Asp.Net Framework项目优化前端文件引用

背景：公司一个老项目，前端引用都是直接引用文件，这样导致每次发布都存在用户浏览器缓存问题，常见做法是找到每个引用前端文件处加?version，但是太麻烦了

解决思路：

1.找到所有前端文件
2.jenkins每次编译更新版本号，把新的版本号拼接到前端文件引用处

实现：

• 1.首先在扩展类里面扩展以下方法，用来动态处理版本变更的拼接

/// <summary>
/// 处理js
/// </summary>
/// <param name="html"></param>
/// <param name="contentPath"></param>
/// <returns></returns>
public static MvcHtmlString Script(this HtmlHelper html, string contentPath)
{
    return VersionContent(html, "<script src=\"{0}\" type=\"text/javascript\"></script>", contentPath);
}

/// <summary>
/// 处理css
/// </summary>
/// <param name="html"></param>
/// <param name="contentPath"></param>
/// <returns></returns>
public static MvcHtmlString Style(this HtmlHelper html, string contentPath)
{
    return VersionContent(html, "<link href=\"{0}\" rel=\"stylesheet\" type=\"text/css\">", contentPath);
}

/// <summary>
/// 加上版本
/// </summary>
/// <param name="html"></param>
/// <param name="template"></param>
/// <param name="contentPath"></param>
private static MvcHtmlString VersionContent(this HtmlHelper html, string template, string contentPath)
{

    string v = "";
    try
    {
        var versionPath = ConfigHelper.GetConfigString("VersionPath");
        var version = FileUtility.GetContent(versionPath);
        var httpContenxt = html.ViewContext.HttpContext;
        contentPath = UrlHelper.GenerateContentUrl(contentPath, httpContenxt) + "?v=" + version;
        v = string.Format(template, contentPath);
    }
    catch (Exception ex)
    {
        ExceptionlessManager.WriteExceptionLog("HtmlHelperExtension", $"初始化版本号异常：{ex}", null, AllProjectsKey.ProductError.ToString());
    }
    return MvcHtmlString.Create(v);
}

• 2.一次性替换所有静态文件的引用方式

引用Less组件，参考文档：Less.Html

static void Main(string[] args)
{
  //静态文件包地址，比如MVC项目中Views文件夹
  var InitStaticResourcesPath = ConfigurationManager.AppSettings["InitStaticResourcesPath"];
  if (!string.IsNullOrEmpty(InitStaticResourcesPath))
  {
      System.IO.DirectoryInfo dir = new System.IO.DirectoryInfo(InitStaticResourcesPath);
      var files = dir.GetFiles(".", System.IO.SearchOption.AllDirectories);
      var aspxs = files.ToList().Where(w => w.FullName.Contains("aspx"));
      var cshtmls = files.ToList().Where(w => w.FullName.Contains("cshtml"));
      foreach (var aspx in aspxs)
      {
          var html = FileUtility.GetContent(aspx.FullName);
          Document document = HtmlParser.Parse(html);
          var q = Selector.Bind(document);
          q("html").before("<%@ Import Namespace=\"PDSys.Domain.Models.Extentions\" %>");
          q("html").before("\r\n");
          var heads = q("head");
          var links = q("link");
          var scripts = q("script");
          foreach (var item in links)
          {
              var href = item.attributes.Where(w => w.name == "href").FirstOrDefault();
              if (href != null)
              {
                  var start = href.ToString().IndexOf("\"");
                  var end = href.ToString().IndexOf(".css");
                  if (end > 0)
                  {
                      var content = href.ToString().Substring(start, end);
                      q(item).before($"<%=Html.Style({content}) %>");
                      q(item).remove();
                  }
              }
          }
          foreach (var item in scripts)
          {
              var src = item.attributes.Where(w => w.name == "src").FirstOrDefault();
              if (src != null)
              {
                  var start = src.ToString().IndexOf("\"");
                  var end = src.ToString().IndexOf(".js");
                  if (end > 0)
                  {
                      var content = src.ToString().Substring(start, end);
                      q(item).before($"<%=Html.Script({content}) %>");
                      q(item).remove();
                  }
              }
          }
          html = document.ToString();
          FileUtility.SetContent(aspx.FullName, html);
          Console.WriteLine($"{aspx.FullName}处理完成");
      }
      foreach (var cshtml in cshtmls)
      {
          var html = FileUtility.GetContent(cshtml.FullName);
          Document document = HtmlParser.Parse(html);
          var q = Selector.Bind(document);
          q("html").before("@using PDSys.Domain.Models.Extentions");
          q("html").before("\r\n");
          var heads = q("head");
          var links = q("link");
          var scripts = q("script");
          foreach (var item in links)
          {
              var href = item.attributes.Where(w => w.name == "href").FirstOrDefault();
              if (href != null)
              {
                  var start = href.ToString().IndexOf("\"");
                  var end = href.ToString().IndexOf(".css");
                  if (end > 0)
                  {
                      var content = href.ToString().Substring(start, end);
                      q(item).before($"@Html.Style({content})");
                      q(item).remove();
                  }
              }
          }
          foreach (var item in scripts)
          {
              var src = item.attributes.Where(w => w.name == "src").FirstOrDefault();
              if (src != null)
              {
                  var start = src.ToString().IndexOf("\"");
                  var end = src.ToString().IndexOf(".js");
                  if (end > 0)
                  {
                      var content = src.ToString().Substring(start, end);
                      q(item).before($"@Html.Script({content})");
                      q(item).remove();
                  }
              }
          }
          html = document.ToString();
          FileUtility.SetContent(cshtml.FullName, html);
          Console.WriteLine($"{cshtml.FullName}处理完成");
      }
      Console.WriteLine("InitStaticResourcesPath全部处理完成");
      Console.ReadKey();
      return;
  }
}