/// <summary>
/// Methoda zwraca filtr
/// </summary>
/// <typeparam name="T">Typ filtru</typeparam>
/// <param name="filterKey">Klucz do zapisanego filtra w sesji</param>
/// <param name="settingsKey">Klucz do zapisanych stawień w sesji</param>
/// <param name="page">Strona</param>
/// <param name="sortExpression">Wyrażenie sortowania</param>
/// <param name="accending">rosnące?</param>
/// <returns></returns>
private T PageSettingsOrder <T>(FilterSettingsKey filterKey, PageSettingsKey settingsKey, ref int?page, ref string sortExpression, ref bool?accending)
{
var filter = default(T);
// Pobranie aktualnych filtrów z sesji
if (Session != null)
{
filter = (T)Session[filterKey.ToString()];
}
if (filter == null)
{
filter = Activator.CreateInstance <T>();
}
if (Session != null)
{
Session[filterKey.ToString()] = filter;
PageSettings.RemoveFromSessionExcept(settingsKey);
FilterSettings.RemoveFromSessionExcept(filterKey);
var pageSettings = PageSettings.GetFromSession(settingsKey);
if (pageSettings != null)
{
if (!page.HasValue)
{
page = pageSettings.Page;
}
if (!accending.HasValue)
{
accending = pageSettings.Accending;
}
if (string.IsNullOrEmpty(sortExpression))
{
sortExpression = pageSettings.SortExpression;
}
}
else
{
pageSettings = new PageSettings();
}
pageSettings.Page = page ?? 1;
pageSettings.Accending = !accending.HasValue || accending.Value;
pageSettings.SortExpression = string.IsNullOrEmpty(sortExpression) ? "Id" : sortExpression;
Session[settingsKey.ToString()] = pageSettings;
}
return(filter);
}
/// <summary>
/// Usuwana obiekty filtrów z sesji za wyjątkiem zadanego klucza
/// </summary>
/// <param name="exception">Wyjątek - klucz, który nie zostanie usunięty z sesji</param>
public static void RemoveFromSessionExcept(FilterSettingsKey exception)
{
if (System.Web.HttpContext.Current != null && System.Web.HttpContext.Current.Session != null)
{
string[] namesToRemove = Enum.GetNames(typeof(FilterSettingsKey)).Except(new string[] { exception.ToString() }).ToArray();
foreach (string name in namesToRemove)
{
if (System.Web.HttpContext.Current.Session[name] != null)
{
System.Web.HttpContext.Current.Session[name] = null;
System.Web.HttpContext.Current.Session.Remove(name);
}
}
}
}