今天老大讓做一個圖片壓縮功能，自己在網上找了一些解決方法，也同時對方法進行了提煉！

在下面的代碼中會有一個字段Encoder.Quality 字段，這個對應的有個一個values是神奇的值

MSDN解釋是：Quality 類別將指定的圖像壓縮級別。 在用于構造 EncoderParameter, ，質量類別的有用值的范圍是從 0 到 100。 指定的數字越，越高壓縮和圖像質量也因此越低。 零將為您提供最低的圖像質量和 100 最高。

當將一個參數傳遞給圖像編碼器中時，將參數封裝在 EncoderParameter 對象。 域中的一個 EncoderParameter 對象是指定的參數的類別的 GUID。 使用的靜態字段 Encoder 類來檢索 Encoder ，其中包含參數的所需類別。

內置的圖像編碼器 GDI+ 接收屬于多個類別的參數。 下表列出了所有類別，每個類別關聯的 GUID。

里面有6個方法，如下

方法作用方法名

按質量比和尺寸收縮唄數,生成縮略圖，保存為另外路勁	getThumImage(String sourceFile, long quality, int multiple, String outputFile)
按質量比和尺寸收縮唄數,生成縮略圖;保存在同一路徑	getThumImage(String sourceFile, long quality, int multiple)
按圖片尺寸大小壓縮圖片 ，保存在不同路徑	ImageByMultiple(String sourceFile, int multiple, String outputFile)
按圖片尺寸大小壓縮圖片 ，保存在同一路徑	ImageByMultiple(String sourceFile, int multiple)
質量壓縮比，保存在不同一路徑	ImageByQuality(String sourceFile, int quality, String outputFile)
按質量壓縮比壓縮圖片，保存在同一路徑	ImageByQuality(String sourceFile, int quality)

public partial class WebForm2 : System.Web.UI.Page{protected void Page_Load(object sender, EventArgs e){GetFileInfo(@"D:\tupian");//string pathPerc = @"D:\Koala.jpg";//string source = @"D:\Koala.jpg";////if (!File.Exists(pathPerc))////{//// File.Create(pathPerc).Close();////}////else////{//// File.Delete(pathPerc);//// File.Create(pathPerc).Close();////}//getThumImage(source, 18, 3, pathPerc); }private void GetFileInfo(string filePath){DirectoryInfo directoryInfo = new DirectoryInfo(filePath);try{foreach (DirectoryInfo childDirectoryInfo in directoryInfo.GetDirectories()){string name = childDirectoryInfo.Name.ToString();GetFileInfo(filePath + "\\" + childDirectoryInfo.Name.ToString());}foreach (FileInfo fileInfo in directoryInfo.GetFiles()){//Length單位為bytes， 1k=1024bif (fileInfo.Length > 400 * 1024){// getThumImage(fileInfo.FullName, 100, 1, fileInfo.FullName);// ImageByQuality(fileInfo.FullName, 18);// ImageByMultiple(fileInfo.FullName,1);FixSize(fileInfo.FullName, 200, 100, fileInfo.FullName);}}}catch{}}#region 調用圖片處理的方法/// <summary> /// 按質量比和尺寸收縮唄數,生成縮略圖，保存為另外路勁/// </summary> /// <param name="sourceFile">原始圖片文件</param> /// <param name="quality">質量壓縮比</param> /// <param name="multiple">收縮倍數</param> /// <param name="outputFile">輸出文件名</param> /// <returns>成功返回true,失敗則返回false</returns> public static bool getThumImage(String sourceFile, long quality, int multiple, String outputFile){bool flag = false;try{flag = ThumImage(sourceFile, quality, multiple, outputFile);}catch{flag = false;}return flag;}/**//// <summary> /// 按質量比和尺寸收縮唄數,生成縮略圖;保存在同一路徑/// </summary> /// <param name="sourceFile">原始圖片文件</param> /// <param name="quality">質量壓縮比</param> /// <param name="multiple">收縮倍數</param> /// <param name="outputFile">輸出文件名</param> /// <returns>成功返回true,失敗則返回false</returns> public static bool getThumImage(String sourceFile, long quality, int multiple){bool flag = false;try{flag = ThumImage(sourceFile, quality, multiple, sourceFile);}catch{flag = false;}return flag;}/// <summary> /// 按圖片尺寸大小壓縮圖片 ，保存在不同路徑/// </summary> /// <param name="sourceFile">原始圖片文件</param> /// <param name="multiple">收縮倍數</param> /// <returns>成功返回true,失敗則返回false</returns> public static bool ImageByMultiple(String sourceFile, int multiple, String outputFile){bool flag = false;try{flag = ThumImageByMultiple(sourceFile, multiple, outputFile);}catch{flag = false;}return flag;}/// <summary> /// 按圖片尺寸大小壓縮圖片 ，保存在同一路徑/// </summary> /// <param name="multiple">收縮倍數</param> /// <returns>成功返回true,失敗則返回false</returns> public static bool ImageByMultiple(String sourceFile, int multiple){bool flag = false;try{flag = ThumImageByMultiple(sourceFile, multiple, sourceFile);}catch{flag = false;}return flag;}/// <summary> /// 質量壓縮比，保存在不同一路徑/// </summary> /// <param name="sourceFile">原始圖片文件</param> /// <param name="quality">質量壓縮比</param> /// <returns>成功返回true,失敗則返回false</returns> public static bool ImageByQuality(String sourceFile, int quality, String outputFile){bool flag = false;try{flag = ThumImageByQuality(sourceFile, quality, outputFile);}catch{flag = false;}return flag;}/// <summary> /// 按質量壓縮比壓縮圖片，保存在同一路徑/// </summary> /// <param name="sourceFile">原始圖片文件</param> /// <param name="quality">質量壓縮比</param> /// <returns>成功返回true,失敗則返回false</returns> public static bool ImageByQuality(String sourceFile, int quality){bool flag = false;try{flag = ThumImageByQuality(sourceFile, quality, sourceFile);}catch{flag = false;}return flag;}#endregion#region 調用圖片處理具體方法/// <summary>/// 按照圖片質量生成圖片,/// </summary>/// <param name="sourceFile">原始圖片文件</param> /// <param name="quality">質量壓縮比</param> /// <param name="outputFile">輸出文件名</param> /// <returns>成功返回true,失敗則返回false</returns> private static bool ThumImageByQuality(String sourceFile, long quality, String outputFile){bool flag = false;try{long imageQuality = quality;Bitmap sourceImage = new Bitmap(sourceFile);ImageCodecInfo myImageCodecInfo = GetEncoderInfo("image/jpeg");System.Drawing.Imaging.Encoder myEncoder = System.Drawing.Imaging.Encoder.Quality;EncoderParameters myEncoderParameters = new EncoderParameters(1);EncoderParameter myEncoderParameter = new EncoderParameter(myEncoder, imageQuality);myEncoderParameters.Param[0] = myEncoderParameter;float xWidth = sourceImage.Width;float yWidth = sourceImage.Height;Bitmap newImage = new Bitmap((int)(xWidth), (int)(yWidth));Graphics g = Graphics.FromImage(newImage);g.DrawImage(sourceImage, 0, 0, xWidth, yWidth);sourceImage.Dispose();g.Dispose();newImage.Save(outputFile, myImageCodecInfo, myEncoderParameters);flag = true;}catch{flag = false;}return flag;}/// <summary>/// 生成縮略圖/// </summary>/// <param name="sourceFile">原始圖片文件</param> /// <param name="quality">質量壓縮比</param> /// <param name="multiple">收縮倍數</param> /// <param name="outputFile">輸出文件名</param> /// <returns>成功返回true,失敗則返回false</returns> private static bool ThumImage(String sourceFile, long quality, int multiple, String outputFile){bool flag = false;try{long imageQuality = quality;Bitmap sourceImage = new Bitmap(sourceFile);ImageCodecInfo myImageCodecInfo = GetEncoderInfo("image/jpeg");System.Drawing.Imaging.Encoder myEncoder = System.Drawing.Imaging.Encoder.Quality;EncoderParameters myEncoderParameters = new EncoderParameters(1);EncoderParameter myEncoderParameter = new EncoderParameter(myEncoder, imageQuality);myEncoderParameters.Param[0] = myEncoderParameter;float xWidth = sourceImage.Width;float yWidth = sourceImage.Height;Bitmap newImage = new Bitmap((int)(xWidth / multiple), (int)(yWidth / multiple));Graphics g = Graphics.FromImage(newImage);g.DrawImage(sourceImage, 0, 0, xWidth / multiple, yWidth / multiple);sourceImage.Dispose();g.Dispose();newImage.Save(outputFile, myImageCodecInfo, myEncoderParameters);flag = true;}catch{flag = false;}return flag;}/// <summary> /// 按圖片尺寸大小壓縮圖片 /// </summary> /// <param name="sourceFile">原始圖片文件</param> /// <param name="multiple">收縮倍數</param> /// <param name="outputFile">輸出文件名</param> /// <returns>成功返回true,失敗則返回false</returns> public static bool ThumImageByMultiple(String sourceFile, int multiple, String outputFile){try{Bitmap sourceImage = new Bitmap(sourceFile);ImageCodecInfo myImageCodecInfo = GetEncoderInfo("image/jpeg");float xWidth = sourceImage.Width;float yWidth = sourceImage.Height;Bitmap newImage = new Bitmap((int)(xWidth / multiple), (int)(yWidth / multiple));Graphics g = Graphics.FromImage(newImage);g.DrawImage(sourceImage, 0, 0, xWidth / multiple, yWidth / multiple);sourceImage.Dispose();g.Dispose();newImage.Save(outputFile);return true;}catch{return false;}}/// <summary> /// 按圖片尺寸大小壓縮圖片 /// </summary> /// <param name="sourceFile">原始圖片文件</param> /// <param name="multiple">收縮倍數</param> /// <param name="outputFile">輸出文件名</param> /// <returns>成功返回true,失敗則返回false</returns> public static bool FixSize(String sourceFile, int xWidth, int yWidth, String outputFile){try{Bitmap sourceImage = new Bitmap(sourceFile);ImageCodecInfo myImageCodecInfo = GetEncoderInfo("image/jpeg");Bitmap newImage = new Bitmap((int)(xWidth), (int)(yWidth));Graphics g = Graphics.FromImage(newImage);g.DrawImage(sourceImage, 0, 0, xWidth, yWidth);sourceImage.Dispose();g.Dispose();newImage.Save(outputFile);return true;}catch{return false;}}#endregion getThumImage/// <summary> /// 獲取圖片編碼信息 /// </summary> private static ImageCodecInfo GetEncoderInfo(String mimeType){int j;ImageCodecInfo[] encoders;encoders = ImageCodecInfo.GetImageEncoders();for (j = 0; j < encoders.Length; ++j){if (encoders[j].MimeType == mimeType)return encoders[j];}return null;}}

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