Grid not updating with insertion of new rows into underlying data source

Dapfor Team

April 25, 2012 18:11

I have a grid that contains rows with child rows as well. I initially populate the grid by setting my BindingList<Order> to the grid's DataSource.

I need to add additional child rows after the initial binding takes place. Using LINQ, I find the applicable parent row in my BindList<Order> object and add a new child row to the field marked as "HierarchicalField".

However, when I add the new record to my BindingList<Order> object, it does not update the grid, unless I call ResetBindings() on the data source. However, this causes all of the rows to collapse into their parent rows which cannot happen.

I have attached the sample code for your viewing. Please let me know if you have any questions.

Regards,

Dapfor.txt

0

• 

  Dapfor Team

  April 25, 2012 18:14

  Hello,
  
  Replace the collection of orders in the Order class with BindingList<Order>. In this case the grid can subscribe not only to the root collection but also to a collection, returned by the Order.Orders property. The grid will automatically add/remove rows when this collection is changed. You don't need fire FirePropertyChanged("Orders") if you don't instantiate a new instance of BindingList.

  Example:

   

  public class Order : INotifyPropertyChanged
  {
      private readonly IList<Order> _orders = new BindingList<Order>();
      ...
      
      [Field("Orders")]
      [HierarchicalField]
      public IList<Order> Orders
      {
          get
          {
               return _orders;
          }
      }
  }

  
  Kind regards,
  Dapfor

  0
• 

  Dapfor Team

  April 25, 2012 18:16

  Hi,

  Thanks for the quick response. I changed private IList<Order> _orders = new List<Order>();
  to private readonly IList<Order> _orders = new BindingList<Order>();

  
  Still no luck. When I execute
  
  

  var row = ds.OfType<Order>().Where(x => x.TicketNumber == "456").First();
  row.Orders.Add(new Order("2222", "Another Child row"));

  
  The gird does not show the new child row.
  
  Thanks,
  Chris
  
  

  0
• 

  Dapfor Team

  April 25, 2012 18:17

  Hi Chris,
  
  Look at the attached demo project. Each root order contains a BindingList of suborders (of course you can have any number of hierarchies). Add/remove buttons randomly change those lists. Hope, this help you.
  
  Best regards,
  Dapfor

  
  
  
  HierarchicalFieldDemo.png
  HierarchicalFieldDemo.zip

  0

Please sign in to leave a comment.