public static void Configure <T>(this ISupportPaging grid,
IQueryable <T> query,
Func <int> totalRowCount,
int pageSize = 100)
{
ValidateInput(grid, query, totalRowCount, pageSize);
grid.PageSize = pageSize;
grid.OnGotoFirst = () => grid.SetDataSource(First, query);
grid.OnGotoPrev = () => grid.SetDataSource(Prev, query);
grid.OnGotoNext = () => grid.SetDataSource(Next, query);
grid.OnGotoLast = () => grid.SetDataSource(Last, query);
if (grid.TotalPages == null)
{
//local copy to avoid possible multiple enumerations.
var total = totalRowCount();
//
grid.TotalPages = () => CalculatePages(grid, total);
}
//Goes to the first page.
grid.SetDataSource(First, query);
grid.CleanUp = () =>
PagingCache.Remove(grid);//<= to avoid memory leaks.
if (grid.EndConfigure != null)
{
grid.EndConfigure();
}
grid.Configured = true;
}
public static void Search <T>(this ISupportPaging grid,
IQueryable <T> source,
Func <T, bool> criteria)
{
if (!grid.Configured)
{
throw new InvalidOperationException(
"You have to configure the grid first. Take a look at the configure method");
}
PagingCache.Invalidate();
grid.SetDataSource(First, source.Where(criteria).AsQueryable());
}
static IEnumerable <T> GetPage <T>(this ISupportPaging grid,
IQueryable <T> dataSource)
{
return(PagingCache.CacheAndReturn(grid, dataSource));
}
//
private static IEnumerable <T> InternalSearch <T>(this ISupportPaging grid, IQueryable <T> dataSource)
{
grid.CurrentPage = 0;
PagingCache.Invalidate();//maybe this is not the best way to go....
return(grid.GetPage(dataSource));
}