Question

我正在创建一个动态组合框并添加到表单中。我正在尝试使用ArrayList中的DataSource填充组合框，然后根据属性中的值选择组合框中的项目。

问题是，在Form_Load事件完成并且表单可见之后，组合框项才会被绑定。因此，当我尝试设置组合框的选定索引时，组合框为空。请参阅代码，了解我正在做的详细信息，并参考代码中的注释：

Dim cboValues As New ComboBox
cboValues.Width = fieldControlWidth
cboValues.DropDownStyle = ComboBoxStyle.DropDownList

cboValues.Name = "cboResult"

For Each d As SystemTaskResult In [Enum].GetValues(GetType(SystemTaskResult))
    Dim cv As New ComboBoxDisplayValue(d.ToString, d)
    arrValues.Add(cv)
Next

cboValues.DataSource = arrValues
cboValues.DisplayMember = "Display"
cboValues.ValueMember = "Value"

Dim val As SystemTaskResult = DirectCast(p.GetValue(Me.Task, Nothing), SystemTaskResult)

'Was trying to get this to work, but commented out to try the below
'cboValues.SelectedIndex = cboValues.Items.IndexOf(New ComboBoxDisplayValue(val.ToString, val))

'Then this doesn't work because the combo box hasn't updated it's DataSource yet, which is probably the reason for the above not working as well.
For i = 0 To cboValues.Items.Count - 1
    cboValues.SelectedIndex = i
    If cboValues.SelectedValue = val Then
        Exit For
    End If
Next

holdPanel.Controls.Add(cboValues)

如何在没有黑客的情况下为组合框选择正确的选择索引（加载计时器或类似的愚蠢事件）？

Answer 1

试试Form.Shown。见：

How do I execute code AFTER a form has loaded?

动态ComboBox数据源表单加载

1 个答案: