wpf中怎么获得dataGrid选中行的值

wpf中如何获得dataGrid选中行的值
wpf中如何获得dataGrid选中行的值

------解决方案--------------------
foreach (var data in dataGridMain.SelectedItems)
{
MyObservableCollection myData = data as MyObservableCollection;
MessageBox.Show(myData.author);
}