wpf datagrid 如何自定义行的控件实例，（textbox 并选中则全选）

主要是为了用户输入方便

按回车，选中下一列，text自动获取焦点，输入状态

获取控件实例  https://blog.csdn.net/m15188153014/article/details/48627757 

textbox选中则全选  https://www.cnblogs.com/babietongtianta/p/3952214.html 

        private void dgContent_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            DataGridTemplateColumn tempColumn = this.dgContent.Columns[4] as DataGridTemplateColumn;
            FrameworkElement element = this.dgContent.Columns[4].GetCellContent(this.dgContent.SelectedItem);
            if (element != null)
            {
                //把单元格元素转换为相应的控件，再从该控件中取值
                TextBox ck = tempColumn.CellTemplate.FindName("tb", element) as TextBox;
                if (ck != null)
                {
                    //if(ck.MouseDoubleClick!=null)
                    ck.PreviewMouseDown += new MouseButtonEventHandler(LIKE_textBox_PreviewMouseDown);//注意，这个事件的注册必须在LIKE_textBox获得焦点之前
                    ck.GotFocus += new RoutedEventHandler(LIKE_textBox_GotFocus);
                    ck.LostFocus += new RoutedEventHandler(LIKE_textBox_LostFocus);
                    ck.Focus();
                    ck.PreviewMouseDown -= new MouseButtonEventHandler(LIKE_textBox_PreviewMouseDown);//注意，这个事件的注册必须在LIKE_textBox获得焦点之前
                    ck.GotFocus -= new RoutedEventHandler(LIKE_textBox_GotFocus);
                    ck.LostFocus -= new RoutedEventHandler(LIKE_textBox_LostFocus);

                }  
            }
        }

        void LIKE_textBox_LostFocus(object sender, RoutedEventArgs e)
        {
            (sender as TextBox).PreviewMouseDown += new MouseButtonEventHandler(LIKE_textBox_PreviewMouseDown);
        }

        void LIKE_textBox_PreviewMouseDown(object sender, MouseButtonEventArgs e)
        {
            (sender as TextBox).Focus();
            e.Handled = true;
        }

        void LIKE_textBox_GotFocus(object sender, RoutedEventArgs e)
        {
            (sender as TextBox).SelectAll();
            (sender as TextBox).PreviewMouseDown -= new MouseButtonEventHandler(LIKE_textBox_PreviewMouseDown);
        }