DataGridViewComboBoxColumn在运行时...... [英] DataGridViewComboBoxColumn in run time ......

问题描述

嗨 我在运行时创建了一个DataGridViewComboBoxColumn，找到了选定的项目，但是当我在项目中编写此代码时，它返回null

Hi I created a DataGridViewComboBoxColumn in run time and I found the selected item, but when I wrote this code in my project it returns null

datagridview1.Rows[i].Cells[0].Value.ToString();

请帮助我

Please Help Me

推荐答案

通过它返回null"，我假设您的意思是您收到了Null引用异常-ToString无法返回null.

问题是，其余的代码是什么样的?

您说要在运行时创建它-是否输入了任何值?您是否为组合框设置了一个值或将其保留为空白下拉菜单?
您将代码放在哪里?在SelectionChanged事件中?如果是这样，那么在首次创建DataGridView时，您将获得一个事件(和空引用).

By "it returns null" I assume that you mean you get a Null Reference exception - ToString cannot return null.

The question is, what does the rest of your code look like?

You say you are creating this at run time - did you put any values in? Did you set a value for the combobox or leave it as a blank drop down?
Where did you put that code? In the SelectionChanged event? If so, then you will get an event (and a null reference) when the DataGridView is first created.

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