https://learn.microsoft.com/ja-jp/dotnet/api/system.windows.controls.datagridcolumn.oncopyingcellclipboardcontent?view=netframework-4.8.1&viewFallbackFrom=netcore-3.1
DataGridColumn.OnCopyingCellClipboardContent(Object) Method (System.Windows.Controls) | Microsoft...
Raises the CopyingCellClipboardContent event.
objectmethodsystemwindowscontrols