WinForms ComboBox下拉和自动完成窗口都出现 [英] WinForms ComboBox DropDown and Autocomplete window both appear

问题描述

我在winforms应用程式中有一个 ComboBox ：

I've got a ComboBox on a winforms app with this code:

comboBox1.AutoCompleteMode = AutoCompleteMode.SuggestAppend;
comboBox1.AutoCompleteSource = AutoCompleteSource.ListItems;

DataTable t = new DataTable();
t.Columns.Add("ID", typeof(int));
t.Columns.Add("Display", typeof(string));

for (int i = 1; i < 2000; i++)
{
    t.Rows.Add(i, i.ToString("N0"));
}

comboBox1.DataSource = t;
comboBox1.ValueMember = "ID";
comboBox1.DisplayMember = "Display";

然后，当窗口打开时，请按照以下步骤操作：

I then follow these steps when the window opens:

1. 单击 ComboBox 下拉按钮 - 显示项目列表，并选择 ComboBox


2. 键入'5'，'1'...例如，我正在使用自动填充功能搜索515,516等。 >
   
3. 您会看到自动完成窗口现在显示在下拉列表的顶部。但是，如果我将鼠标悬停在其上，则是接收鼠标事件（包括点击）的自动完成窗口后面的模糊下拉窗口。所以我想我点击了一个自动完成项目，但实际上点击了完全随机，我看不到的东西。

1. Click the ComboBox drop down button -- this displays the list of items and selects the text in the ComboBox
2. Type '5', '1' ... i.e. I'm looking to use autocomplete to search for 515, 516, etc.
3. You'll see that the autocomplete window now appears ON TOP of the drop down list. However if I mouse over, it's the obscured drop down window behind the autocomplete window that's receiving the mouse events, including the click. So I think I'm clicking on an autocomplete item but actually clicking on something totally random that I can't see.

ComboBox 中的错误？我使用Windows 7如果这很重要。我是否以某种方式配置 ComboBox

Is this a bug in the ComboBox? I'm using Windows 7 if that matters. Am I configuring the ComboBoxwrong somehow?

请注意，使用KEYBOARD使用自动完成下拉菜单。因此，上/下箭头键正在使用前窗口，但鼠标正在使用后窗口。

Note also that using the KEYBOARD uses the autocomplete drop down. So up/down arrow keys are using the front window, but the mouse is using the back window.

推荐答案

PropertyGrid。在Win7和Windows XP中都是这样。

No problem getting a repro for this simply by setting the properties from the PropertyGrid. Behaves this way both in Win7 and Windows XP.

这是反馈文章。如上所述，Microsoft不考虑修复。一种可能的解决方法是在DropDown事件处理程序中禁用自动完成功能，并在DropDownClosed事件处理程序中重新启用它。

This is broken behavior documented in this feedback article. As indicated, Microsoft is not considering a fix. One possible workaround is to disable autocomplete in a DropDown event handler and re-enable it in a DropDownClosed event handler.

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