Asp.net MVC-从请求的网址获取调整大小的图片会出现404错误

我提供使用以下解决方案：
我使用Asp.net MVC但有一些更改，您可以将其用于每个站点
1.在web.config中添加以下行

  <httpErrors>
     <remove statusCode="404" />
  <error statusCode="404" path="/Home/Http404/" responseMode="ExecuteURL" />
  </httpErrors>

2.将此路由添加到Routeconfig.cs

       routes.MapRoute(
            "404-PageNotFound",
            "{*url}",
            new { controller = "Home", action = "Http404" });

3.对于控制器代码，请使用以下代码：

 [MySite.WebUI.Infrastructure.AjaxCrawlable]
        public ActionResult Index()
        {
            string url = Request.Url.AbsolutePath;
            if (url.LastIndexOf('.') != -1)
            {
                string extention = url.Substring(url.LastIndexOf('.') + 1).ToLower();
                var extentionList = new string[] { "jpg", "png", "gif", "tif" };
                if (extentionList.Contains(extention))
                {
                    try
                    {
                        string path = System.Web.Hosting.HostingEnvironment.MapPath(Request.Url.AbsolutePath);
                        string FileName = System.IO.Path.GetFileNameWithoutExtension(path);
                        string extentionnow = System.IO.Path.GetExtension(path);
                        var _mainpath = Request.Url.AbsolutePath.Substring(0, Request.Url.AbsolutePath.LastIndexOf("/"));
                        string _mainfileName = FileName.Substring(0, (FileName.LastIndexOf('_')));
                        int _imagesize = int.Parse(FileName.Substring((FileName.LastIndexOf('_') + 1)));
                        if (_imagesize != null || _imagesize != 0)
                        {
                            var t = Resize.FindResizeImage("~" + _mainpath + "/" + _mainfileName + extentionnow, _imagesize);
                            return new RedirectResult(Request.Url.AbsolutePath);
                        }
                    }
                    catch
                    {
                        return View();
                    }

                }
            }
            else
                return View();
            return View();
        }

4. 添加此类以调整图像大小

使用系统；使用System.Collections.Generic; 使用System.Drawing; 使用System.Drawing.Drawing2D; 使用System.IO; 使用System.Linq; 使用System.Web; 使用System.Web.Mvc;

namespace MySite.WebUI.Models
{
    public static class Resize
    {
        public static string FindResizeImage(string path, int size)
        {

            var _serverpath = HttpContext.Current.Server.MapPath(path);
            if (System.IO.File.Exists(_serverpath))
            {
                var Extention = Path.GetExtension(path);
                var _pathresize = path.Substring(0, path.LastIndexOf(".")) + "_" + size.ToString() + Extention;
                var _serverpathresize = HttpContext.Current.Server.MapPath(_pathresize);

                if (System.IO.File.Exists(_serverpathresize))
                {
                    return _pathresize.Substring(1, _pathresize.Length - 1);
                }
                else
                {
                    Resize.Resizeing(HttpContext.Current.Server.MapPath(path), HttpContext.Current.Server.MapPath(_pathresize), size);
                    return _pathresize;
                }
            }
            return null;
        }
        public static void Resizeing(string imageFile, string outputFile, int size)
        {
            using (var srcImage = Image.FromFile(imageFile))
            {
                using (var newImage = new Bitmap(size, size))
                using (var graphics = Graphics.FromImage(newImage))
                {
                    graphics.SmoothingMode = SmoothingMode.AntiAlias;
                    graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
                    graphics.PixelOffsetMode = PixelOffsetMode.HighQuality;
                    graphics.DrawImage(srcImage, new Rectangle(0, 0, size, size));
                    newImage.Save(outputFile);
                }
            }
        }
    }
}