是否可以将ComboBox DisplayMember设置为列表中对象的属性? [英] Is it possible to have a ComboBox DisplayMember set to a property of an object in a list?

问题描述

我正在填充一个ComboBox，其中ComboBox.Items中的每个对象都是一个对象列表.当前，组合框为每个项目显示(集合)".

I have a ComboBox being populated where each object in ComboBox.Items is a List of objects. Currently the ComboBox displays "(Collection)" for each Item.

是否可以让ComboBox显示列表中包含ComboBox项的第一个对象的成员?

Is it possible to have the ComboBox display a member of the first object in the List that comprises an Item of the ComboBox?

我目前正在通过以下方式填充ComboBox项:

I am currently populating the ComboBox items by the following:

foreach(List<SorterIdentifier> sorterGroup in m_AvailableSorterGroups)
{
    // There are conditions that may result in the sorterGroup not being added
    comboBoxSorterSelect.Items.Add(sorterGroup);
}

//comboBoxSorterSelect.DataSource = m_AvailableSorterGroups; // Not desired due to the comment above.
//comboBoxSorterSelect.DisplayMember = "Count"; //Displays the Count of each list.

我想在ComboBox中显示的值可以通过以下方式引用:

The value that I would like to have displayed in the ComboBox can be referenced with:

((List<SorterIdentifier>)comboBoxSorterSelect.Items[0])[0].ToString();
((List<SorterIdentifier>)comboBoxSorterSelect.Items[0])[0].DisplayName; // public member

推荐答案

您可以创建对象包装并覆盖ToString()方法:

You can create an object wrapper and override the ToString() method:

public class ComboBoxSorterIdentifierItem
{

  public List<SorterIdentifier> Items { get; }

  public override string ToString()
  {
    if ( Items == null || Items.Count == 0) return "";
    return Items[0].ToString();
  }

  public BookItem(List<SorterIdentifier> items)
  {
    Items = items;
  }

}

您也应该覆盖SorterIdentifier.ToString()以返回所需的内容，如DisplayName.

You should override the SorterIdentifier.ToString() too to return what you want like DisplayName.

现在，您可以像这样在组合框中添加项目:

Now you can add items in the combobox like this:

foreach(var sorterGroup in m_AvailableSorterGroups)
{
  item = new ComboBoxSorterIdentifierItem(sorterGroup);
  comboBoxSorterSelect.Items.Add(item);
}

例如，要使用所选项目，您可以编写:

And to use the selected item for example, you can write:

... ((ComboBoxSorterIdentifierItem)comboBoxSorterSelect.SelectedItem).Item ...

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