Q:

How to find its owner DataGrid and DataGridRow from DataGridCell in WPF?

In an event handler for a Command for a DataGrid, I get DataGridCell in ExecutedRoutedEventArgs. However, I couldn't figure out how to get its associated DataGrid and DataGridRow. Your help is much appreciated.

A:

You probably want to set some sort of RelativeSource binding that can get you the "parent grid/row" via a {RelativeSource FindAncestor, AncestorType={x:Type DataGrid}}, but your question got me thinking...
You could:
Use Reflection:
var gridCell = ....;
var parentRow = gridCell
         .GetType()
         .GetProperty("RowOwner", 
               BindingFlags.NonPublic | BindingFlags.Instance)
         .GetValue(null) as DataGridRow;

Use the VisualTreeHelper:
var gridCell = ...;
var parent = VisualTreeHelper.GetParent(gridCell);
while(parent != null && parent.GetType() != typeof(DataGridRow))
{
    parent = VisualTreeHelper.GetParent(parent);
}

A:

Here is what I think is a complete answer...
    private void Copy(object sender, ExecutedRoutedEventArgs e)
    {
        DataGrid grid = GetParent<DataGrid>(e.OriginalSource as DependencyObject);
        DataGridRow row = GetParent<DataGridRow>(e.OriginalSource as DependencyObject);
    }

    private T GetParent<T>(DependencyObject d) where T:class
    {
        while (d != null && !(d is T))
        {
            d = VisualTreeHelper.GetParent(d);
        }
        return d as T;
    }

