从ComboBox（DropDownList）Winforms中删除项目 [英] Remove item from ComboBox (DropDownList) Winforms

问题描述

我有一个已填充的下拉列表

I have a dropdownlist which has been populated

ddlNumbers.DisplayMember = "PhoneNumber";
ddlNumbers.DataSource = mobileList;
ddlNumbers.SelectedItem = null;

单击按钮后，我要从中删除一个项目。

When a button is clicked I want to remove an item from it.

ddlMobileNumbers.Items.RemoveAt(i);

但是请例外。 '设置了DataSource属性时，不能修改项目集合...'

我也尝试将集合重新分配给 DataSource

I have also tried re-assigning a collection to the DataSource

ddlNumbers.DataSource = myNewList

但不起作用。

我在这里做什么错了？ p>

What am I doing wrong here?

推荐答案

当项目绑定到控件时，您不能从列表中删除该项目，可以暂时 null 绑定控件的数据源，然后从列表中删除该项目，然后再次设置数据源。

You can't remove an item from a list when its bound to a control, You can temporarily null the data source of the bound control and remove the item from list and then set the data source again.

类似，

//Null the datasource
Combobox1.Datasource = null;

//Remove the item
ddlMobileNumbers.Items.RemoveAt(i);

//Set the source again
Combobox1.Datasource = ddlMobileNumbers;

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