I need to manually clear the cache on a SqlDataSource with caching enabled. I've tried setting EnableChaching = false, and CacheDuration = 0 (as well as = 1) and none seem to expire the content already in the cache - although they do seem to prevent new SELECTs from being cached.
How do I manually expire that cache?
Thanks.
I just started researching this today and came across this post, this look likes the best solution:
Simple way to invalidate SqlDataSource cache programmatically
<asp:SqlDataSource ID="x" EnableCaching="True" CacheKeyDependency="MyCacheDependency"/>
protected void Page_Load(object sender, EventArgs e)
{ // Or somewhere else before the DataBind() takes place
if (!IsPostBack)
{
//prime initial cache key value if never initialized
if (Cache["MyCacheDependency"] == null)
{
Cache["MyCacheDependency"] = DateTime.Now;
}
}
}
// Evict cache items with an update in dependent cache:
Cache["MyCacheDependency"] = DateTime.Now;
I had the same problem, although the "EnableCaching=false".
Under heavy load, I saw some caching happening. This caching caused me to miss much data.
I found it might be related to caching.
So I use Response.Cache.SetCacheability(HttpCacheability.NoCache); on my code behind. It seems to work and after 12 hours I don't have the least missing data.
Disabling caching (EnableCaching = false) and then forcing a new select (SqlDataSourceInstance.Select(new DataSourceSelectArguments())) before re-enabling caching clears the particular combination of CommandText and CommandParameters being selected, so it's a start.
It still retains the cache of the other combinations of queries executed by the SqlDataSource, though, so this doesn't solve all of the problem.
Make sure your CacheExpirationPolicy is Absolute. Use a non-zero CacheDuration (0 means infinite cache duration).
