c#图片转ico图标

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/// <summary> /// Converts a PNG image to a icon (ico) /// </summary> /// <param name="inputPath">The input path</param> /// <param name="outputPath">The output path</param> /// <param name="size">The size (16x16 px by default)</param> /// <param name="preserveAspectRatio">Preserve the aspect ratio</param> /// <returns>Wether or not the icon was succesfully generated</returns> public static bool ConvertPNGToIcon(string inputPath, string outputPath, int size = 256, bool preserveAspectRatio = true) {     using (FileStream inputStream = new FileStream(inputPath, FileMode.Open))     using (FileStream outputStream = new FileStream(outputPath, FileMode.OpenOrCreate))     {         return ConvertToIcon(inputStream, outputStream, size, preserveAspectRatio);     } }    /// <summary> /// Converts a PNG image to a icon (ico) /// </summary> /// <param name="input">The input stream</param> /// <param name="output">The output stream</param> /// <param name="size">The size (16x16 px by default)</param> /// <param name="preserveAspectRatio">Preserve the aspect ratio</param> /// <returns>Wether or not the icon was succesfully generated</returns> public static bool ConvertPNGToIcon(Stream input, Stream output, int size = 16, bool preserveAspectRatio = false) {     Bitmap inputBitmap = (Bitmap)Bitmap.FromStream(input);     if (inputBitmap != null)     {         int width, height;         if (preserveAspectRatio)         {             width = size;             height = inputBitmap.Height / inputBitmap.Width * size;         }         else         {             width = height = size;         }         Bitmap newBitmap = new Bitmap(inputBitmap, new System.Drawing.Size(width, height));         if (newBitmap != null)         {             // save the resized png into a memory stream for future use             using (MemoryStream memoryStream = new MemoryStream())             {                 newBitmap.Save(memoryStream, ImageFormat.Png);                    BinaryWriter iconWriter = new BinaryWriter(output);                 if (output != null && iconWriter != null)                 {                     // 0-1 reserved, 0                     iconWriter.Write((byte)0);                     iconWriter.Write((byte)0);                        // 2-3 image type, 1 = icon, 2 = cursor                     iconWriter.Write((short)1);                        // 4-5 number of images                     iconWriter.Write((short)1);                        // image entry 1                     // 0 image width                     iconWriter.Write((byte)width);                     // 1 image height                     iconWriter.Write((byte)height);                        // 2 number of colors                     iconWriter.Write((byte)0);                        // 3 reserved                     iconWriter.Write((byte)0);                        // 4-5 color planes                     iconWriter.Write((short)0);                        // 6-7 bits per pixel                     iconWriter.Write((short)32);                        // 8-11 size of image data                     iconWriter.Write((int)memoryStream.Length);                        // 12-15 offset of image data                     iconWriter.Write((int)(6 + 16));                        // write image data                     // png data must contain the whole png data file                     iconWriter.Write(memoryStream.ToArray());                        iconWriter.Flush();                        return true;                 }             }         }         return false;     }     return false; }       调用： string sourceurl = @"C:\Users\wh\Desktop\摄像头1-01.png";             string outUrl = @"C:\Users\wh\Desktop\pt.ico";             bool bl = FileHelper.ConvertPNGToIcon(sourceurl, outUrl);