Asp.net mvc 4 如何使用ASP.NETMVC4在发布模式下捆绑更少的文件？

我尝试在我的web项目中使用更少的文件，并将MVC4绑定功能调用到dotLess库中，将更少的文件转换为CSS，然后缩小结果并将其提供给浏览器

我在上找到了一个例子（标题为LESS、CoffeeScript、SCSS、Sass捆绑）。这给了我一个

lesstrasform

类，看起来像这样：

public class LessTransform : IBundleTransform
{
    public void Process(BundleContext context, BundleResponse response)
    {
        response.Content = dotless.Core.Less.Parse(response.Content);
        response.ContentType = "text/css";
    }
}

我的

BundleConfig

课程中的这一行：

bundles.Add(new Bundle(
    "~/Content/lessTest", 
    new LessTransform(), 
    new CssMinify()).Include("~/Content/less/test.less"));

最后，在我的_Layout.cshtml中，

中有以下一行：

如果站点处于调试模式，则会呈现到浏览器：

<link href="/Content/less/test.less" rel="stylesheet"/>

将应用.less文件中的规则，并按照该链接显示less已正确转换为CSS

但是，如果我将站点置于发布模式，则会呈现以下内容：

<link href="/Content/less?v=lEs-HID6XUz3s2qkJ35Lvnwwq677wTaIiry6fuX8gz01" rel="stylesheet"/>

不应用.less文件中的规则，因为以下链接会导致来自IIS的404错误

---

所以看起来捆绑销售出现了一些问题。如何使其在发布模式下工作，或者如何找出到底出了什么问题？

看起来很有效-我更改了

过程

方法以迭代文件集合：

public void Process(BundleContext context, BundleResponse response)
{
    var builder = new StringBuilder();
    foreach (var fileInfo in response.Files)
    {
        using (var reader = fileInfo.OpenText())
        {
            builder.Append(dotless.Core.Less.Parse(reader.ReadToEnd()));
        }
    }

    response.Content = builder.ToString();
    response.ContentType = "text/css";
}

---

如果更少的文件中有任何

@import

语句，则会中断。不过，在这种情况下，您必须做更多的工作，例如：

编辑于2019年12月8日，这不再是可接受的问题答案，因为多年来ASP.NET中出现了突破性的变化。下面还有其他答案修改了此代码或提供了其他答案来帮助您解决此问题。

似乎无点引擎需要知道当前处理的捆绑文件的路径才能解析@import路径。如果运行上面的流程代码，则当正在解析的.Less文件导入了其他Less文件时，dotless.Core.Less.Parse（）的结果将是空字符串

Ben Foster在这里的回答将通过首先读取导入的文件来解决这一问题：

按如下方式更改LessTransform文件：

public class LessTransform : IBundleTransform
{
    public void Process(BundleContext context, BundleResponse bundle)
    {
        if (context == null)
        {
            throw new ArgumentNullException("context");
        }

        if (bundle == null)
        {
            throw new ArgumentNullException("bundle");
        }

        context.HttpContext.Response.Cache.SetLastModifiedFromFileDependencies();

        var lessParser = new Parser();
        ILessEngine lessEngine = CreateLessEngine(lessParser);

        var content = new StringBuilder(bundle.Content.Length);

        var bundleFiles = new List<FileInfo>();

        foreach (var bundleFile in bundle.Files)
        {
            bundleFiles.Add(bundleFile);

            SetCurrentFilePath(lessParser, bundleFile.FullName);
            string source = File.ReadAllText(bundleFile.FullName);
            content.Append(lessEngine.TransformToCss(source, bundleFile.FullName));
            content.AppendLine();

            bundleFiles.AddRange(GetFileDependencies(lessParser));
        }

        if (BundleTable.EnableOptimizations)
        {
            // include imports in bundle files to register cache dependencies
            bundle.Files = bundleFiles.Distinct();
        }

        bundle.ContentType = "text/css";
        bundle.Content = content.ToString();
    }

    /// <summary>
    /// Creates an instance of LESS engine.
    /// </summary>
    /// <param name="lessParser">The LESS parser.</param>
    private ILessEngine CreateLessEngine(Parser lessParser)
    {
        var logger = new AspNetTraceLogger(LogLevel.Debug, new Http());
        return new LessEngine(lessParser, logger, true, false);
    }

    /// <summary>
    /// Gets the file dependencies (@imports) of the LESS file being parsed.
    /// </summary>
    /// <param name="lessParser">The LESS parser.</param>
    /// <returns>An array of file references to the dependent file references.</returns>
    private IEnumerable<FileInfo> GetFileDependencies(Parser lessParser)
    {
        IPathResolver pathResolver = GetPathResolver(lessParser);

        foreach (var importPath in lessParser.Importer.Imports)
        {
            yield return new FileInfo(pathResolver.GetFullPath(importPath));
        }

        lessParser.Importer.Imports.Clear();
    }

    /// <summary>
    /// Returns an <see cref="IPathResolver"/> instance used by the specified LESS lessParser.
    /// </summary>
    /// <param name="lessParser">The LESS parser.</param>
    private IPathResolver GetPathResolver(Parser lessParser)
    {
        var importer = lessParser.Importer as Importer;
        var fileReader = importer.FileReader as FileReader;

        return fileReader.PathResolver;
    }

    /// <summary>
    /// Informs the LESS parser about the path to the currently processed file. 
    /// This is done by using a custom <see cref="IPathResolver"/> implementation.
    /// </summary>
    /// <param name="lessParser">The LESS parser.</param>
    /// <param name="currentFilePath">The path to the currently processed file.</param>
    private void SetCurrentFilePath(Parser lessParser, string currentFilePath)
    {
        var importer = lessParser.Importer as Importer;

        if (importer == null)
            throw new InvalidOperationException("Unexpected dotless importer type.");

        var fileReader = importer.FileReader as FileReader;

        if (fileReader == null || !(fileReader.PathResolver is ImportedFilePathResolver))
        {
            fileReader = new FileReader(new ImportedFilePathResolver(currentFilePath));
            importer.FileReader = fileReader;
        }
    }
}

public class ImportedFilePathResolver : IPathResolver
{
    private string currentFileDirectory;
    private string currentFilePath;

    public ImportedFilePathResolver(string currentFilePath)
    {
        if (string.IsNullOrEmpty(currentFilePath))
        {
            throw new ArgumentNullException("currentFilePath");
        }

        CurrentFilePath = currentFilePath;
    }

    /// <summary>
    /// Gets or sets the path to the currently processed file.
    /// </summary>
    public string CurrentFilePath
    {
        get { return currentFilePath; }
        set
        {
            currentFilePath = value;
            currentFileDirectory = Path.GetDirectoryName(value);
        }
    }

    /// <summary>
    /// Returns the absolute path for the specified improted file path.
    /// </summary>
    /// <param name="filePath">The imported file path.</param>
    public string GetFullPath(string filePath)
    {
        if (filePath.StartsWith("~"))
        {
            filePath = VirtualPathUtility.ToAbsolute(filePath);
        }

        if (filePath.StartsWith("/"))
        {
            filePath = HostingEnvironment.MapPath(filePath);
        }
        else if (!Path.IsPathRooted(filePath))
        {
            filePath = Path.GetFullPath(Path.Combine(currentFileDirectory, filePath));
        }

        return filePath;
    }
}

公共类LessTransform:IBundleTransform
{
公共作废进程（BundleContext、BundleResponse bundle）
{
if（上下文==null）
{
抛出新的ArgumentNullException（“上下文”）；
}
if（bundle==null）
{
抛出新的ArgumentNullException（“bundle”）；
}
context.HttpContext.Response.Cache.SetLastModifiedFromFileDependencies（）；
var lessParser=new Parser（）；
IlesEngine-ReduceEngine=CreateReduceEngine（lessParser）；
var content=新的StringBuilder（bundle.content.Length）；
var bundleFiles=新列表（）；
foreach（bundle.Files中的var bundleFile）
{
bundleFile.Add（bundleFile）；
SetCurrentFilePath（lessParser，bundleFile.FullName）；
string source=File.ReadAllText（bundleFile.FullName）；
content.Append（reducegine.TransformToCss（source，bundleFile.FullName））；
content.AppendLine（）；
AddRange（GetFileDependencies（lessParser））；
}
if（BundleTable.EnableOptimizations）
{
//在捆绑文件中包含导入以注册缓存依赖项
bundle.Files=bundleFiles.Distinct（）；
}
bundle.ContentType=“text/css”；
bundle.Content=Content.ToString（）；
}
/// 
///创建LESS引擎的实例。
/// 
///更少的解析器。
专用ILessEngine CreateLessEngine（解析器lessParser）
{
var logger=new AspNetTraceLogger（LogLevel.Debug，new Http（））；
返回新引擎（lessParser、logger、true、false）；
}
/// 
///获取正在分析的较少文件的文件依赖项（@imports）。
/// 
///更少的解析器。
///指向从属文件引用的文件引用数组。
私有IEnumerable GetFileDependencies（解析器lessParser）
{
IPathResolver路径解析器=GetPathResolver（lessParser）；
foreach（lessParser.Importer.Imports中的var importPath）
{
产生并返回新的文件信息（pathResolver.GetFullPath（importPath））；
}
lessParser.Importer.Imports.Clear（）；
}
/// 
///返回指定的lessParser使用的实例。
/// 
///更少的解析器。
专用IPathResolver GetPathResolver（解析器lessParser）
{
var进口商=作为进口商的lessParser.进口商；
var fileReader=importer.fileReader作为fileReader；
返回fileReader.PathResolver；
}
/// 
///通知LESS解析器当前处理文件的路径。
///这是通过使用自定义实现来完成的。
/// 
///更少的解析器。
///当前处理的文件的路径。
私有void SetCurrentFilePath（解析器lessParser，字符串currentFilePath）
{
var进口商=作为进口商的lessParser.进口商；
如果（导入器==null）
抛出新的InvalidOperationException（“意外的无点导入器类型”）；
var fileReader=importer.fileReader作为fileReader；
如果（fileReader==null | |！（fileReader.PathResolver是ImportedFilePathResolver））
{
fileReader=新的fileReader（新导入的FilePathResolver（currentFilePath））；
importer.FileReader=FileReader；
}
}
}
公共类导入的FilePathResolver:IPathResolver
{
私有字符串currentFileDirectory；
私有字符串currentFilePath；
公共导入的FilePathResolver（字符串currentFilePath）
{
if（string.IsNullOrEmpty（currentFilePath））
{
抛出新ArgumentNullException（“currentFilePath”）；
}
CurrentFilePath=CurrentFilePath；
}
/// 
///获取或设置当前处理的文件的路径。
/// 
公共字符串CurrentFilePath
{
获取{返回currentFilePath；
public class LessTransform : IBundleTransform
{
    public void Process(BundleContext context, BundleResponse bundle)
    {
        if (context == null)
        {
            throw new ArgumentNullException("context");
        }

        if (bundle == null)
        {
            throw new ArgumentNullException("bundle");
        }

        context.HttpContext.Response.Cache.SetLastModifiedFromFileDependencies();

        var lessParser = new Parser();
        ILessEngine lessEngine = CreateLessEngine(lessParser);

        var content = new StringBuilder(bundle.Content.Length);

        var bundleFiles = new List<FileInfo>();

        foreach (var bundleFile in bundle.Files)
        {
            bundleFiles.Add(bundleFile);

            SetCurrentFilePath(lessParser, bundleFile.FullName);
            string source = File.ReadAllText(bundleFile.FullName);
            content.Append(lessEngine.TransformToCss(source, bundleFile.FullName));
            content.AppendLine();

            bundleFiles.AddRange(GetFileDependencies(lessParser));
        }

        if (BundleTable.EnableOptimizations)
        {
            // include imports in bundle files to register cache dependencies
            bundle.Files = bundleFiles.Distinct();
        }

        bundle.ContentType = "text/css";
        bundle.Content = content.ToString();
    }

    /// <summary>
    /// Creates an instance of LESS engine.
    /// </summary>
    /// <param name="lessParser">The LESS parser.</param>
    private ILessEngine CreateLessEngine(Parser lessParser)
    {
        var logger = new AspNetTraceLogger(LogLevel.Debug, new Http());
        return new LessEngine(lessParser, logger, true, false);
    }

    /// <summary>
    /// Gets the file dependencies (@imports) of the LESS file being parsed.
    /// </summary>
    /// <param name="lessParser">The LESS parser.</param>
    /// <returns>An array of file references to the dependent file references.</returns>
    private IEnumerable<FileInfo> GetFileDependencies(Parser lessParser)
    {
        IPathResolver pathResolver = GetPathResolver(lessParser);

        foreach (var importPath in lessParser.Importer.Imports)
        {
            yield return new FileInfo(pathResolver.GetFullPath(importPath));
        }

        lessParser.Importer.Imports.Clear();
    }

    /// <summary>
    /// Returns an <see cref="IPathResolver"/> instance used by the specified LESS lessParser.
    /// </summary>
    /// <param name="lessParser">The LESS parser.</param>
    private IPathResolver GetPathResolver(Parser lessParser)
    {
        var importer = lessParser.Importer as Importer;
        var fileReader = importer.FileReader as FileReader;

        return fileReader.PathResolver;
    }

    /// <summary>
    /// Informs the LESS parser about the path to the currently processed file. 
    /// This is done by using a custom <see cref="IPathResolver"/> implementation.
    /// </summary>
    /// <param name="lessParser">The LESS parser.</param>
    /// <param name="currentFilePath">The path to the currently processed file.</param>
    private void SetCurrentFilePath(Parser lessParser, string currentFilePath)
    {
        var importer = lessParser.Importer as Importer;

        if (importer == null)
            throw new InvalidOperationException("Unexpected dotless importer type.");

        var fileReader = importer.FileReader as FileReader;

        if (fileReader == null || !(fileReader.PathResolver is ImportedFilePathResolver))
        {
            fileReader = new FileReader(new ImportedFilePathResolver(currentFilePath));
            importer.FileReader = fileReader;
        }
    }
}

public class ImportedFilePathResolver : IPathResolver
{
    private string currentFileDirectory;
    private string currentFilePath;

    public ImportedFilePathResolver(string currentFilePath)
    {
        if (string.IsNullOrEmpty(currentFilePath))
        {
            throw new ArgumentNullException("currentFilePath");
        }

        CurrentFilePath = currentFilePath;
    }

    /// <summary>
    /// Gets or sets the path to the currently processed file.
    /// </summary>
    public string CurrentFilePath
    {
        get { return currentFilePath; }
        set
        {
            currentFilePath = value;
            currentFileDirectory = Path.GetDirectoryName(value);
        }
    }

    /// <summary>
    /// Returns the absolute path for the specified improted file path.
    /// </summary>
    /// <param name="filePath">The imported file path.</param>
    public string GetFullPath(string filePath)
    {
        if (filePath.StartsWith("~"))
        {
            filePath = VirtualPathUtility.ToAbsolute(filePath);
        }

        if (filePath.StartsWith("/"))
        {
            filePath = HostingEnvironment.MapPath(filePath);
        }
        else if (!Path.IsPathRooted(filePath))
        {
            filePath = Path.GetFullPath(Path.Combine(currentFileDirectory, filePath));
        }

        return filePath;
    }
}

using System.Web.Optimization;

namespace MyProject
{
    public class LessBundle : Bundle
    {
        public LessBundle(string virtualPath) : base(virtualPath, new IBundleTransform[] {new LessTransform(), new CssMinify()})
        {

        }

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

        }
    }
}

bundles.Add(new LessBundle("~/Content/less").Include(
                 "~/Content/MyStyles.less"));

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Web.Hosting;
using System.Web.Optimization;
using dotless.Core;
using dotless.Core.Abstractions;
using dotless.Core.Importers;
using dotless.Core.Input;
using dotless.Core.Loggers;
using dotless.Core.Parser;

namespace Web.App_Start.Bundles
{
    public class LessTransform : IBundleTransform
    {
        public void Process(BundleContext context, BundleResponse bundle)
        {
            if (context == null)
            {
                throw new ArgumentNullException("context");
            }

            if (bundle == null)
            {
                throw new ArgumentNullException("bundle");
            }

            context.HttpContext.Response.Cache.SetLastModifiedFromFileDependencies();

            var lessParser = new Parser();
            ILessEngine lessEngine = CreateLessEngine(lessParser);

            var content = new StringBuilder(bundle.Content.Length);

            var bundleFiles = new List<BundleFile>();

            foreach (var bundleFile in bundle.Files)
            {
                bundleFiles.Add(bundleFile);

                var name = context.HttpContext.Server.MapPath(bundleFile.VirtualFile.VirtualPath);
                SetCurrentFilePath(lessParser, name);
                using (var stream = bundleFile.VirtualFile.Open())
                using (var reader = new StreamReader(stream))
                {
                    string source = reader.ReadToEnd();
                    content.Append(lessEngine.TransformToCss(source, name));
                    content.AppendLine();
                }

                bundleFiles.AddRange(GetFileDependencies(lessParser));
            }

            if (BundleTable.EnableOptimizations)
            {
                // include imports in bundle files to register cache dependencies
                bundle.Files = bundleFiles.Distinct();
            }

            bundle.ContentType = "text/css";
            bundle.Content = content.ToString();
        }

        /// <summary>
        /// Creates an instance of LESS engine.
        /// </summary>
        /// <param name="lessParser">The LESS parser.</param>
        private ILessEngine CreateLessEngine(Parser lessParser)
        {
            var logger = new AspNetTraceLogger(LogLevel.Debug, new Http());
            return new LessEngine(lessParser, logger, true, false);
        }

        /// <summary>
        /// Gets the file dependencies (@imports) of the LESS file being parsed.
        /// </summary>
        /// <param name="lessParser">The LESS parser.</param>
        /// <returns>An array of file references to the dependent file references.</returns>
        private IEnumerable<BundleFile> GetFileDependencies(Parser lessParser)
        {
            IPathResolver pathResolver = GetPathResolver(lessParser);

            foreach (var importPath in lessParser.Importer.Imports)
            {
                yield return
                    new BundleFile(pathResolver.GetFullPath(importPath),
                        HostingEnvironment.VirtualPathProvider.GetFile(importPath));
            }

            lessParser.Importer.Imports.Clear();
        }

        /// <summary>
        /// Returns an <see cref="IPathResolver"/> instance used by the specified LESS lessParser.
        /// </summary>
        /// <param name="lessParser">The LESS parser.</param>
        private IPathResolver GetPathResolver(Parser lessParser)
        {
            var importer = lessParser.Importer as Importer;
            var fileReader = importer.FileReader as FileReader;

            return fileReader.PathResolver;
        }

        /// <summary>
        /// Informs the LESS parser about the path to the currently processed file. 
        /// This is done by using a custom <see cref="IPathResolver"/> implementation.
        /// </summary>
        /// <param name="lessParser">The LESS parser.</param>
        /// <param name="currentFilePath">The path to the currently processed file.</param>
        private void SetCurrentFilePath(Parser lessParser, string currentFilePath)
        {
            var importer = lessParser.Importer as Importer;

            if (importer == null)
                throw new InvalidOperationException("Unexpected dotless importer type.");

            var fileReader = importer.FileReader as FileReader;

            if (fileReader == null || !(fileReader.PathResolver is ImportedFilePathResolver))
            {
                fileReader = new FileReader(new ImportedFilePathResolver(currentFilePath));
                importer.FileReader = fileReader;
            }
        }
    }
}

style = new StyleBundle("~/bundles/myLess-styles")
    .Include("~/Content/css/test.css", new CssRewriteUrlTransform());

bundles.Add(style);

@Styles.Render("~/bundles/myLess-styles")