????????NativeMethods.GetIconInfo(bitmap.GetHicon(), ref iconInfo);49 50 ????????????var cursorHandle = NativeMethods.CreateIconIndirect(ref iconInfo);51 ????????????return CursorInteropHelper.Create(cursorHandle);52 ????????}53 54 ????????public static Cursor CreateCursor(UIElement element, int xHotSpot = 0, int yHotSpot = 0)55 ????????{56 ????????????element.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));57 ????????????element.Arrange(new Rect(new Point(), element.DesiredSize));58 59 ????????????var renderTargetBitmap = new RenderTargetBitmap(60 ????????????????(int)element.DesiredSize.Width, (int)element.DesiredSize.Height,61 ????????????????96, 96, PixelFormats.Pbgra32);62 63 ????????????renderTargetBitmap.Render(element);64 65 ????????????var encoder = new PngBitmapEncoder();66 ????????????encoder.Frames.Add(BitmapFrame.Create(renderTargetBitmap));67 68 ????????????using (var memoryStream = new MemoryStream())69 ????????????{70 ????????????????encoder.Save(memoryStream);71 ????????????????using (var bitmap = new System.Drawing.Bitmap(memoryStream))72 ????????????????{73 ????????????????????return InternalCreateCursor(bitmap, xHotSpot, yHotSpot);74 ????????????????}75 ????????????}76 ????????}77 ????}需要注意的是，由于使用的System.Drawing.BitMap，是需要引用System.Drawing.dll的
封装之后，是可以直接传入UIElement作为自绘制的光标的，得益于WPF的强大绘图功能，是可以非常容易的绘制漂亮的光标的。测试代码如下：
this.Cursor= CursorHelper.CreateCursor(new UserControl1());
在.net桌面程序中自定义鼠标光标
原文地址：https://www.cnblogs.com/lonelyxmas/p/9926427.html