WPF与对象的组合框绑定问题

Question

I have read several samples like:

• wpf combobox binding
• WPF: How to bind object to ComboBox

But it is friday and my eyes seem square. I can't see my mistake:

public ObservableCollection<Customer> Customers { get; private set; }

public MainWindow()
{            
    InitializeComponent();
    this.Customers = new ObservableCollection<Customer>();
    this.Customers.Add(new Customer() { ID = 123, Name = "John Doe" });
    this.Customers.Add(new Customer() { ID = 456, Name = "Doe John" });
}

and my XAML:

<ComboBox x:Name="cbCustomer" 
          ItemsSource="{Binding Customer}" 
          DisplayMemberPath="Name" 
          SelectedValuePath="ID">
</ComboBox>

I have read that you can either use a datatemplate or the code from above. I prefer a simple dropdown, just like in webforms: <asp:dropdownlist etc> only then in WPF

current output:

Answer 1

You don't set DataContext anywhere

InitializeComponent();
this.Customers = new ObservableCollection<Customer>();
this.DataContext = this;
this.Customers.Add(new Customer() { ID = 123, Name = "John Doe" });
this.Customers.Add(new Customer() { ID = 456, Name = "Doe John" });

and ItemsSource for should be Customers , not Customer . Same as the name of property, not the type of item

<ComboBox ... ItemsSource="{Binding Customers}">