ComboBox.SelectedValue 不起作用

Question

What is wrong with this code?

myComboBox.Items.Clear();
myComboBox.Items.AddRange(new string[]{"one","two"});
myComboBox.SelectedValue = "one";

It is showing up with nothing selected.

Answer 1

If you populate the combobox like this:

myComboBox.Items.AddRange(new string[]{"one","two"});

You must use the ComboBox.SelectedItem or the ComboBox.SelectedIndex property to set/get the selected item:

myComboBox.SelectedItem = "one"; //or
myComboBox.SelectedIndex = 0; 

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The ComboBox.SelectedValue property is inherited from ListControl and must be used ONLY when:

• the control is bound to a DataSource
• and ValueMember and DisplayMember properties are definied.

Answer 2

A couple of different options:

1) change SelectedValue to SelectedIndex

myComboBox.SelectedIndex = 0; //your first item

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Please ignore this, this is for asp.net

2) add in ListItem s manualy

myComboBox.Items.Clear();
myComboBox.Items.Add(new ListItem() { Text = "one", Selected = true };
myComboBox.Items.Add(new ListItem() { Text = "two" };

Just make sure you don't have more than one item selected at a given time.