asp.net动态压缩合并css、js

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Text;
using System.Text.RegularExpressions;
using Microsoft.Ajax.Utilities;
using System.Configuration;
using System.IO;
using System.IO.Compression;

namespace mvcDemo.Controllers
{
    public class FileBundlerController : Controller
    {
        private static readonly string staticFileRoot = ConfigurationManager.AppSettings["staticFileRoot"];
        private static readonly string staticFileCatchRoot = ConfigurationManager.AppSettings["staticFileCatchRoot"];
        //
        // GET: /FileBundler/
        // url格式：host/Controller?[type=类型(js、css)href=文件地址（以;分隔）](可以有多个目录)&t=版本
        // demoUrl: http://localhost:4122/FileBundler?type=js&href=js.;admin_common,content_addtop.min&t=2010-10-29_19:16:18
        public string Index()
        {
            string urlQuery = Request.Url.Query;
            if (string.IsNullOrWhiteSpace(urlQuery))
            {
                return "参数错误！！！";
            }
            string[] paramList = urlQuery.Substring(1).Split('&');
            /**
             * 必须是三个参数type、href、t
             * **/
            if (paramList.Length != 3)
            {
                return "参数错误！！！";
            }
            Dictionary<string, string> urlParam = new Dictionary<string, string>();
            foreach (string item in paramList)
            {
                string[] paramItem = item.Split('=');
                /**
                 * 各参数以=分隔
                 * **/
                if (paramItem.Length != 2)
                {
                    return "参数错误！！！";
                }
                /**
                 * 参数不能重复
                 * **/
                if (urlParam.ContainsKey(paramItem[0]))
                {
                    return "参数错误！！！";
                }
                urlParam.Add(paramItem[0], paramItem[1]);
            }
            /**
             * 三个参数必须是固定的
             * **/
            if (!urlParam.ContainsKey("type") || !urlParam.ContainsKey("href") || !urlParam.ContainsKey("t"))
            {
                return "参数错误！！！";
            }
            string fileType = urlParam["type"];
            string href = urlParam["href"];
            /**
             * 不参包含/或\（文件名里不能有/或\）
             * **/
            if (href.Contains("/") || href.Contains(@"\"))
            {
                return "参数错误！！！";
            }
            string fileName = string.Format("{0}{1}.{2}", staticFileCatchRoot, href, fileType);
            /**
             * 类型必须为js或css
             * **/
            if (fileType.Equals("js"))
            {
                Response.ContentType = "text/javascript";
            }
            else if (fileType.Equals("css"))
            {
                Response.ContentType = "text/css";
            }
            else
            {
                return "参数错误！！！";
            }
            DateTime versionTime = DateTime.MinValue;
            try 
	        {	        
		        versionTime = DateTime.Parse(urlParam["t"].Replace("_", " "));
	        }
	        catch{}
            /**
             * 时间转换出错会执行这里
             * **/
            if(versionTime == DateTime.MinValue)
            {
                return "参数错误！！！";
            }
            System.IO.FileInfo fileInfo = null;
            if (System.IO.File.Exists(fileName))
            {
                fileInfo = new FileInfo(fileName);
                if (fileInfo.CreationTime == versionTime)
                {
                    return System.IO.File.ReadAllText(fileName);
                }
            }
            /**
             * 多个目录以;分隔
             * **/
            string[] hrefParam = href.Split(';');
            int hrefParamLen = hrefParam.Length;
            /**
             * 目录和文件是以;分隔，所以目录+文件的个数是2的倍数
             * **/
            if (hrefParamLen % 2 != 0)
            {
                return "参数错误！！！";
            }
            StringBuilder content = new StringBuilder();
            for (int i = 0; i < hrefParamLen; i++)
            {
                string folder = hrefParam[i].Replace(".","/");
                folder = string.Format("{0}{1}", staticFileRoot, folder);
                string[] files = hrefParam[++i].Split(',');
                foreach (string item in files)
                {
                    string _fileName = string.Format("{0}{1}.{2}", folder, item, fileType);
                    /**
                     * 文件不存在，输出错误信息
                     * **/
                    if (!System.IO.File.Exists(_fileName))
                    {
                        return "文件未找到！！！";
                    }
                    content.Append(System.IO.File.ReadAllText(_fileName));
                }
            }
            string fileContent = Minify(content.ToString(), string.Format(".{0}",fileType));
            System.IO.File.WriteAllText(fileName, fileContent);
            fileInfo = new FileInfo(fileName);
            fileInfo.CreationTime = versionTime;
            return fileContent;
        }

        private static string Minify(string content, string extension)
        {
            Minifier cruncher = new Minifier();
            if (extension == ".js")
            {
                CodeSettings settings = new CodeSettings
                {
                    EvalTreatment = EvalTreatment.MakeImmediateSafe,
                    MinifyCode = true,
                    RemoveUnneededCode = true,
                    LocalRenaming = LocalRenaming.CrunchAll,
                    RemoveFunctionExpressionNames = true
                };
                return cruncher.MinifyJavaScript(content, settings);
            }
            else if (extension == ".css")
            {
                return cruncher.MinifyStyleSheet(content);
            }

            return content;
        }
    }
}

　　MVC4引入：WebGrease.dll

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