结构和枚举，Combobox.SelectedItem

Question

The program is a minidatabase-ish thing for product ordering purposes, where I keep the unique orders in a struct, and the productNames in an enum (for practice basically). I only have 3 productnames (Product0, Product1, Product2), and they are added to a combobox ( cbo_productNameEdit.DataSource = Enum.GetNames(typeof(productNames)); ).

Anyway, after saving an order, I want this combobox to change it's selected item to the saved product's name, but it fails to do so. I checked it with a MessageBox, to see if it didn't store it properly...

MessageBox.Show(Orders[cbo_productID.SelectedIndex].productName.ToString());
cbo_productNameEdit.SelectedItem = Orders[cbo_productID.SelectedIndex].productName;

... the messagebox returned Product2, which is indeed the correct one, but the selected item stayed at Product0.

Answer 1

One thing you could do to solve it is to set the SelectedIndex instead of SelectedItem property on the combobox. By default Enums are 0 based integers, so the index will corespond to the value of the enum.

cbo_productNameEdit.SelectedIndex = (int)Enum.Parse(typeof(productNames),
                             Orders[cbo_productID.SelectedIndex].productName.ToString());

Answer 2

Because you used .DataSource property for filling ComboBox with items
You need to use .SelectedValue for setting selecting item

cbo_productNameEdit.SelectedValue = Orders[cbo_productID.SelectedIndex].productName;

From MSDN: ComboBox.SelectedValue