1 private bool UploadImg(FileUpload FileUpload, string FilePath, string imagess) 2 { 3 //string fileExtends = ""; 4 if (FileUpload.FileName.Trim().Length > 0) 5 { 6 string fileExt = System.IO.Path.GetExtension(FileUpload.FileName); 7 if (fileExt == ".jpg" || fileExt == ".gif" || fileExt == ".png" || fileExt == "ico") 8 { 9 try 10 { 11 if (FileUpload.PostedFile.ContentLength < 1048576) 12 { 13 14 //FileInfo fileinfo = new FileInfo(FileUpload.PostedFile.FileName); 15 //FileUpload.SaveAs(Server.MapPath(FilePath + imagess)); 16 System.Drawing.Image image = System.Drawing.Image.FromStream(new System.IO.MemoryStream(FileUpload.FileBytes)); 17 //if (GetPicThumbnail(image, FilePath + imagess, img1.Height, img1.Width, 100)) 18 //{ 19 // return true; 20 //} 21 //else 22 //{ 23 // return false; 24 //} 25 if (MakeThumbnail(image, Server.MapPath(FilePath + imagess), img1.Width, img1.Height, "Cut", "JPG")) 26 { 27 return true; 28 } 29 else 30 { 31 return false; 32 } 33 //FileUpload.SaveAs(Server.MapPath("UiMain\Employment\images\" + imagess)); 34 35 } 36 else 37 { 38 Page.ClientScript.RegisterStartupScript(Page.GetType(), "", "<script type="text/javascript"> new function(){alert('上传图片大小不能超过1MB');}</script>"); 39 return false; 40 } 41 } 42 catch (Exception ex) 43 { 44 Page.ClientScript.RegisterStartupScript(Page.GetType(), "", "<script type="text/javascript"> new function(){alert('发生错误'" + ex + "');}</script>"); 45 return false; 46 } 47 } 48 else 49 { 50 Page.ClientScript.RegisterStartupScript(Page.GetType(), "", "<script type="text/javascript"> new function(){alert('只允许上传jpg、gif、png、ico.文件！')};</script>"); 51 return false; 52 } 53 } 54 else 55 { 56 return false; 57 } 58 } 59 60 61 /// <summary> 62 /// 压缩图片并存储 63 /// </summary> 64 /// <param name="originalImagePath">源图路径（物理路径）</param> 65 /// <param name="thumbnailPath">压缩面存储路径（物理路径）</param> 66 /// <param name="width">压缩图宽度</param> 67 /// <param name="height">压缩图高度</param> 68 /// <param name="mode">生成压缩图的方式</param> 69 /// <param name="type">保存压缩图类型</param> 70 public static bool MakeThumbnail(System.Drawing.Image originalImagePath, string thumbnailPath, int width, int height, string mode, string type) 71 { 72 //System.Drawing.Image originalImage = System.Drawing.Image.FromFile(originalImagePath); 73 System.Drawing.Image originalImage = originalImagePath;//System.Drawing.Image.FromFile(originalImagePath); 74 bool isture = true; ; 75 int towidth = width; 76 int toheight = height; 77 int x = 0; 78 int y = 0; 79 int ow = originalImage.Width; 80 int oh = originalImage.Height; 81 switch (mode) 82 { 83 case "HW"://指定高宽缩放（可能变形） 84 break; 85 case "W"://指定宽，高按比例 86 toheight = originalImage.Height * width / originalImage.Width; 87 break; 88 case "H"://指定高，宽按比例 89 towidth = originalImage.Width * height / originalImage.Height; 90 break; 91 case "Cut"://指定高宽裁减（不变形） 92 if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight) 93 { 94 oh = originalImage.Height; 95 ow = originalImage.Height * towidth / toheight; 96 y = 0; 97 x = (originalImage.Width - ow) / 2; 98 } 99 else 100 { 101 ow = originalImage.Width; 102 oh = originalImage.Width * height / towidth; 103 x = 0; 104 y = (originalImage.Height - oh) / 2; 105 } 106 break; 107 case "DB"://等比缩放（不变形，如果高大按高，宽大按宽缩放） 108 if ((double)originalImage.Width / (double)towidth < (double)originalImage.Height / (double)toheight) 109 { 110 toheight = height; 111 towidth = originalImage.Width * height / originalImage.Height; 112 } 113 else 114 { 115 towidth = width; 116 toheight = originalImage.Height * width / originalImage.Width; 117 } 118 break; 119 default: 120 break; 121 } 122 //新建一个bmp图片 123 System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight); 124 //新建一个画板 125 System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap); 126 //设置高质量插值法 127 g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; 128 //设置高质量,低速度呈现平滑程度 129 g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; 130 //清空画布并以透明背景色填充 131 g.Clear(System.Drawing.Color.Transparent); 132 //在指定位置并且按指定大小绘制原图片的指定部分 133 g.DrawImage(originalImage, new System.Drawing.Rectangle(0, 0, towidth, toheight), 134 new System.Drawing.Rectangle(x, y, ow, oh), 135 System.Drawing.GraphicsUnit.Pixel); 136 try 137 { 138 //保存缩略图 139 if (type == "JPG") 140 { 141 bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg); 142 } 143 if (type == "BMP") 144 { 145 bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Bmp); 146 } 147 if (type == "GIF") 148 { 149 bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Gif); 150 } 151 if (type == "PNG") 152 { 153 bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Png); 154 } 155 } 156 catch (System.Exception e) 157 { 158 isture = false; 159 } 160 finally 161 { 162 originalImage.Dispose(); 163 bitmap.Dispose(); 164 g.Dispose(); 165 } 166 return isture; 167 } 168 169 170 /// <summary> 171 /// 无损压缩图片 172 /// </summary> 173 /// <param name="Image">原图片</param> 174 /// <param name="dFile">压缩后保存位置</param> 175 /// <param name="dHeight">高度</param> 176 /// <param name="dWidth"></param> 177 /// <param name="flag">压缩质量 1-100</param> 178 /// <returns></returns> 179 public bool GetPicThumbnail(System.Drawing.Image Image, string dFile, int dHeight, int dWidth, int flag) 180 { 181 System.Drawing.Image iSource = Image; 182 ImageFormat tFormat = iSource.RawFormat; 183 int sW = 0, sH = 0; 184 //按比例缩放 185 Size tem_size = new Size(iSource.Width, iSource.Height); 186 if (tem_size.Width > dHeight || tem_size.Width > dWidth) //将**改成c#中的或者操作符号 187 { 188 if ((tem_size.Width * dHeight) > (tem_size.Height * dWidth)) 189 { 190 sW = dWidth; 191 sH = (dWidth * tem_size.Height) / tem_size.Width; 192 } 193 else 194 { 195 sH = dHeight; 196 sW = (tem_size.Width * dHeight) / tem_size.Height; 197 } 198 } 199 else 200 { 201 sW = tem_size.Width; 202 sH = tem_size.Height; 203 } 204 Bitmap ob = new Bitmap(dWidth, dHeight); 205 Graphics g = Graphics.FromImage(ob); 206 g.Clear(Color.WhiteSmoke); 207 g.CompositingQuality = CompositingQuality.HighQuality; 208 g.SmoothingMode = SmoothingMode.HighQuality; 209 g.InterpolationMode = InterpolationMode.HighQualityBicubic; 210 g.DrawImage(iSource, new Rectangle((dWidth - sW) / 2, (dHeight - sH) / 2, sW, sH), 0, 0, iSource.Width, iSource.Height, GraphicsUnit.Pixel); 211 g.Dispose(); 212 //以下代码为保存图片时，设置压缩质量 213 EncoderParameters ep = new EncoderParameters(); 214 long[] qy = new long[1]; 215 qy[0] = flag;//设置压缩的比例1-100 216 EncoderParameter eParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, qy); 217 ep.Param[0] = eParam; 218 try 219 { 220 ImageCodecInfo[] arrayICI = ImageCodecInfo.GetImageEncoders(); 221 ImageCodecInfo jpegICIinfo = null; 222 for (int x = 0; x < arrayICI.Length; x++) 223 { 224 if (arrayICI[x].FormatDescription.Equals("JPEG")) 225 { 226 jpegICIinfo = arrayICI[x]; 227 break; 228 } 229 } 230 if (jpegICIinfo != null) 231 { 232 ob.Save(dFile, jpegICIinfo, ep);//dFile是压缩后的新路径 233 } 234 else 235 { 236 ob.Save(dFile, tFormat); 237 } 238 return true; 239 } 240 catch (Exception ex) 241 { 242 return false; 243 } 244 finally 245 { 246 iSource.Dispose(); 247 ob.Dispose(); 248 } 249 }