WPF DataGrid 获取选中的当前行某列值

方法一：  
DataRowView mySelectedElement = (DataRowView)dataGrid1.SelectedItem;   
string result = mySelectedElement.Row[0]ToString();   
  
方法二：  
var a = this.dataGrid1.SelectedItem;  
var b = a as DataRowView;  
string result = b.Row[0].ToString();