Question

您可以在MVC中使用自定义扩展创建自定义httphandler吗？

我想要一个具有以下路径的图像处理程序（如果可能）， domain.com/picture/{id of the picture}

是否可以从MVC内部进行，还是必须在IIS 7中进行？

Answer 1

无需添加httphandler。你应该通过控制器在asp.net mvc中执行此操作例如：

public class PictureController : Controller
{
    public FileResult GetImage(int pictureID)
    {
        byte[] fileContents = null;
        //Get the file here.
        return File(fileContents, "image/jpeg");
    }
}

在global.asax中

你可以定义

routes.MapRoute("Picture-GetImage", "picture/{pictureID}",
new { controller = "Picture", action = "GetImage" }

您也可以使用 System.Web.Helpers.WebImage 帮助程序，或手动执行，例如：

public static byte[] ProcessCropResizeImage(string imageurl, Size outputSize)
{
    if (File.Exists(imageurl))
    {
        MemoryStream result = new MemoryStream();
        ImageCodecInfo codec = ImageCodecInfo.GetImageEncoders().FirstOrDefault(m => m.MimeType == "image/jpeg");
        if (codec == null)
            throw new ArgumentException(string.Format("Unsupported mimeType specified for encoding ({0})", "image/jpeg"), "encodingMimeType");
        EncoderParameters encoderParams = new EncoderParameters(1);
        encoderParams.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 85L);
        using (FileStream fs = File.OpenRead(imageurl))
        {
            using (Image image = Image.FromStream(fs))
            {
                using (Bitmap b = new Bitmap(outputSize.Width, outputSize.Height))
                {
                    using (Graphics g = Graphics.FromImage((Image)b))
                    {
                        g.CompositingQuality = CompositingQuality.HighQuality;
                        g.SmoothingMode = SmoothingMode.HighQuality;
                        g.InterpolationMode = InterpolationMode.HighQualityBicubic;
                        g.DrawImage(image, 0, 0, outputSize.Width, outputSize.Height);
                        g.DrawImage(image, outputSize.Width, outputSize.Height);
                    }
                    b.Save(result, codec, encoderParams);
                }
            }
        }

        return result.GetBuffer();
    }
    return null;
}

MVC 3使用具有不同扩展名的自定义httphandler

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