Every once in a while we receive support about how to create hierarchical grid directly from objects hierarchy and I decided to post small example how to achieve this easily:
protected void RadGrid1_NeedDataSource(object source, GridNeedDataSourceEventArgs e)
{
RadGrid1.DataSource = MyList;
}
protected void RadGrid1_DetailTableDataBind(object source, GridDetailTableDataBindEventArgs e)
{
e.DetailTableView.DataSource = MyList.Find(
delegate(Master master)
{
return master.ID == Convert.ToInt32(e.DetailTableView.ParentItem.GetDataKeyValue("ID"));
}
).Details;
}
public List<Master> MyList
{
get
{
List<Master> items = new List<Master>();
for (int i = 0; i < 5; i++)
{
Master item = new Master();
item.ID = i;
item.Name = String.Format("Item{0}", i);
List<Detail> detailList = new List<Detail>();
for (int j = 0; j < 5; j++)
{
Detail detailItem = new Detail();
detailItem.ID = j;
detailItem.Name = String.Format("Item{0}", j);
detailItem.MasterID = i;
detailList.Add(detailItem);
}
item.Details = detailList;
items.Add(item);
}
return items;
}
}
public class Master
{
public int ID { get; set; }
public string Name { get; set; }
public List<Detail> Details { get; set; }
}
public class Detail : Master
{
public int MasterID { get; set; }
}
...
<telerik:RadGrid ID="RadGrid1" runat="server" OnNeedDataSource="RadGrid1_NeedDataSource"
OnDetailTableDataBind="RadGrid1_DetailTableDataBind">
<MasterTableView DataKeyNames="ID">
<DetailTables>
<telerik:GridTableView Width="100%" runat="server" />
</DetailTables>
</MasterTableView>
</telerik:RadGrid>
...
The key here is to handle DetailTableDataBind event where you can find easily desired item in your collection a get item details.
Enjoy!