ComboBox items.count 与数据源不匹配 [英] ComboBox items.count doesn't match DataSource

问题描述

我有一个绑定到数据源的组合框.我想根据某些条件将项目动态添加到 ComboBox.所以我所做的是将选项添加到一个新列表中，然后像这样更改 ComboBox 的数据源:

I have a ComboBox that is bound to a DataSource. I want to dynamically add items to the ComboBox based on certain conditions. So what I've done is add the options to a new list, and then change the DataSource of the ComboBox like so:

cbo.DataSource = null;
cbo.DataSource = cbos;
cbo.DisplayMember = "Title";
cbo.ValueMember = "Value";

然后，我检查 cbo.Items.Count，它没有增加 - 它不等于数据源的计数.任何想法我可以在这里做什么?

Then, I check cbo.Items.Count, and it has not incremented - it does not equal the count of the DataSource. Any ideas what I can do here?

注意这是 WinForms 而不是 ASP.NET.

Note this is WinForms and not ASP.NET.

推荐答案

如果有人在动态添加的组合框上遇到此问题，答案是确保将组合框添加到表单中容器的控件中.

If anyone experiences this problem on a dynamically added combobox, the answer is to ensure that you add the combobox to the controls of a container in the form.

>

通过添加this.Controls.Add(cbo);"设置数据源之前的代码，问题就解决了.

By adding "this.Controls.Add(cbo);" to the code before setting the datasource, the problem goes away.

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