WPF Datagrid Select\Deselect

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Hi all,

I have a DataGrid on a WPF UserControl with a CheckBox column. The DataGrid is bound to an ObservableCollection in the UserControl's ViewModel. I also have a SelectedItem property in the UserControl's ViewModel to which the SelectedItem property of the DataGrid is bound.

What I'm attempting to achieve is when you select a row of the DataGrid, the CheckBox get checked (and obviously the SelectedItem is updated in the ViewModel). If you then click on the same selected row a second time, the CheckBox should become unchecked, but the selected row must not be set to null. (so Ctrl+Click is not going to work for me)

How can I get the DataGrid to realise that I have "selected" a row which is already selected?

I hope someone has a solution for me!

Thanks!

Posted 18-Jan-12 20:31pm

PJ du Preez

Updated 18-Jan-12 20:52pm

Shmuel Zang

v2

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PJ du Preez · Answer 1 · 2012-01-19T22:42:00

Solution 1

Never mind. Managed to solve this on my own.

If you want to know how, ask me, albeit the solution I ended up using is a bit different to the solution i was looking for.

Posted 19-Jan-12 22:42pm

PJ du Preez

Comments

govardhan4u 25-May-12 2:31am

can you let me know how did you solve it?

Pete O'Hanlon · Answer 2 · 2012-01-20T00:39:00

Theoretically this should be fairly easy to achieve based purely on the use of the property you have bound to for IsSelected. What I would do is include a check like this:

C#

public bool IsSelected
{
  get { return isSelected; }
  set
  {
    if (isSelected || isSelected != value) return;
    isSelected = value;
    OnChanged("IsSelected");
  }
}

By including the check to see if isSelected is already true for this row, we can ensure that we don't try to update the row if we have already set it.