获取 ComboBox 的当前索引? [英] Get the current index of a ComboBox?

问题描述

假设我有一个带有这些值的 ComboBox:

Say I had a ComboBox with these values:

Black
Red
Blue

而且我目前选择了 Red.如果用户然后按退格键并按回车键，我将捕获 ComboBox 的 KeyDown 事件.

And I have Red currently selected. If the user then hits backspace and hits enter I am capturing the KeyDown event of the ComboBox.

在这种情况下，我想从组合框中的项目列表中删除红色.

In this event I want to delete Red from the list of items in the ComboBox.

但是，由于调用 KeyDown 时 ComboBox 的文本为空白，SelectedIndex 为 -1.

However, because the text of the ComboBox is blank by the time KeyDown is called, the SelectedIndex is -1.

目前我有一个看起来像这样的解决方法:

Currently I have a workaround that looks like this:

private void myComboBox_SelectedIndexChanged(object sender, EventArgs e)
{
    currentMyComboBoxIndex = myComboBox.FindStringExact(myComboBox.Text);
}

哪个有效..但我只是想知道是否有更好的方法.似乎这种方式可能会以某种方式中断，并且看起来有点混乱.有没有办法获取 ComboBox 的当前索引，而不必使用成员变量跟踪它并在索引更改时更新它?

Which works.. but I was just wondering if there is a better way. It seems like this way could break somehow and it seems a bit messy. Is there no way to get the current index of the ComboBox without having to keep track of it with a member variable and updating it when the index changes?

谢谢.

推荐答案

你的做法很好.您必须将所选索引保留在内存中，因为它在删除文本时返回 -1 作为 SelectedIndex.您也可以通过这种方式获取索引.

The way you are doing is fine. You have to keep the selected index in memory because it returns -1 as the SelectedIndex when the text is deleted. You could take the index in this way too.

private void myComboBox_SelectedIndexChanged(object sender, EventArgs e)
{
    currentMyComboBoxIndex = myComboBox.SelectedIndex;
}

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