在组合框C＃默认值数据源 [英] Default value DataSource in ComboBox C#

问题描述

我有一个组合框，那就是我如何填写它的数据：

I have a ComboBox, and that is how I fill the data in it:

SectorCollection sectorCollection = sectorController.SearchAll();

comboSector.DataSource = null;

comboSector.DataSource = sectorCollection;
comboSector.DisplayMember = "titleSector";
comboSector.ValueMember = "idSector";

我要的是设置前的数据，就像没有值在组合框中的文本。
像选择一个部门。这样用户就可以知道他是否被选择。

What I want is to set a pre data, like a text in the combobox without a value. Like "Select a Sector." So the user can knows what does he is selecting.

推荐答案

如果您使用的是WinForm的组合框，那么你应该在代码这样的事情

If you are using a WinForm combobox then you should code something like this

sectorCollection.Insert(0, new Sector() {idSector=0, titleSector="Select a sector"})

comboSector.DataSource = sectorCollection;
comboSector.DisplayMember = "titleSector";
comboSector.ValueMember = "idSector";

您需要添加选择提示为一个新的行业实例添加到集合，然后收集绑定到组合框。当然，这可能是一个问题，如果你使用集合用于其他目的从组合显示

You need to add the selection prompt as a new Sector instance added to the collection and then bind the collection to your combobox. Of course this could be a problem if you use the collection for other purposes a part from the combo display

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