经过一番调查，我得出以下结论: 你有两个选择:

使用转换。非常有用的包:https://bundletransformer.codeplex.com/ 对于每个有问题的bundle，你需要以下转换: BundleResolver。Current = new CustomBundleResolver(); var cssTransformer = new StyleTransformer(); standardCssBundle.Transforms.Add (cssTransformer); bundles.Add (standardCssBundle);

优点:在这个解决方案中，你可以将你的包命名为任何你想要的名称=>，你可以将css文件从不同的目录组合到一个包中。 缺点:你需要转换每个有问题的捆绑包

使用相同的相对根作为包的名称，比如css文件所在的位置。优点:不需要转换。 缺点:在将来自不同目录的css表合并到一个bundle时受到限制。

这是一个Bundle Transform，它将用相对于css文件的url替换css url。只要把它添加到你的bundle中，它就会解决这个问题。

public class CssUrlTransform: IBundleTransform
{
    public void Process(BundleContext context, BundleResponse response) {
        Regex exp = new Regex(@"url\([^\)]+\)", RegexOptions.IgnoreCase | RegexOptions.Singleline);
        foreach (FileInfo css in response.Files) {
            string cssAppRelativePath = css.FullName.Replace(context.HttpContext.Request.PhysicalApplicationPath, context.HttpContext.Request.ApplicationPath).Replace(Path.DirectorySeparatorChar, '/');
            string cssDir = cssAppRelativePath.Substring(0, cssAppRelativePath.LastIndexOf('/'));
            response.Content = exp.Replace(response.Content, m => TransformUrl(m, cssDir));
        }
    }


    private string TransformUrl(Match match, string cssDir) {
        string url = match.Value.Substring(4, match.Length - 5).Trim('\'', '"');

        if (url.StartsWith("http://") || url.StartsWith("data:image")) return match.Value;

        if (!url.StartsWith("/"))
            url = string.Format("{0}/{1}", cssDir, url);

        return string.Format("url({0})", url);
    }

}

咧嘴笑的方法很好。

但是，当url中有父文件夹相对引用时，它对我不起作用。 例如,url(. . / . . /图片/ car.png)

因此，我稍微改变了Include方法，以便为每个正则匹配解析路径，允许相对路径，也可以选择将图像嵌入到css中。

我还更改了IF DEBUG检查BundleTable。EnableOptimizations而不是HttpContext.Current.IsDebuggingEnabled。

    public new Bundle Include(params string[] virtualPaths)
    {
        if (!BundleTable.EnableOptimizations)
        {
            // Debugging. Bundling will not occur so act normal and no one gets hurt. 
            base.Include(virtualPaths.ToArray());
            return this;
        }
        var bundlePaths = new List<string>();
        var server = HttpContext.Current.Server;
        var pattern = new Regex(@"url\s*\(\s*([""']?)([^:)]+)\1\s*\)", RegexOptions.IgnoreCase);
        foreach (var path in virtualPaths)
        {
            var contents = File.ReadAllText(server.MapPath(path));
            var matches = pattern.Matches(contents);
            // Ignore the file if no matches
            if (matches.Count == 0)
            {
                bundlePaths.Add(path);
                continue;
            }
            var bundlePath = (System.IO.Path.GetDirectoryName(path) ?? string.Empty).Replace(@"\", "/") + "/";
            var bundleUrlPath = VirtualPathUtility.ToAbsolute(bundlePath);
            var bundleFilePath = string.Format("{0}{1}.bundle{2}",
                                               bundlePath,
                                               System.IO.Path.GetFileNameWithoutExtension(path),
                                               System.IO.Path.GetExtension(path));
            // Transform the url (works with relative path to parent folder "../")
            contents = pattern.Replace(contents, m =>
            {
                var relativeUrl = m.Groups[2].Value;
                var urlReplace = GetUrlReplace(bundleUrlPath, relativeUrl, server);
                return string.Format("url({0}{1}{0})", m.Groups[1].Value, urlReplace);
            });
            File.WriteAllText(server.MapPath(bundleFilePath), contents);
            bundlePaths.Add(bundleFilePath);
        }
        base.Include(bundlePaths.ToArray());
        return this;
    }


    private string GetUrlReplace(string bundleUrlPath, string relativeUrl, HttpServerUtility server)
    {
        // Return the absolute uri
        Uri baseUri = new Uri("http://dummy.org");
        var absoluteUrl = new Uri(new Uri(baseUri, bundleUrlPath), relativeUrl).AbsolutePath;
        var localPath = server.MapPath(absoluteUrl);
        if (IsEmbedEnabled && File.Exists(localPath))
        {
            var fi = new FileInfo(localPath);
            if (fi.Length < 0x4000)
            {
                // Embed the image in uri
                string contentType = GetContentType(fi.Extension);
                if (null != contentType)
                {
                    var base64 = Convert.ToBase64String(File.ReadAllBytes(localPath));
                    // Return the serialized image
                    return string.Format("data:{0};base64,{1}", contentType, base64);
                }
            }
        }
        // Return the absolute uri 
        return absoluteUrl;
    }

希望能有所帮助，敬礼。

更好的是(IMHO)实现一个自定义Bundle来修复图像路径。我为我的应用程序写了一个。

using System;
using System.Collections.Generic;
using IO = System.IO;
using System.Linq;
using System.Text.RegularExpressions;
using System.Web;
using System.Web.Optimization;

...

public class StyleImagePathBundle : Bundle
{
    public StyleImagePathBundle(string virtualPath)
        : base(virtualPath, new IBundleTransform[1]
      {
        (IBundleTransform) new CssMinify()
      })
    {
    }

    public StyleImagePathBundle(string virtualPath, string cdnPath)
        : base(virtualPath, cdnPath, new IBundleTransform[1]
      {
        (IBundleTransform) new CssMinify()
      })
    {
    }

    public new Bundle Include(params string[] virtualPaths)
    {
        if (HttpContext.Current.IsDebuggingEnabled)
        {
            // Debugging. Bundling will not occur so act normal and no one gets hurt.
            base.Include(virtualPaths.ToArray());
            return this;
        }

        // In production mode so CSS will be bundled. Correct image paths.
        var bundlePaths = new List<string>();
        var svr = HttpContext.Current.Server;
        foreach (var path in virtualPaths)
        {
            var pattern = new Regex(@"url\s*\(\s*([""']?)([^:)]+)\1\s*\)", RegexOptions.IgnoreCase);
            var contents = IO.File.ReadAllText(svr.MapPath(path));
            if(!pattern.IsMatch(contents))
            {
                bundlePaths.Add(path);
                continue;
            }


            var bundlePath = (IO.Path.GetDirectoryName(path) ?? string.Empty).Replace(@"\", "/") + "/";
            var bundleUrlPath = VirtualPathUtility.ToAbsolute(bundlePath);
            var bundleFilePath = String.Format("{0}{1}.bundle{2}",
                                               bundlePath,
                                               IO.Path.GetFileNameWithoutExtension(path),
                                               IO.Path.GetExtension(path));
            contents = pattern.Replace(contents, "url($1" + bundleUrlPath + "$2$1)");
            IO.File.WriteAllText(svr.MapPath(bundleFilePath), contents);
            bundlePaths.Add(bundleFilePath);
        }
        base.Include(bundlePaths.ToArray());
        return this;
    }

}

要使用它，请执行:

bundles.Add(new StyleImagePathBundle("~/bundles/css").Include(
  "~/This/Is/Some/Folder/Path/layout.css"));

.．.而不是……

bundles.Add(new StyleBundle("~/bundles/css").Include(
  "~/This/Is/Some/Folder/Path/layout.css"));

What it does is (when not in debug mode) looks for url(<something>) and replaces it with url(<absolute\path\to\something>). I wrote the thing about 10 seconds ago so it might need a little tweaking. I've taken into account fully-qualified URLs and base64 DataURIs by making sure there's no colons (:) in the URL path. In our environment, images normally reside in the same folder as their css files, but I've tested it with both parent folders (url(../someFile.png)) and child folders (url(someFolder/someFile.png).

只需要记住在一个包中修复多个CSS包含，例如:

bundles.Add(new StyleBundle("~/Content/styles/jquery-ui")
    .Include("~/Content/css/path1/somestyle1.css", "~/Content/css/path2/somestyle2.css"));

你不能只添加新的CssRewriteUrlTransform()到末尾，因为你可以用一个CSS文件的方法不支持它，所以你必须多次使用Include:

bundles.Add(new StyleBundle("~/Content/styles/jquery-ui")
    .Include("~/Content/css/path1/somestyle1.css", new CssRewriteUrlTransform())
    .Include("~/Content/css/path2/somestyle2.css", new CssRewriteUrlTransform()));

CssRewriteUrlTransform修复了我的问题。 如果你的代码仍然没有加载图像后使用CssRewriteUrlTransform，那么 更改你的CSS文件名:

.Include("~/Content/jquery/jquery-ui-1.10.3.custom.css", new CssRewriteUrlTransform())

To:

.Include("~/Content/jquery/jquery-ui.css", new CssRewriteUrlTransform())

(点)在url中不被识别。