如何设置ComboBox的SelectedIndex [英] How Set SelectedIndex for ComboBox

问题描述

我在sqlServer中有一个像这样的表:

ID标题说明
-----------------------------------
1名导演
3演员
5生产者

在我的项目中有2种形式:
1.活动
2. ActivityDialog

当我单击Edit_Click()时，将显示ActivityDialog.

ActivityDialog窗体中有一个DataBound组合框，其DisplayMember为标题"，ValueMember为"ID".
在ActivityDialog_Load()处，我想为comboBox设置selectedIndex以显示当前记录的ActivityType.

我尝试过这些，但是它们都返回-1:

I have a table in sqlServer like this:

ID Title Description
-----------------------------------
1 Director
3 Actor
5 Producer

And in my project there is 2 Form:
1. Activity
2. ActivityDialog

When I Click on Edit_Click() the ActivityDialog will be shown.

There is a DataBound comboBox in ActivityDialog Form which its DisplayMember is "Title" and ValueMember is "ID".
At ActivityDialog_Load() I want to set selectedIndex for comboBox to show the current record''s ActivityType.

I have tried these but both of them returns -1:

comboBox.SelectedIndex = comboBox.Items.IndexOf(1);

还有

And

comboBox.SelectedIndex = comboBox.Items.IndexOf("Director");

推荐答案

尝试一下:
comboBox.SelectedIndex = 1;

并且组合框通常绑定到一个集合，因此请以插入的代码获取该集合中的索引.

Try this:
comboBox.SelectedIndex = 1;

and the combobox is usually boiunded to a collection, so get the index in the collection in code insted.

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