上传图⽚代码总结潇湘的博客Top1.上传图⽚：其中FileUpload控件不⽀持多选。
当上传图⽚或者视频时，要设置web.config中<system.web><httpRuntime maxRequestLength="2097150"/>上传的视频的⼤⼩限制</system.web>string webFilePath = Server.MapPath("ImgUpload/" + fileName);FileUpload.SaveAs(webFilePath);//保存到服务器上2.⽣成缩略图/// <summary>/// ⽣成缩略图/// </summary>/// <param name="originalImagePath">源图路径（物理路径）</param>/// <param name="thumbnailPath">缩略图路径（物理路径）</param>/// <param name="width">缩略图宽度</param>/// <param name="height">缩略图⾼度</param>/// <param name="mode">⽣成缩略图的⽅式</param>public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode) {System.Drawing.Image originalImage = System.Drawing.Image.FromFile(originalImagePath);int towidth = width;int toheight = height;int x = 0;int y = 0;int ow = originalImage.Width;int oh = originalImage.Height;switch (mode){case "HW"://指定⾼宽缩放（可能变形）break;case "W"://指定宽，⾼按⽐例toheight = originalImage.Height * width / originalImage.Width;break;case "H"://指定⾼，宽按⽐例towidth = originalImage.Width * height / originalImage.Height;break;case "Cut"://指定⾼宽裁减（不变形）if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight){oh = originalImage.Height;ow = originalImage.Height * towidth / toheight;y = 0;x = (originalImage.Width - ow) / 2;}else{ow = originalImage.Width;oh = originalImage.Width * height / towidth;x = 0;y = (originalImage.Height - oh) / 2;}break;default:break;}//新建⼀个bmp图⽚System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight);//新建⼀个画板System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);//设置⾼质量插值法g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;//设置⾼质量,低速度呈现平滑程度g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;//清空画布并以透明背景⾊填充g.Clear(System.Drawing.Color.Transparent);//在指定位置并且按指定⼤⼩绘制原图⽚的指定部分g.DrawImage(originalImage, new System.Drawing.Rectangle(0, 0, towidth, toheight),new System.Drawing.Rectangle(x, y, ow, oh),System.Drawing.GraphicsUnit.Pixel);try{//以jpg格式保存缩略图bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);}catch (System.Exception e){throw e;}finally{originalImage.Dispose();bitmap.Dispose();g.Dispose();}}3.给图⽚加⽔印/**//// <summary>/// 在图⽚上增加⽂字⽔印/// </summary>/// <param name="Path">原服务器图⽚路径</param>/// <param name="Path_sy">⽣成的带⽂字⽔印的图⽚路径</param>protected void AddWater(string Path, string Path_sy){string addText = "";System.Drawing.Image image = System.Drawing.Image.FromFile(Path);System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);g.DrawImage(image, 0, 0, image.Width, image.Height);System.Drawing.Font f = new System.Drawing.Font("Verdana", 60);//字体System.Drawing.Brush b = new System.Drawing.SolidBrush(System.Drawing.Color.Green);g.DrawString(addText, f, b, 35, 35);g.Dispose();image.Save(Path_sy);image.Dispose();}/**//// <summary>/// 在图⽚上⽣成图⽚⽔印/// </summary>/// <param name="Path">原服务器图⽚路径</param>/// <param name="Path_syp">⽣成的带图⽚⽔印的图⽚路径</param>/// <param name="Path_sypf">⽔印图⽚路径</param>protected void AddWaterPic(string Path, string Path_syp, string Path_sypf){System.Drawing.Image image = System.Drawing.Image.FromFile(Path);System.Drawing.Image copyImage = System.Drawing.Image.FromFile(Path_sypf);System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);g.DrawImage(copyImage, new System.Drawing.Rectangle(image.Width - copyImage.Width, image.Height - copyImage.Height, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, System.Drawing.GraphicsUnit.Pixel);g.Dispose();image.Save(Path_syp);image.Dispose();}//给图⽚加字//加上标题string pathImage = "images/upload/" + name;Image image = Image.FromFile(context.Request.MapPath(pathImage));//画⿊框Bitmap bit = new Bitmap(image.Width+204,image.Height+204);Graphics g = Graphics.FromImage(bit);//⽩边Bitmap bitmap = new Bitmap( bit.Width-2,bit.Height-2);Graphics gwhite = Graphics.FromImage(bitmap);gwhite.FillRectangle(Brushes.White, 100, 100,bitmap.Width-200,bitmap.Height-200);//填充照⽚g.DrawString("碣⽯潇湘", new Font("楷体", 15), Brushes.Red, bitmap.Width-600, bitmap.Height - 200);gwhite.DrawImage(image,150,150,image.Width-100,image.Height-100);bitmap.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);g.Dispose();gwhite.Dispose();。
