在WPF中将字典绑定到组合框显示不正确

Question

Resolved - The theme was interfering with the display

This is my first experience with WPF so there may be an obvious answer to this.

I'm trying to display a Month selection combobox where the month names are displayed, and when a selection is made the integer value is captured.

XAML

<ComboBox Margin="5" IsEditable="False" 
         IsEnabled="{Binding IsCompanyFileUploadPeriodEnabled}" 
         ItemsSource="{Binding StartMonths}" 
         DisplayMemberPath="Key" 
         SelectedValuePath="Value" 
         SelectedValue="{Binding SelectedStartMonthID}" 
         Width="50"></ComboBox>

Edit: The ViewModel extends the Galasoft MvvmLight ViewModelBase, which provides the RaisePropertyChanged method.

ViewModel

Dictionary<string, int> _startMonths;
public Dictionary<string, int> StartMonths
{
    get
    {
        if (_startMonths == null)
        {
            _startMonths = new Dictionary<string, int>();
            for (int i = 1; i < 13; i++)
            {
                _startMonths.Add(System.Globalization.DateTimeFormatInfo.CurrentInfo.GetMonthName(i),
                    i);
            }
        }
        return _startMonths;
    }
}

int _selectedStartMonthID;
public int SelectedStartMonthID
{
    get
    {
        return _selectedStartMonthID;
    }
    set
    {
        _selectedStartMonthID = value;
        RaisePropertyChanged(() => SelectedStartMonthID);
    }
}

But for some reason when I run the app the combobox is displaying as

• [January, 1]
• [February, 2]
• etc

Does anyone know why it might be ignoring the DisplayMemberPath instruction? The SelectedValuePath setting seems to be working fine when an element is selected.

Answer 1

ComboBox DisplayMemberPath binding is broken by Themes BureauBlue and WhistlerBlue

http://wpf.codeplex.com/workitem/10129

Answer 2

Take a look at StringFormat.

MSDN StringFormat