从传入事件的方法返回值

Question

我正在尝试从用户在DataGrid上选择的单元格中提取值。我将需要为多个DataGrids执行此操作，但目前我无法获取“getDataGridCellMethod”方法来返回一个值，因为我不断收到错误“名称Dec在当前上下文中不存在”

//第一个网格选择更改事件

    public void grid_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        decimal Dec = getDataGridCell.returnCellValue(sender, e);
    }

//返回所选单元格值的方法

    public static class getDataGridCell
    {
        public static decimal returnCellValue(object sender, SelectionChangedEventArgs e)
        {

            DataGrid grid = sender as DataGrid;
            if (e.AddedItems != null && e.AddedItems.Count > 0)
            {
                DataGridRow row = (DataGridRow)grid.ItemContainerGenerator.ContainerFromItem(e.AddedItems[0]);
                if (row != null)
                {
                    DataGridCellsPresenter presenter = GetVisualChild<DataGridCellsPresenter>(row);
                    DataGridCell cell = presenter.ItemContainerGenerator.ContainerFromIndex(0) as DataGridCell;
                    if (cell != null)
                    {
                        Decimal Dec = Convert.ToDecimal(((TextBlock)cell.Content).Text);
                    }
                    return Dec;
                }
    }
    }
    }


    static T GetVisualChild<T>(Visual parent) where T : Visual
    {
        T child = default(T);
        int numVisuals = VisualTreeHelper.GetChildrenCount(parent);
        for (int i = 0; i < numVisuals; i++)
        {
            Visual v = (Visual)VisualTreeHelper.GetChild(parent, i);
            child = v as T;
            if (child == null) child = GetVisualChild<T>(v);
            if (child != null) break;
        }
        return child;
    }
            }

        }

    }

如果我将returnCellValue方法嵌套在事件中并直接在if语句中使用Dec的值，那么这是有效的，但我宁愿不必为每个DataGrid执行此操作