WPF绑定不起作用
问题描述:
我简单例子:WPF绑定不起作用
XAML:
<CheckBox IsChecked="{Binding Path=IsSelected, Mode=TwoWay}" Name="cb" />
<Button Name="button1" Click="button1_Click" />
后面的代码:
public partial class MainWindow : Window
{
private ObservableCollection<MyObject> collection = new ObservableCollection<MyObject>();
public MainWindow()
{
InitializeComponent();
collection.Add(new MyObject(true));
//grid.DataContext = collection[0];
}
private void button1_Click(object sender, RoutedEventArgs e)
{
collection[0].IsSelected = false;
}
}
public class MyObject
{
public bool IsSelected { get; set; }
public MyObject(bool isSelected)
{
this.IsSelected = isSelected;
}
}
的cb.IsChecked不通过点击按钮虽然改变集合[0] .IsSelected已更改。
即使我取消注释grid.DataContext =集合[0]; - 没有改变。
在实际的例子中,我在列表框的项目模板中有相同的复选框。所以行为是一样的 - 复选框的选择不会改变。
答
您需要实现您的MyObject类型INotifyPropertyChanged的
答
请尝试以下代码:
public class MyObject : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged(string info)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(info));
}
}
private bool _isSelected;
public bool IsSelected
{
get { return _isSelected; }
set
{
_isSelected = value;
NotifyPropertyChanged("IsSelected");
}
}
public MyObject(bool isSelected)
{
this.IsSelected = isSelected;
}
}