分享程序员开发的那些事...
更新时间：2023-09-01 08:48:10
我觉得我有一个快速和肮脏的解决方案。关键是要检查页头中的控件（例如在 preRender 相），找到 App_Themes文件文件夹，并让它们能动态（通过添加一些随机信息到查询字符串）。这很可能会告诉浏览器无效的文件的缓存版本。
在code：
保护无效Page_ preRender（对象发件人，EventArgs的发送）
{
HtmlLink链接= NULL; 的foreach（在Header.Controls控制C）
{
如果（c是HtmlLink）
{
链接= C作为HtmlLink; 如果（link.Href.IndexOf（App_Themes文件/，StringComparison.InvariantCultureIgnoreCase）GT; = 0＆放大器;＆放大器;
link.Href.EndsWith（CSS，StringComparison.InvariantCultureIgnoreCase））
{
link.Href + =的String.Format（，DateTime.Now.Ticks.ToString（）T = {0}？）;
}
}
}
}
输出：
＆LT;链接HREF =？App_Themes文件/ MyTheme的/ MyTheme.css T = 634310637798128189
类型=文/ CSS的rel =stylesheet属性/＆GT;
请注意，你需要有一个＆LT;头=服务器＆GT; 在你的页面的标记中声明，以便能够访问标题属性（否则将空）。
Possible Duplicate:
CSS in App_Theme folder gets Cached in Browser
I've seen "What is an elegant way to force browsers to reload cached CSS/JS files?" but the answer there uses PHP and it doesn't address the fact that the CSS is injected dynamically by an ASP.Net Theme.
I think I have a quick and dirty solution. The trick is to examine the controls within the page header (for example in the PreRender phase), find the links pointing to CSS-files under the App_Themes folder and make them dynamic (by adding some random information to the query-string). This will most likely tell the browser to invalidate the cached version of the file.
The code:
protected void Page_PreRender(object sender, EventArgs e)
{
HtmlLink link = null;
foreach (Control c in Header.Controls)
{
if (c is HtmlLink)
{
link = c as HtmlLink;
if (link.Href.IndexOf("App_Themes/", StringComparison.InvariantCultureIgnoreCase) >= 0 &&
link.Href.EndsWith(".css", StringComparison.InvariantCultureIgnoreCase))
{
link.Href += string.Format("?t={0}", DateTime.Now.Ticks.ToString());
}
}
}
}
The output:
<link href="App_Themes/MyTheme/MyTheme.css?t=634310637798128189"
type="text/css" rel="stylesheet" />
Note that you need to have a <head runat="server"> declared in your page's markup in order to be able to access the Header property (otherwise it will be null).