C# .Net中鼠标Cursor的公用辅助类

有时，我们需要将背景透明的png或gif格式图片生成的Cursor，甚至将其旋转后生成旋转效果的Cursor（可指定热点）。

直接上源码：

using System;
 using System.IO;
 using System.Reflection;
 using System.Windows.Forms;
 using System.Drawing;namespace CommonUtils.Common
 {
     /// <summary>
     /// Cursor的公用辅助类
     /// </summary>
     public class CursorUtil
     {
         /// <summary>
         /// 从资源文件中调用指定名称的Cursor图标
         /// </summary>
         /// <param name="cursorName">Cursor图标的名称</param>
         /// <returns>Cursor图标</returns>
         public static Cursor GetCursorByResourceName(string cursorName)
         {
             using (Stream resStream = Assembly.GetExecutingAssembly().GetManifestResourceStream(cursorName))
             {
                 return new Cursor(resStream);
             }
         }        ///<summary>
         ///用背景透明的png或gif格式图片生成的Cursor
         /// 用法：
         /// Bitmap a=(Bitmap)Bitmap.FromFile("myCur.png");
         /// GetCursor(a, new Point(0, 0));
         /// </summary>
         /// <param name="cursorImg">背景透明的png或gif格式图片</param>
         /// <param name="hotPoint">热点</param>
         /// <returns>Cursor图标</returns>
         public static Cursor GetCursor(Bitmap cursorImg, Point hotPoint)
         {
             return GetRotatedCursor(cursorImg, hotPoint, 0);
         }        /// <summary>
         /// 用背景透明的png或gif格式图片生成，并指定旋转角度的Cursor
         /// 用法：
         /// Bitmap a=(Bitmap)Bitmap.FromFile("myCur.png");
         /// GetRotatedCursor(a, new Point(0, 0),30f);
         /// </summary>
         /// <param name="cursorImg">背景透明的png或gif格式图片</param>
         /// <param name="hotPoint">热点</param> 
         /// <param name="rotationAngle">指定Cursor图片的旋转角度</param>
         /// <returns>Cursor图标</returns>
         public static Cursor GetRotatedCursor(Bitmap cursorImg, Point hotPoint, float rotationAngle)
         {
             int hotX = hotPoint.X;
             int hotY = hotPoint.Y;
             Bitmap cursorBmp = new Bitmap(cursorImg.Width * 2 - hotX, cursorImg.Height * 2 - hotY);
             Graphics g = Graphics.FromImage(cursorBmp);
             g.Clear(Color.FromArgb(0, 0, 0, 0));
             //旋转指定角度
             if(rotationAngle!=0) g.RotateTransform(rotationAngle);
             g.DrawImage(cursorImg, cursorImg.Width - hotX, cursorImg.Height - hotY, cursorImg.Width, cursorImg.Height);
             Cursor result = new Cursor(cursorBmp.GetHicon());
             g.Dispose();
             cursorBmp.Dispose();            return result;
         }        /// <summary>
         /// 用背景透明的png或gif格式图片生成，并指定旋转角度的Cursor
         /// 用法：
         /// Bitmap a=(Bitmap)Bitmap.FromFile("myCur.png");
         /// GetRotatedCursor(a, new Point(0, 0),30f);
         /// </summary>
         /// <param name="cursorImg">背景透明的png或gif格式图片</param>
         /// <param name="hotPoint">热点</param> 
         /// <param name="rotationAngle">指定Cursor图片的旋转角度</param>
         /// <returns>Cursor图标</returns>
         public Cursor GetRotatedCursor(byte[] curFileBytes, Point hotPoint, float rotationAngle)
         {
             var origStream = new MemoryStream(curFileBytes);
             var cursorImg = new System.Drawing.Icon(origStream).ToBitmap();
             return GetRotatedCursor(cursorImg,  hotPoint,  rotationAngle);
         }
     }
 }