如何将.bmp，.png文件转换为mvc4中的.jpeg文件 [英] How to convert .bmp,.png files to .jpeg files in mvc4

问题描述

嗨朋友们，

我在mvc4中使用fileupload控件......我需要的是我应该转换所有.bmp图像文件，.png图像文件，.gif图像文件等.......所有到.Jpeg文件..并转换为.jpeg文件，如果它小于4 MB我应该将其保存到数据库/应用程序路径........当它超过4 MB我应该压缩它并将其保存为.jpeg文件......任何人都可以给我一个样本

Hi Friends,
I am using a fileupload control in mvc4 ...... What i need is that i should convert all .bmp image files , .png image files ,.gif image files etc ....... all to .Jpeg Files .. And After converting to .jpeg files if it is less than 4 MB i should save it into database/Application path ........ And when it is more than 4 mb i should compress it and save it as .jpeg files ...... can anyone give me a sample

推荐答案

你可以尝试这样做将图像压缩为特定大小

You can try this so compress image into specific size

if (Request.Files.Count > 0)
            {
                HttpPostedFileBase file = Request.Files[0];
                if (file != null && file.ContentLength > 0)
                {
                    string path = Path.GetFileName(file.FileName) + ".jpeg";

                    string saveFilePath = Path.Combine(Server.MapPath("/Images/"), path);

                    // Resize Image
                    if ((file.ContentLength / 1024) > 4096)
                    {
                        var newSize = new Size(100, 100);

                        using (var originalImage = System.Drawing.Image.FromFile(file.FileName))
                        {
                            using (var newImage = new Bitmap(newSize.Width, newSize.Height))
                            {
                                using (var canvas = Graphics.FromImage(newImage))
                                {
                                    canvas.SmoothingMode = SmoothingMode.AntiAlias;
                                    canvas.InterpolationMode = InterpolationMode.HighQualityBicubic;
                                    canvas.PixelOffsetMode = PixelOffsetMode.HighQuality;
                                    canvas.DrawImage(originalImage, new System.Drawing.Rectangle(new Point(0, 0), newSize));
                                    newImage.Save(saveFilePath, originalImage.RawFormat);
                                }
                            }
                        }
                    }
                    else
                    {
                        file.SaveAs(saveFilePath);
                    }
                }
            }

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