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//System.InvalidOperationException:“双向绑定需要 Path 或 XPath。”
//在按下界面的datagrid控件时触发绑定的列内容，然后出现此异常
//没有用到SQL数据库，单纯以文本的形式拖拽
//目前参考微软官网WPF发现有动态绑定的信息ObservableCollection
//找到一处感觉会有效的文章 Addr：https://www.cnblogs.com/lonelyxmas/p/3510551.html
//整理一下，问题解决了
//第一步使用datagrid的CellEditEnding控件和BeginningEdit控件，出处：https://docs.microsoft.com/zh-cn/dotnet/api/system.windows.controls.datagrid.celleditending?view=netcore-3.1

XAML： <DataGrid Height="86" VerticalAlignment="Top" Width="628" ItemsSource="{Binding DishMenus}" AutoGenerateColumns="False"  GridLinesVisibility="None"  Grid.Row="1" CellEditEnding="dataGrid_CellEditEnding" BeginningEdit="dataGrid_BeginningEdit">

//第二步在cs文件下添加事件

XAML.cs:
        private void dataGrid_CellEditEnding(object sender, DataGridCellEditEndingEventArgs e)
        {
            set_Form_.CellEditEnding((e.EditingElement as System.Windows.Controls.TextBox).Text);
        }
        private void dataGrid_BeginningEdit(object sender, DataGridBeginningEditEventArgs e)
        {
            set_Form_.BeginningEdit((e.Column.GetCellContent(e.Row) as TextBlock).Text);
        }

//第三步在 ViewModel层去处理这些事件

static string  sTrDataGrid = "";
        public void BeginningEdit(string select)
        {
            //将修改前的值保存起来
            preValue = select;
        }

        public void CellEditEnding(string select)
        {
            string newValue = select;

            if (sTrDataGrid != newValue)
            {
                Data_Service xds = new Data_Service();
                List<Name_DataGrid> dishList = xds.getAllNames();
                foreach (Name_DataGrid d in dishList)
                {
                   if (d.Name == preValue)
                    {
                        var model = dishList.Where(c => c.Name == d.Name).FirstOrDefault();
                        model.Name = newValue;
                        xds.setAllName(dishList);
                    }
                }

            }
        }

//结束，只要肯变强，就不会成为被饿死的徒弟。

doublename

wpf datagrid控件拖动列头，改变顺序，获取改变后的排列顺序

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