源数据更改时如何更新数据绑定组合框？

Question

我正在开发适用于 Windows 8 的 C# Metro 风格应用程序，但在源数据更改时更新我的​​数据绑定组合框时遇到问题。

这是数据源：

public class Range
{
    public string range_name { get; set; }
    public string range_description { get; set; }
    public int min { get; set; }
    public int max { get; set; }
}

static List<Range> ranges = new List<Range>
{
    new Range { range_name = "Foo", range_description = "Foo: (0-10)", min = 0, max = 10},
    new Range { range_name = "Bar", range_description = "Bar: (5-15)", min = 5, max = 15},
    new Range { range_name = "Baz", range_description = "Baz: (10-20)", min = 10, max = 20},
    new Range { range_name = "Custom", range_description = "Custom: (0-20)", min = 0, max = 20}
};

还有组合框：

<Grid Background="{StaticResource ApplicationPageBackgroundThemeBrush}">
    <ComboBox Name="combo_range" ItemsSource="{Binding Path=Range}" DisplayMemberPath="range_description" SelectedValuePath="range_name" SelectedValue="{Binding Path=Range}" SelectionChanged="combo_range_SelectionChanged"/>
</Grid>

用户可以在应用程序中操纵“自定义”范围的最小/最大范围范围，但组合框仅在我从该记录更改然后更改回“自定义”时才会更新。

当源数据发生变化时，我需要怎么做才能强制组合框实时更新？

谢谢

Answer 1

尝试在 Range 类中实现 INotifyPropertyChanged：

public class Range : INotifyPropertyChanged
{
    // Declare the event
    public event PropertyChangedEventHandler PropertyChanged;
    private string _range_name;
    private string _range_description;
    private int _min;
    private int _max;

    public string range_name
    {
        get { return this._range_name; }
        set
        {
            _range_name = value;
            OnPropertyChanged("range_name");  
        }  // Call OnPropertyChanged whenever the property is updated
    }
    public string range_description
    {
        get { return this._range_description; }
        set
        {
            _range_description = value;
            OnPropertyChanged("range_description");
        }
    }
    public int min
    {
        get { return this._min; }
        set
        {
            _min=value;
            OnPropertyChanged("min");
        }
    }
    public int max
    {
        get { return this._max; }
        set
        {
            _max = value;
            OnPropertyChanged("max");
        }
    }

    // Create the OnPropertyChanged method to raise the event
    protected void OnPropertyChanged(string name)
    {
        PropertyChangedEventHandler handler = PropertyChanged;
        if (handler != null)
        {
            handler(this, new PropertyChangedEventArgs(name));
        }
    }
}

希望对你有帮助；）