Single click edit in WPF DataGrid

I want the user to be able to put the cell into editing mode and highlight the row the cell is contained in with a single click. By default, this is double click.

How do I override or implement this?

Here is how I resolved this issue:

<DataGrid DataGridCell.Selected="DataGridCell_Selected" 
          ItemsSource="{Binding Source={StaticResource itemView}}">
    <DataGrid.Columns>
        <DataGridTextColumn Header="Nom" Binding="{Binding Path=Name}"/>
        <DataGridTextColumn Header="Age" Binding="{Binding Path=Age}"/>
    </DataGrid.Columns>
</DataGrid>

This DataGrid is bound to a CollectionViewSource (Containing dummy Person objects).

The magic happens there : DataGridCell.Selected="DataGridCell_Selected".

I simply hook the Selected Event of the DataGrid cell, and call BeginEdit() on the DataGrid.

Here is the code behind for the event handler :

private void DataGridCell_Selected(object sender, RoutedEventArgs e)
{
    // Lookup for the source to be DataGridCell
    if (e.OriginalSource.GetType() == typeof(DataGridCell))
    {
        // Starts the Edit on the row;
        DataGrid grd = (DataGrid)sender;
        grd.BeginEdit(e);
    }
}

The answer from Micael Bergeron was a good start for me to find a solution thats working for me. To allow single-click editing also for Cells in the same row thats already in edit mode i had to adjust it a bit. Using SelectionUnit Cell was no option for me.

Instead of using the DataGridCell.Selected Event which is only fired for the first time a row's cell is clicked, i used the DataGridCell.GotFocus Event.

<DataGrid DataGridCell.GotFocus="DataGrid_CellGotFocus" />

If you do so you will have always the correct cell focused and in edit mode, but no control in the cell will be focused, this i solved like this

private void DataGrid_CellGotFocus(object sender, RoutedEventArgs e)
{
    // Lookup for the source to be DataGridCell
    if (e.OriginalSource.GetType() == typeof(DataGridCell))
    {
        // Starts the Edit on the row;
        DataGrid grd = (DataGrid)sender;
        grd.BeginEdit(e);

        Control control = GetFirstChildByType<Control>(e.OriginalSource as DataGridCell);
        if (control != null)
        {
            control.Focus();
        }
    }
}

private T GetFirstChildByType<T>(DependencyObject prop) where T : DependencyObject
{
    for (int i = 0; i < VisualTreeHelper.GetChildrenCount(prop); i++)
    {
        DependencyObject child = VisualTreeHelper.GetChild((prop), i) as DependencyObject;
        if (child == null)
            continue;

        T castedProp = child as T;
        if (castedProp != null)
            return castedProp;

        castedProp = GetFirstChildByType<T>(child);

        if (castedProp != null)
            return castedProp;
    }
    return null;
}

From: http://wpf.codeplex.com/wikipage?title=Single-Click%20Editing

XAML:

<!-- SINGLE CLICK EDITING -->
<Style TargetType="{x:Type dg:DataGridCell}">
    <EventSetter Event="PreviewMouseLeftButtonDown" Handler="DataGridCell_PreviewMouseLeftButtonDown"></EventSetter>
</Style>

CODE-BEHIND:

//
// SINGLE CLICK EDITING
//
private void DataGridCell_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    DataGridCell cell = sender as DataGridCell;
    if (cell != null && !cell.IsEditing && !cell.IsReadOnly)
    {
        if (!cell.IsFocused)
        {
            cell.Focus();
        }
        DataGrid dataGrid = FindVisualParent<DataGrid>(cell);
        if (dataGrid != null)
        {
            if (dataGrid.SelectionUnit != DataGridSelectionUnit.FullRow)
            {
                if (!cell.IsSelected)
                    cell.IsSelected = true;
            }
            else
            {
                DataGridRow row = FindVisualParent<DataGridRow>(cell);
                if (row != null && !row.IsSelected)
                {
                    row.IsSelected = true;
                }
            }
        }
    }
}

static T FindVisualParent<T>(UIElement element) where T : UIElement
{
    UIElement parent = element;
    while (parent != null)
    {
        T correctlyTyped = parent as T;
        if (correctlyTyped != null)
        {
            return correctlyTyped;
        }

        parent = VisualTreeHelper.GetParent(parent) as UIElement;
    }

    return null;
}