将WPF组合框ItemsSource绑定到字符串数组时出错

Question

I could not set a combobox's ItemsSource to an Array. I have tried setting the DataContext to the class where the Array is found, and then setting the bindings in XAML

 class Car
{
    public string[] makes;
}

...

public MainWindow()
{
    Car _Car = new Car();
    _Car.makes = new string[]
        {
            "Toyota",
            "Mitsubishi",
            "Audi",
            "BMW"           
        };

    this.DataContext = _Car;
}

and then in XAML

<ComboBox Name="cars" Grid.Column="0" 
              Grid.Row="0" Margin="5" 
              ItemsSource="{Binding Path=makes}"/>

It doesn't seem to do anything. My cars combobox won't have any items.

I've also tried explicitly assigning

cars.ItemsSource= new string[]{
                "Toyota",
                "Mitsubishi",
                "Audi",
                "BMW"           
            };

But then I get this error message:

Exception has been thrown by the target of an invocation.

Is there anything I missed?

Answer 1

WPF binding doesn't support fields. Make it a property that has a getter and setter

class Car
{
    public string[] makes { get; set; }
}

Regardless, you do not have to explicitly state Path , so this should suffice

<ComboBox Name="cars" Grid.Column="0" 
          Grid.Row="0" Margin="5" 
          ItemsSource="{Binding makes}"/>

Answer 2

In Order for data binding to work correctly, you need a 'Property' to bind to.

XAML

<ComboBox Name="cars" Grid.Column="0" 
          Grid.Row="0" Margin="5" 
          ItemsSource="{Binding makes}"/>

Code

class Car
{
    public string[] makes { get; set; }
}