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/// <summary> |
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/// 为图片生成缩略图 |
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/// </summary> |
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/// <param name="phyPath">原图片的路径</param> |
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/// <param name="width">缩略图宽</param> |
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/// <param name="height">缩略图高</param> |
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/// <returns></returns> |
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public System.Drawing.Image GetThumbnail(System.Drawing.Image image, int width, intheight) |
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{ |
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Bitmap bmp = newBitmap(width, height); |
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//从Bitmap创建一个System.Drawing.Graphics |
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System.Drawing.Graphics gr = System.Drawing.Graphics.FromImage(bmp); |
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//设置 |
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gr.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; |
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//下面这个也设成高质量 |
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gr.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality; |
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//下面这个设成High |
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gr.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; |
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//把原始图像绘制成上面所设置宽高的缩小图 |
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System.Drawing.Rectangle rectDestination = newSystem.Drawing.Rectangle(0, 0, width, height); |
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|
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gr.DrawImage(image, rectDestination, 0, 0, image.Width, image.Height, GraphicsUnit.Pixel); |
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returnbmp; |
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} |
调用方法
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HttpPostedFile file = photoFile.PostedFile; |
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if(!file.ContentType.Contains("image")) |
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{ |
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return"照片格式不合法"; |
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} |
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stringext = Path.GetExtension(file.FileName).ToLower(); |
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if (ext != ".jpg" && ext != ".gif" && ext != ".png"&& ext != ".jpeg") |
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{ |
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return"请您上传jpg、gif、png图片"; |
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} |
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if(file.ContentLength > 5 * 1024 * 1024) |
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{ |
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return"请您上传512字节内的图片"; |
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} |
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stringnewName = Guid.NewGuid().ToString(); |
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stringtempPath = "upload/"; |
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stringimg = tempPath + newName + ext; |
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stringfilePath = Server.MapPath(img); |
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if(!Directory.Exists(tempPath)) |
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{ |
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Directory.CreateDirectory(tempPath); |
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} |
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using(System.Drawing.Image originalImage = System.Drawing.Image.FromStream(file.InputStream)) |
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{ |
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GetThumbnail(originalImage, 504, 374).Save(filePath); |
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} |