/// <summary>
/// Filter the query using context filters associated with specified keys.
/// </summary>
/// <typeparam name="T">The type of elements of the query.</typeparam>
/// <param name="query">The query to filter using context filters associated with specified keys.</param>
/// <param name="keys">
/// A variable-length parameters list containing keys associated to context filters to use to filter the
/// query.
/// </param>
/// <returns>The query filtered using context filters associated with specified keys.</returns>
public static IQueryable <T> Filter <T>(this IDbSet <T> query, params object[] keys) where T : class
{
var filterContext = QueryFilterManager.AddOrGetFilterContext(query.GetDbContext());
var filterHook = QueryFilterManager.EnableFilterById;
var sb = new StringBuilder();
if (keys != null)
{
foreach (var key in keys)
{
var filter = filterContext.GetFilter(key);
if (filter == null)
{
continue;
}
sb.Append(filter.UniqueKey);
sb.Append(";");
}
}
return(QueryFilterManager.HookFilter(query.AsNoFilter(), filterHook + sb));
}