WPF绑定不适用于类

Question

I have binding in XAML

<ComboBox Name="mark" SelectedIndex="1" ItemsSource="{Binding Path=marks}" HorizontalAlignment="Left" Margin="350,300,0,0" VerticalAlignment="Top" Width="120"/>

In C# code i write

 DataContext = new ViewModel();

Where ViewModel is class

 public class ViewModel
{
    ......
    public int[] marks = new int[4] { 2, 3, 4, 5 };

Why I have

"System.Windows.Data Error: 40 : BindingExpression path error: 'marks' property not found on 'object' ''ViewModel' (HashCode=46545237)'. BindingExpression:Path=marks; DataItem='ViewModel' (HashCode=46545237); target element is 'ComboBox' (Name='mark'); target property is 'ItemsSource' (type 'IEnumerable')"

Answer 1

marks must be property to be bind-able.

public class ViewModel
{
    public ViewModel()
    {
        marks = new int[4] { 2, 3, 4, 5 };
    }
    ......
    public int[] marks{get; set;}
}

Answer 2

Some steps are below. 1. Make a public class like as ViewModel. 2. And create a public properties like as public int[] marks and also use get and set. 3. Then you can create constructor to pass array values. 4. After this you can binding with combobox using name.