C# 如何清除组合框？
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How do I clear a combobox?
提问by Fuzz Evans
I have some combo-boxes that are set up as drop down lists, and the user can pick a number in them. I also have a Clear button that should clear the text from the combo boxes but I can't seem to get it. I've tried:
我有一些设置为下拉列表的组合框，用户可以在其中选择一个数字。我还有一个清除按钮，应该清除组合框中的文本，但我似乎无法得到它。我试过了：
//doesn't work
cboxHour.Text = "";
and
和
//doesn't work
cboxHour.ResetText();
This seems like it should be so straight forward but I'm just not getting it.
这似乎应该如此简单，但我只是不明白。
采纳答案by Daniel Mann
Did you try cboxHour.Items.Clear()?
你试了cboxHour.Items.Clear()吗？
回答by Hand-E-Food
If you just want to clear the current selection, but leave all of the items in the list, you can use:
如果您只想清除当前选择，但保留列表中的所有项目，您可以使用：
cboHour.SelectedIndex = -1
回答by user2415339
cboxHour.Items.Clear();
this works
这有效
回答by Zen
You can use
您可以使用
Cbo.Items.Clear();
or
或者
Cbo.DataSource = null;
if you have a binding on it.
如果你有绑定。
回答by Tapan kumar
Combo Box, DropDown all are having the same logic to clear/remove all items from them and it is like below.
Combo Box、DropDown 都具有相同的逻辑来清除/删除它们中的所有项目，如下所示。
//For checkbox list
cblTest.Items.Clear();
//For drop down list
ddlTest.Items.Clear();
回答by beanmf
When ComboBoxis not data-bound, I've found I need both: Clear()removes the items but still leaves the SelectedItem's text, while ResetText()removes that text. VS2008.
当ComboBox不是数据绑定时，我发现我需要两者： Clear()删除项目但仍保留SelectedItem's 文本，同时ResetText()删除该文本。 VS2008。
ComboBox.Items.Clear();
ComboBox.ResetText();
回答by Rohil Patel
If you have applied datasource to combobox, then it will not be cleared as cmb.Items.Clear().
如果您已将数据源应用于组合框，则它不会被清除为cmb.Items.Clear().
For that you have to assign datasource nullto combobox.
为此，您必须将数据源分配null给组合框。
cmb.DataSource = null;
cmb.Items.Clear();
回答by user5331024
Mine worked with:
我曾与：
ComboBox.removeAllItems();
If it doesn't read that well its, remove all items.
如果它读得不好，请删除所有项目。
回答by user5458887
private void Resetbtn_Click(object sender, EventArgs e)
{
comboBox1.Items.Clear(); // it will clear a combobox
comboBox1.Items.Add("Student"); //then add combobox elements again.
comboBox1.Items.Add("Staff");
}
回答by user5589898
Answer for your question is:
你的问题的答案是：
metroComboBox1.SelectedItem = null;
anycomboBox1.SelectedItem=null;
