[英]Async modification of ObservableCollection<T> not represented in DataGrid
It's been a while since I've worked with Forms/WPF. 自从我使用Forms / WPF以来已经有一段时间了。 So excuse me if this is a stupid question.
如果这是一个愚蠢的问题,请原谅。
I have an ObservableCollection<myClass>
named myObservable
where myClass
consists of the following: 我有一个名为
myObservable
的ObservableCollection<myClass>
,其中myClass
包含以下内容:
public class myClass
{
public string myStringOne { get; set; }
public string myStringTwo { get; set; }
public string myStringThree { get; set; }
public string mystringFour { get; set; }
}
And in the UI.xaml the following control. 并在UI.xaml中进行以下控制。
<Grid HorizontalAlignment="Left" Height="239" VerticalAlignment="Top" Width="439">
<DataGrid x:Name="PhoneGrid" VerticalAlignment="Top" Height="134"
CanUserReorderColumns="False"
CanUserResizeColumns="False"
CanUserResizeRows="False"
CanUserSortColumns="False"
Focusable="False"
IsReadOnly="True"
DataContext="{Binding RelativeSource={RelativeSource AncestorType=Window}}"
ItemsSource="{Binding myObservable}" MouseLeftButtonUp="PhoneGrid_MouseLeftButtonUp" SelectionUnit="Cell" Margin="10,100,10,0" />
The way I set my backgroundworker: 我设置背景工作人员的方式:
private readonly BackgroundWorker _worker = new BackgroundWorker();
private readonly object _lock = new object();
_worker.DoWork += LoadLines;
var timer = new Timer(Settings.Default.Interval);
timer.Elapsed += timer_Elapsed;
timer.Start();
LoadLines
being the function I do my UI blocking things in. LoadLines
是我在UI中阻止事物的功能。
I have attempted to implement things like 我试图实现类似
// Prepare obervable collection
BindingOperations.EnableCollectionSynchronization(myObservable, _lock);
Aswell as 以及
Dispatcher.Invoke(() => {
myObservable[index].myString = "anyStr";
});
It works when I add and delete myClass
' from myObservable
. 当我从
myObservable
添加和删除myClass
时,它可以工作。 But when I change a property of myClass
the changes are not reflected in the WPF DataGrid even though myObservable
has had it's value changed. 但是,当我更改
myClass
的属性时,即使myObservable
的值已更改,更改也不会反映在WPF DataGrid中。
What am I missing? 我想念什么?
I've tried several other sources but to no avail. 我尝试了其他几种来源,但无济于事。 Strangely modifying the collection on a thread other than the UI thread seems to be possible.
似乎有可能在UI线程以外的其他线程上修改集合。 And I cannot percieve any difference in behavior when running on the new thread nor invoking it on the UI thread.
而且,我无法在新线程上运行或在UI线程上调用它时在行为上有任何区别。
Your myClass needs to implement INotifyPropertyChanged. 您的myClass需要实现INotifyPropertyChanged。 This is how a WPF data binding notifies the UI that properties change.
这就是WPF数据绑定如何通知UI属性更改的方式。
public class myClass: INotifyPropertyChanged
{
private string _myStringOne;
public string myStringOne {
get { return _myStringOne; }
set
{
if(_myStringOne != value)
{
_myStringOne = value;
NotifyPropertyChanged("myStringOne");
}
}
}
public event PropertyChangedEventHandler PropertyChanged;
public void NotifyPropertyChanged(string propName)
{
if(this.PropertyChanged != null)
this.PropertyChanged(this, new PropertyChangedEventArgs(propName));
}
}
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