我的目标是有一条折线，我可以在其中每 2 秒添加一个点，并且折线在 UI 中反映它。
我有一个折线，它使用值转换器绑定到 ObservableCollection，如下所示：
XAML
<Polyline Points="{Binding OutCollection,Mode=TwoWay,Converter={StaticResource pointConverter}}" Stroke="Blue" StrokeThickness="15" Name="Line2" />
值转换器
public class PointCollectionConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
PointCollection outCollection = new PointCollection();
if (value is ObservableCollection<Point>)
{
var inCollection = value as ObservableCollection<Point>;
foreach (var item in inCollection)
{
outCollection.Add(new Point(item.X, item.Y));
}
return outCollection;
}
else
throw new Exception("Wrong Input");
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new Exception("Wrong Operation");
}
}
在文件后面的代码中：
public MainWindow()
{
InitializeComponent();
this.DataContext = vm;
InitTimer();
}
private void InitTimer()
{
dispatcherTimer = new System.Windows.Threading.DispatcherTimer();
dispatcherTimer.Tick += new EventHandler(TickHandler);
dispatcherTimer.Interval = new TimeSpan(0, 0, 2);
dispatcherTimer.Start();
}
int counter = 0;
private void TickHandler(object sender, EventArgs e)
{
double val = (counter * counter) * (0.001);
var point = new Point(counter, val);
vm.OutCollection.Add(point);
vm.OutCollection.CollectionChanged += OutCollection_CollectionChanged;
counter++;
}
视图模型：
public class ViewModel : ViewModelBase
{
public ObservableCollection<Point> OutCollection
{
get
{
return m_OutCollection;
}
set
{
m_OutCollection = value;
this.OnPropertyChanged("OutCollection");
}
}
}
private ObservableCollection<Point> m_OutCollection;
public ViewModel()
{
OutCollection = new ObservableCollection<Point>();
}
它不工作。任何帮助表示赞赏？！？