ASP.NET 4 Unleashed

Creating a Page Output Cache File Dependency

You can create a dependency between a cached page and a file (or set of files) on your hard drive. When the file is modified, the cached page is automatically dropped and regenerated with the next page request.

For example, the page in Listing 29.10 displays the contents of an XML file in a GridView. The page is cached until the XML file is modified (see Figure 29.5).

Figure 29.5. Caching a page with a file dependency.

Listing 29.10. OutputCacheFileDependency.aspx

The page in Listing 29.10 displays ...