在.net组合框上显示一个值并存储另一个值的最佳方法是什么？

Question

我似乎找不到一个易于使用的.net本地方式来获取.net winforms上的Comboboxes来显示一个值并根据选择返回另一个值而不创建我自己的帮助类,知道winforms将要显示放在其中的对象上的ToString方法.

这就是我现在正在做的事情,非常一般.首先,创建辅助类.

 Public Class ListItem
     Public Value As Object
     Public DisplayString As String

     Public Sub New(ByVal NewValue As Object, ByVal NewDisplayString As String)
         Value = NewValue
         DisplayString = NewDisplayString
     End Sub

     Public Overrides Function ToString() As String
         Return DisplayString
     End Function
 End Class

然后,从集合或其他任何东西加载组合框.

    For Each o as WhateverObject In CollectionIwantToaddItemsFrom
        li = New ListItem(o.ValueToReturn, o.ValueToDisplay)
        Me.ComboBox1.Items.Add(li)
    Next

最后,使用该对象

Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs) Handles ComboBox1.SelectedIndexChanged
if me.combobox1.selecteditem is nothing then exit sub
Dim li As ListItem = me.ComboBox1.SelectedItem
Dim o as object = li.value 
'do stuff with o.
end sub

我敢肯定,在我正在寻找的框架中,我最好使用一些东西.它是什么？

Answer 1

这有点像黑客,但这意味着你不必编写自己的Name-Value对类 - 没什么大不了的(可能在框架中已经有了更好的东西).但你可以做的是使用DictionaryEntry类 - 它实际上是一个名称值对.将项添加到列表中,然后使用组合框上的DataMember和ValueMember属性绑定到DictionaryEntry类的键和值属性.像这样:

    var list = new List<System.Collections.DictionaryEntry>();
    list.Add(new System.Collections.DictionaryEntry("one", 1));
    list.Add(new System.Collections.DictionaryEntry("two", 2));
    list.Add(new System.Collections.DictionaryEntry("three", 3));

    comboBox1.DataSource = list;
    comboBox1.DisplayMember = "Key";
    comboBox1.ValueMember = "Value";

刚刚意识到你更喜欢vb方言.以下对VB也是如此:-)

Dim list As List(Of DictionaryEntry)

list = New List(Of DictionaryEntry)
list.Add(New DictionaryEntry("One", 1))
list.Add(New DictionaryEntry("Two", 2))
list.Add(New DictionaryEntry("Three", 3))

ComboBox1.DataSource = list
ComboBox1.DisplayMember = "Key"
ComboBox1.ValueMember = "Value"