C# 在 WPF ComboBox 中以编程方式清除选择
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Programmatically Clear Selection in WPF ComboBox
提问by Bob Wintemberg
I have a ComboBox in WPF whose ItemsSource is set to a list programmatically. How would I go about clearing the selection in an event handler? I've tried:
我在 WPF 中有一个 ComboBox，其 ItemsSource 以编程方式设置为列表。我将如何清除事件处理程序中的选择？我试过了：
comboBox.SelectedIndex = -1;
comboBox.SelectedItem = null;
comboBox.SelectedValue = null;
comboBox.SelectedValue = "";
None of them have any effect.
它们都没有任何效果。
采纳答案by laktak
comboBox.SelectedIndex = -1;works for me.
comboBox.SelectedIndex = -1;为我工作。
Are you doing anything else in your event handler? Are you using databinding?
你在你的事件处理程序中做其他事情吗？你在使用数据绑定吗？
回答by configurator
comboBox.SelectedIndex = -1;
Is the way to go. I don't know why it doesn't work for you; perhaps an event handler for SelectedIndexChangedchanges the value?
是要走的路。我不知道为什么它对你不起作用；也许是用于SelectedIndexChanged更改值的事件处理程序？
回答by Andrew Milford
I found that I needed to also add:
我发现我还需要添加：
comboBox.Text = "";
to get the text to clear
清除文本
回答by Shashika
I want to clear the ComboBoxin DropDownClosedevent of another ComboBox. Therefore I used following code inside of first ComboBoxDropDownClosedevent
我想清除ComboBox的DropDownClosed另一事件ComboBox。因此我在第一个ComboBoxDropDownClosed事件中使用了以下代码
private void comboBox1_DropDownClosed(object sender, EventArgs e)
{
this.comboBox.ItemsSource = null;
}
回答by Juan Hernandez Ortiz
In the following example I show the way it worked for me, this for a ComboBox from a user control:
在下面的示例中，我展示了它对我的工作方式，这适用于来自用户控件的 ComboBox：
Combobox in the usercontrol:
用户控件中的组合框：
<ComboBox x:Name="OFFSE_INI_CMBX" HorizontalAlignment="Left" Margin="26,106,0,0" VerticalAlignment="Top" Height="20" Width="100" DropDownClosed="OFFSE_INI_CMBX_DropDownClosed">
<ComboBoxItem x:Name="NV" Content=" NV" ToolTip="Sub Command Tooltip 1" Height="20" Selected="NV_Selected"></ComboBoxItem>
</ComboBox>
Function that works
有效的功能
private void OFFSE_INI_CMBX_DropDownClosed(object sender, EventArgs e)
{
this.OFFSE_INI_CMBX.SelectedIndex = -1;
this.OFFSE_INI_CMBX.Text = "";
}
