Question

我有一个分配了数据源的组合框：

Public Sub DataBind(ByVal table As DataTable, ByVal DisplayMember As String, ByVal ValueMember As String)
    cbox.DataSource = table
    cbox.DisplayMember = DisplayMember
    cbox.ValueMember = ValueMember
End Sub

我想迭代ComboboxItems中的每个项目并获得其ValueMember和DisplayMember。我看了这篇文章ValueMember from ComboBox.Items[i] using WinForms c#

所以我试过

For I As Integer = 0 To cbox.Items.Count - 1
  Dim val = DirectCast(cbox.Items(I), KeyValuePair(Of Integer, String)).Value
Next

但是我得到一个无效的强制转换异常，说明指定的强制转换是无效的。我做错了什么？

Answer 1

找到了我想要实现的目标的另一种解决方案：

Dim row As DataRow = DirectCast(cbox.Items(I), DataRowView).Row
Dim val As String = (row(cbox.ValueMember)).ToString()

Winforms-如何获得Combobox的ValueMember（i）

1 个答案: