ASP.NET MVC捆绑缓存. (检测css文件更改)(内部行为)

捆绑文件名是捆绑内容的哈希值,用于确保任何捆绑文件被修改时URL改变.软件包的虚拟路径用作缓存密钥.

图书馆的相关代码(注意这个稍微过时,但我认为逻辑仍然是一样的)：

internal BundleResponse GetBundleResponse(BundleContext context)
{
    // check to see if the bundle response is in the cache
    BundleResponse bundleResponse = Bundle.CacheLookup(context);
    if (bundleResponse == null || context.EnableInstrumentation)
    {
        // if not,generate the bundle response and cache it
        bundleResponse = this.GenerateBundleResponse(context);
        if (context.UseServerCache)
        {
            this.UpdateCache(context,bundleResponse);
        }
    }
    return bundleResponse;
}

private void UpdateCache(BundleContext context,BundleResponse response)
{
    if (context.UseServerCache)
    {
        // create a list of all the file paths in the bundle
            List<string> list = new List<string>();
        list.AddRange(
            from f in response.Files
            select f.FullName);
        list.AddRange(context.CacheDependencyDirectories);
        string cacheKey = Bundle.GetCacheKey(context.BundleVirtualPath);
        // insert the response into the cache with a cache dependency that monitors
        // the bundle files for changes
        context.HttpContext.Cache.Insert(cacheKey,response,new CacheDependency(list.ToArray()));
        context.HttpContext.Response.AddCacheItemDependency(cacheKey);
        this._cacheKeys.Add(cacheKey);
    }
}

最后,对于旧的bundle URL,我想你会发现它们是从浏览器缓存返回的,或者实际上返回最新版本的捆绑包,因为捆绑路径没有改变,只有版本查询字符串.