[英]How to update a data bound combobox when the source data changes?
I'm working on a C# Metro style app for Windows 8, and I'm having a problem getting my data bound combo box to update when the source data changes. 我正在为Windows 8开发C#Metro风格的应用程序,但是在源数据更改时无法更新数据绑定组合框时遇到了问题。
Here's the data source: 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}
};
And the combo box: 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>
The user can manipulate the min/max range range of the 'custom' range in the app, but the combo box only updates when I change away from that record and then change back to 'custom'. 用户可以在应用程序中操纵“自定义”范围的最小/最大范围,但是组合框仅在我更改该记录然后又变回“自定义”时更新。
What do I need to do to force the combo box to update in real time when the source data changes? 当源数据更改时,我该怎么做以强制组合框实时更新?
Thanks 谢谢
Try implementing INotifyPropertyChanged in your Range class: 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));
}
}
}
Hope it helps ;) 希望能帮助到你 ;)
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