从Access连接到数据集的VB.net级联组合框-更改单元，&；小数到小数

我有一个相当复杂的组合框场景，作为编程新手，我一直在努力寻找最佳的方法

我有一个带有DataTable的数据集，DataTable有几个数字列的数据。数字数据由以美国标准单位给出的距离组成。我目前已经设置好组合框并开始工作，但我需要从两个方面扩展我目前拥有的组合框

我需要能够将数据列中显示的十进制数转换为分数，有没有办法做到这一点并保持数据绑定？在这种情况下，它是数据源的显示成员

我需要能够以不同的单位显示我的下拉选项。。。我已经编写了单元转换类来帮助解决这个问题，但我不知道我是否也可以这样做并维护数据绑定？我还想转换显示成员上的单位

Private Sub ComboBox1_SelectedIndexChanged(sender As System.Object, e As         System.EventArgs) Handles ComboBox1.SelectionChangeCommitted
 Select Case ComboBox1.SelectedItem
    Case "Tire1"
        With ComboBox2
            .DataSource = Tire1BindingSource
            .ValueMember = "OD"
            .DisplayMember = "OD"
        End With
    Case "Tire2"
        With ComboBox2
            .DataSource = Tire2BindingSource
            .ValueMember = "OD"
            .DisplayMember = "OD"
        End With
    Case "Tire3"
        With ComboBox2
            .DataSource = Tire3BindingSource
            .ValueMember = "OD"
            .DisplayMember = "OD"
        End With
    Case "HubCap"
        ComboBox3.DataSource = Nothing
        With ComboBox2
            .DataSource = HubcapBindingSource
            .ValueMember = "ID"
            .DisplayMember = "ID"
        End With
  End Select
End Sub

Private Sub ComboBox2_SelectedIndexChanged(sender As System.Object, e As      System.EventArgs) Handles ComboBox2.SelectionChangeCommitted
Select Case ComboBox1.SelectedItem
    Case "Tire1"
        With ComboBox3
            .DataSource = Tire1BindingSource
            .ValueMember = "ID"
            .DisplayMember = "Weight"
        End With
    Case "Tire2"
        With ComboBox3
            .DataSource = Tire2BindingSource
            .ValueMember = "ID"
            .DisplayMember = "Weight"
        End With
    Case "Tire3"
        With ComboBox3
            .DataSource = Tire3BindingSource
            .ValueMember = "ID"
            .DisplayMember = "Weight"
        End With
    Case "HubCap"
        ComboBox3.DataSource = Nothing
        With ComboBox2
            .DataSource = HubCapBindingSource
            .ValueMember = "ID"
            .DisplayMember = "ID"
        End With
End Select

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在处理显示分数和单位等问题时，使用组合框的最佳方法是什么？

是的，您可以在不影响数据绑定的情况下绘制分数。您必须设置DrawMode属性并处理

DrawItem

和

MeasureItem

事件。欲了解更多信息，请阅读MSDN文章

谢谢，我以前没见过。我将来可能会用到它，但我想我会尝试摆脱分数的要求。