c# – 当源数据发生变化时如何更新数据绑定组合框？

发布时间：2020-12-15 17:27:57 所属栏目：百科来源：网络整理

导读：我正在为 Windows 8开发一个C#Metro风格的应用程序,当我的数据绑定组合框在源数据发生变化时更新时,我遇到了问题. 这是数据源： public class Range{ public string range_name { get; set; } public string range_description { get; set; } public int min

我正在为 Windows 8开发一个C#Metro风格的应用程序,当我的数据绑定组合框在源数据发生变化时更新时,我遇到了问题.

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)",max = 20}
};

和组合框：

<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>

用户可以操作应用程序中“自定义”范围的最小/最大范围范围,但组合框仅在我更改远离该记录然后更改回“自定义”时更新.

当源数据发生变化时,我需要做什么来强制实时更新组合框？

谢谢

解决方法

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));
        }
    }
}

希望能帮助到你

（编辑：李大同）

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