RIA 服务如何返回单个列？

发布于 2024-10-27 00:08:03 字数 358 浏览 2 评论 0原文

我有一个自动完成框，用于选择汽车预订程序的目的地。对于自动完成框的项目源，我尝试将其设置为之前输入的所有目的地。问题是我无法弄清楚如何从我的 Booking 类返回包含不同目的地值的单列“目的地”，例如

        var query = from bk in ObjectContext.Bookings select new DestinationDTO { Destination = bk.Destination };
        return query.Distinct();

。我尝试创建一个共享的 DestinationDTO 类来仅返回单个列，但无法弄清楚如何让它从实体继承！

有什么想法吗？

原文

I have a autocompletebox that is used to select a destination for a car booking program. For the itemssource of the autocomplete box I am trying to set it to all the previous destinations entered. The problem is that I can't work out how to return a single column 'Destination' of distinct destination values from my Booking class, e.g.

        var query = from bk in ObjectContext.Bookings select new DestinationDTO { Destination = bk.Destination };
        return query.Distinct();

. I have tried creating a shared DestinationDTO class to return just the single column but can't work out how to get this to inherit from Entity!!

Any ideas?

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谁对谁错谁最难过 2024-11-03 00:08:03

您的 DestinationDTO 类中需要有一个带有 [Key] 属性的属性。然后RIA服务就能在客户端生成相应的类。

public class DestinationDTO 
{
    [Key]
    public Guid Id { get; set; }

    public string Destination { get; set; }
}

然后就这样做：

var query = from bk in ObjectContext.Bookings 
    select new DestinationDTO { Destination = bk.Destination, Id = Guid.NewGuid() };
    return query.Distinct();

You need to have a property with a [Key] attribute in your DestinationDTO class. Then RIA services will be able to generate a corresponding class on the client side.

public class DestinationDTO 
{
    [Key]
    public Guid Id { get; set; }

    public string Destination { get; set; }
}

Then just do this:

var query = from bk in ObjectContext.Bookings 
    select new DestinationDTO { Destination = bk.Destination, Id = Guid.NewGuid() };
    return query.Distinct();

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