问题描述
说我有一个具有以下值的组合框：
Say I had a ComboBox with these values:
Black
Red
Blue
我目前选择了红色。如果用户随后按下退格键并按下Enter键，则说明我正在捕获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.
我想从ComboBox的项目列表中删除Red。
In this event I want to delete Red from the list of items in the ComboBox.
但是，由于ComboBox的文本在 KeyDown 被调用， SelectedIndex 为-1。
However, because the text of the ComboBox is blank by the time KeyDown is called, the SelectedIndex is -1.
当前，我有一种解决方法像这样：
Currently I have a workaround that looks like this:
private void myComboBox_SelectedIndexChanged(object sender, EventArgs e)
{
currentMyComboBoxIndex = myComboBox.FindStringExact(myComboBox.Text);
}
哪个工作..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，并且似乎有些混乱。
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。
/ p>
Thank you.
推荐答案
您的工作方式很好。您必须将选定的索引保留在内存中，因为删除文本后它会返回-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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