c# - 使用特殊类的多个 DisplayMember

Question

我正在尝试获取一个 ListBox 来显示 Accommodation 表的多行的串联。

因为我无法编辑数据源，所以我准备了一个类 AccommodationEntity，它包含原始的 Accommodation 对象和我希望 ListBox 显示的字符串。

但是，由于某些原因，我未能设置 ListBox 的 DisplayMember 属性，因此显示默认的 jibber-jabber。

我按如下方式设置列表框:

accommodationList.DisplayMember = "textToShow";
// load and set up accommodation
List<AccommodationEntity> relatedAccommodations = 
    dt.listHolidayAccommodation(relatedHoliday);
accommodationList.DataSource = relatedAccommodations;
accommodationList.Refresh();

存储在数据源中的对象类如下所示:

class AccommodationEntity
{
    public accommodation classicAccommodation;
    public string textToShow;

    public AccommodationEntity(stay relatedStay)
    {
        this.classicAccommodation = relatedStay.accommodation;

        string from = relatedStay.dateFrom.ToString();
        string to = relatedStay.dateTo.ToString();
        string city = relatedStay.accommodation.location.ToString();
        string hotelName = relatedStay.accommodation.name.ToString();

        this.textToShow = hotelName + ", " + city + " (" + from + " - " + to + ")";
    }
}

}`

最后，有一个方法可以进行一些搜索(返回正确的对象):

public List<AccommodationEntity> listHolidayAccommodation(holiday selectedHoliday)
{
    List<AccommodationEntity> ubytovani = new List<AccommodationEntity>();

    var stays = from singleStay in selectedHoliday.stays
                select singleStay;

    foreach (stay singleStay in stays)
    {
        AccommodationEntity newStay = new AccommodationEntity(singleStay);
        ubytovani.Add(newStay);
    }

    return ubytovani;
}

我知道数据源包含正确的数据，但出于某种原因，DisplayMember 属性似乎仍设置为 ""。

如有任何帮助，我们将不胜感激。

谢谢。

Answer 1

您是否正在设置 DisplayMember和 ValueMember特性？看看 DataSource MSDN 上的属性以查看他们如何设置所有三个属性。

更新:

尝试切换这个:

accommodationList.DisplayMember = "textToShow";
// load and set up accommodation
List<AccommodationEntity> relatedAccommodations = 
    dt.listHolidayAccommodation(relatedHoliday);
accommodationList.DataSource = relatedAccommodations;

为此:

// load and set up accommodation
List<AccommodationEntity> relatedAccommodations = 
    dt.listHolidayAccommodation(relatedHoliday);
accommodationList.DataSource = relatedAccommodations;
accommodationList.DisplayMember = "textToShow";