C# WPF ComboBox ItemsSource 绑定问题

Question

I have an issue with binding ComboBox ItemsSource with a list. I read workplaces from csv file. It can't see the Workplaces list. Please, tell me what is wrong. xaml:

    <ComboBox Grid.Column="1" Grid.Row="9" Height="25" Margin="0,18,0,0" ItemsSource="{Binding Workplaces}">
        <ComboBox.ItemTemplate>
            <DataTemplate>
                <TextBlock Text="{Binding title}" />
            </DataTemplate>
        </ComboBox.ItemTemplate>
    </ComboBox>

xaml.cs:

public partial class MainWindow : Window
{
   private BindableCollection<WorkplaceInfo> Workplaces { get; set; }

    public MainWindow()
    {
        InitializeComponent();
        Workplaces = new BindableCollection<WorkplaceInfo>(GetWorkplaces());
    }

    private List<WorkplaceInfo> GetWorkplaces()
    {
        List<WorkplaceInfo> workplaces = new List<WorkplaceInfo>();

        using (var streamReader = new StreamReader("Workplaces.csv"))
        {
            using (var csvReader = new CsvReader(streamReader, CultureInfo.InvariantCulture))
            {
                //csvReader.Context.RegisterClassMap<WorkplaceInfoClassMap>();
                var workplaceInfoList = csvReader.GetRecords<dynamic>().ToList();
                foreach (var wi in workplaceInfoList)
                {
                    workplaces.Add(new WorkplaceInfo(wi.title, wi.member_of.Split(";")));  
                }
            }
        }
        return workplaces;
    }
}

WorkplaceInfo class:

class WorkplaceInfo
{
    public String title { get; }
    public String[] memberOfList { get; }

    public WorkplaceInfo(string title, string[] memberOfList)
    {
        this.title = title;
        this.memberOfList = memberOfList;
    } 
}

Answer 1

Here is your code optimized to work:

   public ObservableCollection<WorkplaceInfo> Workplaces { get; set; }

    public MainWindow()
    {
        this.DataContext = this;
        Workplaces = new ObservableCollection<WorkplaceInfo>(GetWorkplaces());
        InitializeComponent();


    }

    private List<WorkplaceInfo> GetWorkplaces()
    {
        List<WorkplaceInfo> workplaces = new List<WorkplaceInfo>();

        try
        {
            using (var streamReader = new StreamReader("Workplaces.csv"))
            {
                using (var csvReader = new CsvReader(streamReader, CultureInfo.CurrentCulture))
                {
                    //csvReader.Context.RegisterClassMap<WorkplaceInfoClassMap>();
                    var workplaceInfoList = csvReader.GetRecords<dynamic>().ToList();
                    foreach (var wi in workplaceInfoList)
                    {
                        var titl = wi.title;

                        workplaces.Add(new WorkplaceInfo(wi.title, new List<string>() { wi.member_of }.ToArray()));
                    }
                }
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.ToString());
        }
        return workplaces;
    }

So the changes needed in your code are:

1. Set your Workplaces collection to public ObservableCollection
2. Add DataContext binding
3. Read in the Date and create the collection before the main window is initialized (other way round the UI will not detect the change in you object unless you implement INotifyPropertyChanged event)

ps I don't know the structure of your csv file so I made my small demo like (Workplaces.csv) and adopted the parser. You can keep your parser if it matches your csv file structrue.:

title;member_of 
London;First 
Amsterdam;Second

And my warm recommendation is to use try-catch block always when handling files and when working with anything what is external to your application.

Best regards.