Question

In my test scenario, all of the combo boxes have the same value displayed (“<–Select–>”).

private bool AtLeastOnePlatypusSelected()
{
    string DefaultPlatypusValue = "<--Select-->";
    return (cmbxWeek1.SelectedValue != DefaultPlatypusValue) ||
           (cmbxWeek2.SelectedValue != DefaultPlatypusValue) ||
           (cmbxWeek3.SelectedValue != DefaultPlatypusValue) ||
           (cmbxWeek4.SelectedValue != DefaultPlatypusValue) ||
           (cmbxWeek5.SelectedValue != DefaultPlatypusValue) ||
           (cmbxWeek6.SelectedValue != DefaultPlatypusValue) ||
           (cmbxWeek7.SelectedValue != DefaultPlatypusValue) ||
           (cmbxWeek8.SelectedValue != DefaultPlatypusValue) ||
           (cmbxWeek9.SelectedValue != DefaultPlatypusValue);
}

…yet this function is returning true.

Here’s the other combobox code:

public ObservableCollection<ComboBoxItem> cbItems { get; set; }
public ComboBoxItem SelectedcbItem { get; set; }
private Dictionary<int, int> PointNumToWeekNumPairings = new Dictionary<int, int>();

public MainWindow()
{
    InitializeComponent();
    DataContext = this;

    cbItems = new ObservableCollection<ComboBoxItem>();
    var cbItem = new ComboBoxItem { Content = "<--Select-->" };
    SelectedcbItem = cbItem;
    cbItems.Add(cbItem);
    cbItems.Add(new ComboBoxItem { Content = "Tony Iommi" });
    cbItems.Add(new ComboBoxItem { Content = "Mike McCarthy" });
    cbItems.Add(new ComboBoxItem { Content = "Micah Profit" });
    cbItems.Add(new ComboBoxItem { Content = "Allan Poe" });
    cbItems.Add(new ComboBoxItem { Content = "Bill Bailey" });
    cbItems.Add(new ComboBoxItem { Content = "Duane Eddy" });
    cbItems.Add(new ComboBoxItem { Content = "John Kennedy" });
    cbItems.Add(new ComboBoxItem { Content = "Bert Erneson" });
    cbItems.Add(new ComboBoxItem { Content = "Clyde Valouch" });
    cbItems.Add(new ComboBoxItem { Content = "Micky Thompson" });
}

What the Pork Link Wray Charles Dickens is going on here?!?

Answer 1

If your example is a Winforms example, SelectedValue is an object containing the value of the member of the data source specified by the ValueMember property. If you do not have a ValueMember Assigned use the SelectedItem Property instead.

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Be aware that the SelectedValue property and SelectedItem property in WPF return ComboBoxItem objects so you are comparing a ComboBoxItem to a String. Try changing your comparison to something like this:

private bool AtLeastOnePlatypusSelected()
{

    string DefaultPlatypusValue = "<--Select-->";
    return (string)((ComboBoxItem)cmbxWeek1.SelectedValue).Content != DefaultPlatypusValue ||
           (string)((ComboBoxItem)cmbxWeek2.SelectedValue).Content != DefaultPlatypusValue ||
           (string)((ComboBoxItem)cmbxWeek3.SelectedValue).Content != DefaultPlatypusValue ||
           (string)((ComboBoxItem)cmbxWeek4.SelectedValue).Content != DefaultPlatypusValue ||
           (string)((ComboBoxItem)cmbxWeek5.SelectedValue).Content != DefaultPlatypusValue ||
           (string)((ComboBoxItem)cmbxWeek6.SelectedValue).Content != DefaultPlatypusValue ||
           (string)((ComboBoxItem)cmbxWeek7.SelectedValue).Content != DefaultPlatypusValue ||
           (string)((ComboBoxItem)cmbxWeek8.SelectedValue).Content != DefaultPlatypusValue ||
           (string)((ComboBoxItem)cmbxWeek9.SelectedValue).Content != DefaultPlatypusValue;
}