测试代码下载:http://files.cnblogs.com/djangochina/RadioButtonBug.zip
从上面列表选择不同的行,再设置下面不同的radiobutton看看结果
bug情况简单描述如下
一个列表控件listbox、listview或者datagrid,绑定如下
SelectedItem="{Binding SelectedData}"
当然这个SelectedData是一个实现了INotifyPropertyChanged的实体。比如说是Person,里面有 IsMan和IsWoman两个bool
绑定到两个RadionButton
<RadioButton IsChecked="{Binding IsMan}" Content="Man"/> <RadioButton IsChecked="{Binding IsWoman}" Content="Woman"/>
当来回切换列表控件的选中项的时候会发现这两个RadioButton的值会有错误,会修改旧选中项属性的值。
解决方法
public class RadioButtonExtended : RadioButton { public static readonly DependencyProperty IsCheckedExtProperty = DependencyProperty.Register("IsCheckedExt", typeof(bool?), typeof(RadioButtonExtended), new FrameworkPropertyMetadata(false, FrameworkPropertyMetadataOptions.Journal | FrameworkPropertyMetadataOptions.BindsTwoWayByDefault, IsCheckedRealChanged)); private static bool _isChanging; public RadioButtonExtended() { Checked += RadioButtonExtendedChecked; Unchecked += RadioButtonExtendedUnchecked; } public bool? IsCheckedExt { get { return (bool?)GetValue(IsCheckedExtProperty); } set { SetValue(IsCheckedExtProperty, value); } } public static void IsCheckedRealChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { _isChanging = true; ((RadioButtonExtended)d).IsChecked = (bool)e.NewValue; _isChanging = false; } private void RadioButtonExtendedChecked(object sender, RoutedEventArgs e) { if (!_isChanging) IsCheckedExt = true; } private void RadioButtonExtendedUnchecked(object sender, RoutedEventArgs e) { if (!_isChanging) IsCheckedExt = false; } }
使用
<controls:RadioButtonExtended GroupName="Sex" IsCheckedExt="{Binding IsMan}" Content="Man"/> <controls:RadioButtonExtended GroupName="Sex" IsCheckedExt="{Binding IsWoman}" Content="Woman"/>