assign out parameter totalRecords when using caching - asp.net

Question

I'm using asp.net Sqlmembership.GetAll() method ( paging overload ) . now I want to add a caching layer to cache results but there is problem with GetAll method's out parameter that returns the total number of records . how can I assign a value to totalRecords parameter when data are retrieved from cache ?

Answer 1

If my understanding is correct this little flow will help you to achieve your goal
This is a basic flow:
When you want to access the cached object, ask it to the cache provider
If the object is not null, then cast to the correct type and return the object from the cache (in this case, the list of users). End process
If the object is null then
Retrieve the object from its original source (using the GetAll methods)
Save the retrieved object to the cache
Return the retrieved object. End process
In any case, I would recommend you to work with a custom domain class instead of the MembershipUser class
This is a basic example:
public IEnumerable<DomainUser> GetDomainUsers()
{
var context = HttpContext.Current;
var cache = context.Cache;
var domainUsers = cache["domainUsers"] as IEnumerable<DomainUser>;
if (domainUsers == null)
{
domainUsers = Membership.GetAllUsers().OfType<MembershipUser>().Select(x => new DomainUser
{
Email = x.Email,
Username = x.UserName
});
cache.Insert(
"domainUsers", // cache key
domainUsers, // object to cache
null, // dependencies
DateTime.Now.AddMinutes(30), // absoulute expiration
Cache.NoSlidingExpiration, // slading expiration
CacheItemPriority.High, // cache item priority
null // callback called when the cache item is removed
);
context.Trace.Warn("Data retrieved from its original source");
}
else
{
context.Trace.Warn("Data retrieved from cache");
}
return domainUsers;
}