How to Bind CurrentCell in WPF datagrid using MVVM pattern

Question

I\'m learning WPF MVVM pattern. I\'m stuck in Binding CurrentCell of datagrid. Basically I need the row index and column index of current cell.

Answer 1

After having a quick poke-around I've noticed a very simple solution to your problem.

First of all there's two problems rather then one here. You cannot bind a CellInfo of a type DataGridCell, it needs to be DataGridCellInfo as xaml cannot convert it on its own.

Secondly in your xaml you will need to add Mode=OneWayToSource or Mode=TwoWay to your CellInfo binding.

Here is a rough example semi-related to your original code

XAML

<DataGrid AutoGenerateColumns="True"
          SelectionUnit="Cell"
          SelectionMode="Single"
          Height="250" Width="525" 
          ItemsSource="{Binding Results}"
          CurrentCell="{Binding CellInfo, Mode=OneWayToSource}"/>

VM

private DataGridCellInfo _cellInfo;
public DataGridCellInfo CellInfo
{
    get { return _cellInfo; }
    set
    {
        _cellInfo = value;
        OnPropertyChanged("CellInfo");
        MessageBox.Show(string.Format("Column: {0}",
                        _cellInfo.Column.DisplayIndex != null ? _cellInfo.Column.DisplayIndex.ToString() : "Index out of range!"));
    }
}

Just a small tip - if you debug your app and look at the Output window it actually tells you if there is any troubles with your bindings.

Hope this helps!

K.