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

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);}

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;    }

One way you could do is by passing one or both of the needed elements in as a CommandParameter:

<MouseBinding     MouseAction="LeftDoubleClick"     Command="cmd:CustomCommands.Open"     CommandParameter="{Binding ElementName=MyDataGrid}}" />

If you need both, you could add a multi-value converter that combines them into a Tuple (or leave it as an object[])

Then in your code-behind you can access it by using e.Parameter