ComboBox初始值未重置 [英] ComboBox initial value is not resetting

问题描述

当我最初显示我的ComboBox时，使用该行...

When I initially display my ComboBox, using the line ...

ComboBox3.SelectedIndex = -1

...根据需要显示为空白。



然而，当我已经从ComboBox中选择然后取消，以便重置表单，ComboBox不会显示为空白但它保留我之前做出的选择。



任何想法为什么&如何将其重置为Null？



代码如下，相当基本的东西：

... it displays as blank, as required.

However, when I have made a selection from that ComboBox and then Cancelled, so as to reset the form, the ComboBox does not display as blank but it retains the selection I previously made.

Any ideas why & how I can reset it to being Null ?

The code is as follows, fairly basic stuff :

Public Sub Tab4_Selected()

    ComboBox3.Items.Clear()

    For Each Item In ComboBox1.Items
        With ComboBox3.Items
            .Add(Item)
        End With
    Next

    ComboBox3.Items.RemoveAt(0)

    ComboBox3.SelectedIndex = -1

    Button1.Visible = True
    Button2.Visible = True
    Button11.Visible = False
    Button12.Visible = False
    Button13.Visible = False
    Label4.Visible = False
    Label5.Visible = False
    Label6.Visible = False
    Label7.Visible = False
    Label8.Visible = False
    DateTimePicker1.Visible = False
    DateTimePicker2.Visible = False
    DateTimePicker3.Visible = False
    DateTimePicker4.Visible = False
    TextBox1.Visible = False

End Sub

推荐答案

我刚刚模拟了你的概率lem ...

这里，把这一行放在SelectedIndex = -1之下，不要担心，没有选择任何项目。

I have just simulated your problem...
Here, put this line below your SelectedIndex = -1 and don't worry, no item is selected.

comboBox1.SelectedIndex = -1;
comboBox1.ResetText();

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