如何在C＃中仅显示ComboBox中项目的子字符串 [英] How to show only a substring of an item in a ComboBox in C#

问题描述

我在组合框中有一些公司名称作为项目，例如：

I have some Company names as Items in a ComboBox like this:

123 SomeCompany

始终在100到999之间的数字加上公司名称。

Always a number between 100 and 999 plus the company name.

现在，如果用户选择一个项目，我希望文本框仅显示数字，而不显示公司名称。公司名称仅在他放下ComboBox时才可见...

Now if the user selects an Item I want the TextBox to only show the number, not the company name. he company name should only be visible when he drops down the ComboBox...

我尝试设置 ComboBox1.Text = ComboBox.Text.Substring （0，3）在SelectedIndexChanged-Event和TextChanged-Event中，但是它什么也没做，在ComboBox中总有一切...

I tried to set ComboBox1.Text = ComboBox.Text.Substring(0, 3) in the SelectedIndexChanged-Event and the TextChanged-Event, but it didn't do anything, there was always everything in the ComboBox...

自动完成模式设置为无。

我做错了什么？

推荐答案

要始终设置值格式，可以使用Format事件（带有FormattingEnabled = true）

To always format the value, you could use the Format event (with FormattingEnabled = true)

    private void comboBox1_Format(object sender, ListControlConvertEventArgs e)
    {   
          e.Value = e.Value.ToString().Substring(0, 3);
    }

但是，如果您希望在显示下拉菜单时显示完整值，您可以暂时禁用格式设置：

But if you want the full value to be displayed when the dropdown is shown, you can temporarily disable the formatting:

    private void comboBox1_DropDown(object sender, EventArgs e)
    {
        comboBox1.FormattingEnabled = false;
    }

    private void comboBox1_DropDownClosed(object sender, EventArgs e)
    {
        comboBox1.FormattingEnabled = true;
    }

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