利用C#转换图片格式,可转换为ico

using System;using System.Collections.Generic;using System.Text;using System.Drawing;using System.Drawing.Imaging;using System.IO;namespace paomiangege{ public class ImageConvert { private int ICON_W = 64; private int ICON_H = 64; public ImageConvert() { } //fileinpath,origaly picture file path,fileoutpath save filepath,index the ImageFormat you want to convert to public string Convert(string fileinpath, string fileoutpath, string index) { try { Bitmap bitmap = new Bitmap(fileinpath); index = index.ToLower(); switch (index) { case "jpg": bitmap.Save(fileoutpath, ImageFormat.Jpeg); break; case "jpeg": bitmap.Save(fileoutpath, ImageFormat.Jpeg); break; case "bmp": bitmap.Save(fileoutpath, ImageFormat.Bmp); break; case "png": bitmap.Save(fileoutpath, ImageFormat.Png); break; case "emf": bitmap.Save(fileoutpath, ImageFormat.Emf); break; case "gif": bitmap.Save(fileoutpath, ImageFormat.Gif); break; case "wmf": bitmap.Save(fileoutpath, ImageFormat.Wmf); break; case "exif": bitmap.Save(fileoutpath, ImageFormat.Exif); break; case "tiff": { Stream stream = File.Create(fileoutpath); bitmap.Save(stream, ImageFormat.Tiff); stream.Close(); } break; case "ico": { Icon ico; Stream stream = File.Create(fileoutpath); ico = BitmapToIcon(bitmap, false); ico.Save(stream); // save the icon stream.Close(); }; break; default: return "Error!"; } return "Success!"; } catch(Exception ex) { return ex.Message; } } public string Convert(string fileinpath, string fileoutpath, string index,int width,int height) { if (width <= 0 || height <= 0) return "error!size illegal!"; try { Bitmap mybitmap = new Bitmap(fileinpath); Bitmap bitmap = new Bitmap(mybitmap, width, height); index = index.ToLower(); switch (index) { case "jpg": bitmap.Save(fileoutpath, ImageFormat.Jpeg); break; case "jpeg": bitmap.Save(fileoutpath, ImageFormat.Jpeg); break; case "bmp": bitmap.Save(fileoutpath, ImageFormat.Bmp); break; case "png": bitmap.Save(fileoutpath, ImageFormat.Png); break; case "emf": bitmap.Save(fileoutpath, ImageFormat.Emf); break; case "gif": bitmap.Save(fileoutpath, ImageFormat.Gif); break; case "wmf": bitmap.Save(fileoutpath, ImageFormat.Wmf); break; case "exif": bitmap.Save(fileoutpath, ImageFormat.Exif); break; case "tiff": { Stream stream = File.Create(fileoutpath); bitmap.Save(stream, ImageFormat.Tiff); stream.Close(); } break; case "ico": { if (height > 256 || width > 256)//ico maxsize 256*256 return "Error!Size illegal!"; Icon ico; ICON_H = height; ICON_W = width; Stream stream = File.Create(fileoutpath); ico = BitmapToIcon(mybitmap, true); ico.Save(stream); // save the icon stream.Close(); }; break; default: return "Error!"; } return "Success!"; } catch (Exception ex) { return ex.Message; } } private Icon BitmapToIcon(Bitmap obm, bool preserve) { Bitmap bm; // if not preserving aspect if (!preserve) // if not preserving aspect bm = new Bitmap(obm, ICON_W, ICON_H); // rescale from original bitmap // if preserving aspect drop excess significance in least significant direction else // if preserving aspect { Rectangle rc = new Rectangle(0, 0, ICON_W, ICON_H); if (obm.Width >= obm.Height) // if width least significant { // rescale with width based on max icon height bm = new Bitmap(obm, (ICON_H * obm.Width) / obm.Height, ICON_H); rc.X = (bm.Width - ICON_W) / 2; // chop off excess width significance if (rc.X < 0) rc.X = 0; } else // if height least significant { // rescale with height based on max icon width bm = new Bitmap(obm, ICON_W, (ICON_W * obm.Height) / obm.Width); rc.Y = (bm.Height - ICON_H) / 2; // chop off excess height significance if (rc.Y < 0) rc.Y = 0; } bm = bm.Clone(rc, bm.PixelFormat); // bitmap for icon rectangle } // create icon from bitmap Icon icon = Icon.FromHandle(bm.GetHicon()); // create icon from bitmap bm.Dispose(); // dispose of bitmap return icon; // return icon } }}