I have developed an easy way to copy/paste data between WPF application and Excel. This code is compatibility for the controls inherit from System.Windows.Controls.ItemsControls these are the controls with the ItemsSource property. Controls of this type are DataGrid, ListBox, ListView, etc.
Is OpendSource and its code is in GitHub.
Its use is very easy, we will install the utility by nuget and we will setup any properties of our control in the XAML code.