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ComboBox。我想根据某些条件将项目动态添加到ComboBox。因此，我要做的是将选项添加到新列表中，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 ，并且它没有增加-它不等于DataSource的计数。有什么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?

请注意，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中遇到此问题，答案是确保将组合框添加到表单形式的容器控件中。

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）;设置数据源之前输入代码，问题就消失了。

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

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