Question

I know that i can use the VaryByParam attribute, but what it does is not exactly what i am aiming for.

What happens is that different versions of the page are cached based on the query string.

For example Page.aspx?ID=Tom has its own cached version and ID=Arnold has another. Now what i want to do is not to cache Arnold at all. I only want to cache the page when the query string is Tom.

Any ideas?

Answer 1

    <Extension()> _
    Public Sub CacheOutput(ByVal Page As Page, ByVal Minutes As Integer)
        Page.Response.Cache.SetExpires(Date.Now.AddMinutes(Minutes))
        Page.Response.Cache.SetCacheability(HttpCacheability.Server)
        Page.Response.Cache.SetValidUntilExpires(True)
    End Sub

This works. Note that any version of the page that has a querystring or a POST parameter will not be cached.