c# - 过滤掉实体中的结果 C# 不包含执行的定义

Question

我想从查询中使用此命令过滤掉结果，但出现此错误：

这是导致错误的代码：

    private void Bookings_Loaded(object sender, RoutedEventArgs e)
    {
        WpfApplication7.AllensCroftEntities1 allensCroftEntities1 = new WpfApplication7.AllensCroftEntities1();

        // Load data into Bookings. You can modify this code as needed.
        var bookingsViewSource = ((CollectionViewSource)(this.FindResource("bookingsViewSource")));
        var bookingsQuery = this.GetBookingsQuery(allensCroftEntities1).Where(x => x.Date == variables.date);
        bookingsViewSource.Source = bookingsQuery.Execute(MergeOption.AppendOnly);

   private System.Data.Objects.ObjectQuery<Booking> GetBookingsQuery(AllensCroftEntities1 allensCroftEntities1)
    {

      EDIT

这里是

        System.Data.Objects.ObjectQuery<WpfApplication7.Booking> bookingsQuery = allensCroftEntities1.Bookings;
        // To explicitly load data, you may need to add Include methods like below:
        // bookingsQuery = bookingsQuery.Include("Bookings.Client").
        // For more information, please see http://go.microsoft.com/fwlink/?LinkId=157380
        // Update the query to include Room.Bookings data in Bookings. You can modify this code as needed.
        bookingsQuery = bookingsQuery.Include("Room.Bookings");
        // Returns an ObjectQuery.
        return bookingsQuery;
    }

顺便编辑这里是我的问题的视频，如果它有助于解决问题 的视频

现在编辑我收到此错误：

Answer 1

如果要更改查询中的合并选项，则应使用

((ObjectQuery)bookingsQuery).MergeOption = MergeOption.AppendOnly;

如果您希望执行查询，您可以调用.ToList()这将执行查询并应用您的过滤器

你的代码应该像

var bookingsQuery = this.GetBookingsQuery(allensCroftEntities1).Where(x => x.Date == variables.date);
((ObjectQuery)bookingsQuery).MergeOption = MergeOption.AppendOnly;
bookingsViewSource.Source = bookingsQuery.ToList();

Answer 2

没有执行。bookingsQuery 将作为数据消费者迭代查询定义的数据的一部分自动“执行”。