Question

我有两个组合框。如果用户从第一个组合框中选择某个值，那么我希望第二个组合框自动改变并选择其相应的值。

例如：

If Me.InstitutionAdvisoryFirmsComboBox1.SelectedValue = 3 Then 
     Me.WeightComboBox1.SelectedValue = 2

我也尝试过：

If Me.InstitutionAdvisoryFirmsComboBox1.SelectedText = "Internal Guidelines" Then                 
    Me.WeightComboBox1.SelectedText = "None"

有人可以帮忙吗？

Answer 1

//selected index changed event for the combo box 

Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As Object, _
    ByVal e As System.EventArgs) Handles InstitutionAdvisoryFirmsComboBox1.SelectedIndexChanged

    If Me.InstitutionAdvisoryFirmsComboBox1.SelectedIndex = 3 Then 
        If Me.WeightComboBox1.Items.Count >= 2 Then // make sure you are not accessing an index out of range
            Me.WeightComboBox1.SelectedIndex = 2
        End If
    End If

End Sub

Answer 2

您需要使用您正在检查的comboBox的事件处理程序。在事件处理程序中，您可以使用if语句的略微变体：

If Me.InstitutionAdvisoryFirmsComboBox1.SelectedIndex = 1 Then                 
    Me.WeightComboBox1.SelectedIndex = 2

使用SelectedIndex功能时，计数从第0位开始。

使用SelectedValue或SelectedItem用于在combobox内获取该文字或值。

Dim ComboValue As String = comboBox1.SelectedValue.ToString();

或

Dim ComboValue As String = comboBox1.SelectedItem.ToString();

根据另一个Combobox Selected Value - VB.NET设置Combobox Value

2 个答案: