29Wx状态初始化

Work/ImgConvertToIcon.cs

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+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.Drawing.Imaging;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Work
+{
+    public class ImgConvertToIcon
+    {
+        #region 将图片缓存ico
+        ///
+        ///要转换为图标的Image对象
+        ///当image为null时是否返回null。false则抛空引用异常
+        /// 
+        public static Icon ConvertToIcon(Image image, bool nullTonull = false)
+        {
+            if (image == null)
+            {
+                if (nullTonull) { return null; }
+                throw new ArgumentNullException("image");
+            }
+
+            using (MemoryStream msImg = new MemoryStream()
+                              , msIco = new MemoryStream())
+            {
+                image.Save(msImg, ImageFormat.Png);
+
+                using (BinaryWriter bin = new BinaryWriter(msIco))
+                {
+                    //写图标头部
+                    bin.Write((short)0);           //0-1保留
+                    bin.Write((short)1);           //2-3文件类型。1=图标, 2=光标
+                    bin.Write((short)1);           //4-5图像数量（图标可以包含多个图像）
+
+                    bin.Write((byte)image.Width);  //6图标宽度
+                    bin.Write((byte)image.Height); //7图标高度
+                    bin.Write((byte)0);            //8颜色数（若像素位深>=8，填0。这是显然的，达到8bpp的颜色数最少是256，byte不够表示）
+                    bin.Write((byte)0);            //9保留。必须为0
+                    bin.Write((short)0);           //10-11调色板
+                    bin.Write((short)32);          //12-13位深
+                    bin.Write((int)msImg.Length);  //14-17位图数据大小
+                    bin.Write(22);                 //18-21位图数据起始字节
+
+                    //写图像数据
+                    bin.Write(msImg.ToArray());
+
+                    bin.Flush();
+                    bin.Seek(0, SeekOrigin.Begin);
+                    return new Icon(msIco);
+                }
+            }
+        }
+        #endregion
+    }
+}