[英]WPF Binding does not update Button-Content
May someone tell me whats wrong with this sourcecode? 有人可能会告诉我这个源代码有什么问题吗? when i click the button its not updating ist value? 当我点击按钮它没有更新ist值? At first binding the converter makes his job. 首先绑定转换器使他的工作。
the sourcecode is pretty big so i will post only some snippets. 源代码非常大,所以我只发布一些代码片段。
XAML: Instances is type of ObservableCollection XAML:Instances是ObservableCollection的类型
<ListBox Name="Instances">
<ListBox.ItemTemplate>
<DataTemplate>
<Button Tag="{Binding Path=Instance.Name}" Content="{Binding Path=Instance.Active, Converter={StaticResource BTSC}}" Click="ChangeAccess"/>
<TextBlock Text="{Binding Path=Instance.Name}"/>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
Converter: 转换器:
public class BoolToStringConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
if (((Boolean)value) == true)
return "No";
else
return "Yes";
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
Event: 事件:
private void ChangeAccess(object sender, RoutedEventArgs e)
{
for...
if ((sender as Button).Tag.ToString() == (DP.Instances[i].Instance as CInstance).Name)
{
SkipIfAndElse...
DP.Instances[i].Instance.Active = true;
}
}
CInstance: CInstance:
class CInstance : INotifyPropertyChanged
{
private Boolean active;
public Boolean Active
{
get { return active; }
set
{
active = value;
NotifyPropertyChanged("Access");
}
}
}
All other values of the CInstance class are updating as expected. CInstance类的所有其他值都按预期更新。
In your CInstance class 在您的CInstance类中
NotifyPropertyChanged("Access");
should be 应该
NotifyPropertyChanged("Active");
I would suggest you start using some kind of INPC framework. 我建议你开始使用某种INPC框架。 I personally like Simon Cropp's Fody . 我个人很喜欢西蒙Cropp的Fody 。 Fody adds the appropriate OnNotifyPropertyChanged as a post compilation step, which means you don't get the Runtime hit that you get with Expression based solutions. Fody将相应的OnNotifyPropertyChanged添加为后编译步骤,这意味着您无法获得基于Expression的解决方案所获得的运行时命中。
At the end of the day, string based OnNotifyPropertyChanged are all pretty fragile. 在一天结束时,基于字符串的OnNotifyPropertyChanged都非常脆弱。
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