ДА, Я ДЕЛАЮ ЭТО. с помощью запроса Linq. :
Решение:
1. Я получаю данные об уведомлениях в listOfNotifications из базы данных.
2. Отдельные даты.
3. Создайте еще один бизнес-объект с именем: Notification_Date (вы можете увидеть B.E в коде)
4. В Notification_Date B.E составить Уведомления B.E.
5. Перебирайте dateOnly и присваивайте значения Notification_Date.
6. Связать с вложенным даталистом
List<Notifications> listofNotifications = new NotificationsDAL().GetAllNotifications();
if (listofNotifications != null)
{
dlNotifications.DataSource = GetNotificationWithDays(listofNotifications);
dlNotifications.DataBind();
}
public List<Notification_Date> GetNotificationWithDays(List<Notifications> listOfNotifications)
{
var datesOnly = (from i in listOfNotifications
select String.Format("{0:d/M/yyyy}", i.Datetime)).Distinct();
List<Notification_Date> tempOfNotifications = new List<Notification_Date>();
foreach (var onlyDate in datesOnly)
{
Notification_Date temp = new Notification_Date();
temp.date = DateTime.ParseExact(onlyDate.ToString(), "d/M/yyyy", CultureInfo.InvariantCulture);
temp.listOfNotifications = (from d in listOfNotifications //Filter Data.
where String.Format("{0:d/M/yyyy}", d.Datetime) == onlyDate
select d).ToList();
tempOfNotifications.Add(temp);
}
return tempOfNotifications;
}
public class Notifications
{
public long NID { get; set; }
public int Type { get; set; }
public DateTime Datetime { get; set; }
public long Agent_id { get; set; }
public string Agent_Name { get; set; }
public Boolean is_read { get; set; }
}
public class Notification_Date
{
public DateTime date { get; set; }
public List<Notifications> listOfNotifications { get; set; }
}
ПУНКТ НАРУЖНЫХ ДАННЫХ
protected void dlNotifications_ItemDataBound(object sender, DataListItemEventArgs e)
{
Label lblDay = (Label)e.Item.FindControl("lblDay");
string databaseDate = String.Format("{0:d/M/yyyy}", Convert.ToDateTime(lblDay.Text));
string nowDate = String.Format("{0:d/M/yyyy}", DateTime.Now);
TimeSpan timeSpan = DateTime.ParseExact(nowDate, "d/M/yyyy", CultureInfo.InvariantCulture) -
DateTime.ParseExact(databaseDate, "d/M/yyyy", CultureInfo.InvariantCulture); //Compare date.
if (databaseDate == nowDate)
{
lblDay.Text = "Today";
}
else if (timeSpan.Days == 1)
{
lblDay.Text = "Yesterday";
}
else
{
lblDay.Text = String.Format("{0:MMMM, dd}", DateTime.ParseExact(databaseDate, "d/M/yyyy", CultureInfo.InvariantCulture));
}
}
ВСТРОЕННАЯ ПУНКТ ДАТАЛИСТА
protected void dldNotifications_ItemDataBound(object sender, DataListItemEventArgs e)
{
Notifications notification = (Notifications)e.Item.DataItem;
Image imgAlert = (Image)e.Item.FindControl("imgAlert");
Label lblInfo = (Label)e.Item.FindControl("lblInfo");
LinkButton lnkLink = (LinkButton)e.Item.FindControl("lnkLink");
if (!notification.is_read)
{ imgAlert.ImageUrl = "..\\images\\icon-s-msg.gif"; }
else
{ imgAlert.ImageUrl = "..\\images\\icon-valid-fare.png"; }
if (Convert.ToInt32(notification.Type) == Convert.ToInt32(Notification_Type.AgentBooking))
{
lblInfo.Text = "New agent <b>" + notification.Agent_Name + "</b> registerd and waiting for approval. ";
lnkLink.CommandName = Convert.ToInt32(Notification_Type.AgentBooking).ToString();
lnkLink.CommandArgument = notification.NID.ToString();
}
}
ДАННЫЕ В ASPx
<asp:DataList ID="dlNotifications" runat="server"
onitemdatabound="dlNotifications_ItemDataBound" Width="100%"
>
<ItemTemplate>
<div style="background-color:#F2F2F2; width:100%; height:24px; display: table; #position: relative; overflow: hidden;">
<div style=" #position: absolute; #top: 50%;display: table-cell; vertical-align: middle; font-weight:bolder;">
<asp:Label ID="lblDay" ForeColor="#333333" runat="server" Text='<%#Eval("date") %>'></asp:Label>
</div>
</div>
<asp:DataList ID="dldNotifications" runat="server"
DataSource='<%# DataBinder.Eval(Container.DataItem, "listOfNotifications") %>'
Width="100%" onitemdatabound="dldNotifications_ItemDataBound"
onitemcommand="dldNotifications_ItemCommand">
<ItemTemplate>
<div style="width:100%; height:24px; display: table; #position: relative; overflow: hidden;">
<div style=" #position: absolute; #top: 50%;display: table-cell; vertical-align: middle; border-top-style:solid; border-top-color:#E9E9E9; border-top-width:thin;">
<asp:Image ID="imgAlert" runat="server" /> <asp:Label ID="lblInfo" runat="server" Text='<%# Eval("Type") %>'></asp:Label>
<asp:LinkButton ID="lnkLink" CommandArgument='<%# Eval("Type") %>' runat="server">link</asp:LinkButton>
<asp:Label ID="lblAgent_id" runat="server" Text='<%# Eval("Agent_id") %>'
Visible="False"></asp:Label>
</div></div>
</ItemTemplate>
</asp:DataList>
<br />
</ItemTemplate>
</asp:DataList>
ЭТО ВЫХОД:
