在 MVVM 模式中,是否可以接受甚至可以在后面的视图代码中访问 ViewModel 属性?
我有一个可观察的集合,它填充在 ViewModel 中。我需要在视图中使用它来绑定到带有链表的无尽代码。IE
private LinkedList<Border> tickerForex = new LinkedList<Border>();
public ForexBuy()
{
InitializeComponent();
DataContext = new ForexViewModel();
}
private void InitializeForexTicker()
{
CanvasForexBuyTicker.Children.Clear();
foreach (var currency in DataContext.Currencies) //Is this possible/allowable???
{
AddTickerItem(currency);
}
CanvasForexBuyTicker.Dispatcher.BeginInvoke(DispatcherPriority.Background, new DispatcherOperationCallback(delegate
{ var node = tickerForex.First;
while (node != null)
{
if (node.Previous != null)
{
Canvas.SetLeft(node.Value, Canvas.GetLeft(node.Previous.Value) + node.Previous.Value.ActualWidth + gap);
}
else
{
Canvas.SetLeft(node.Value, CanvasForexBuyTicker.Width + gap);
}
node = node.Next;
}
return null;
}), null);
}
void AddTickerItem(Currency currency)
{
Border border = new Border();
border.Background = new SolidColorBrush(Color.FromArgb(255, 0, 99, 99));
if (currency.IsUpward == 0)
{
border.Background = new SolidColorBrush(Color.FromArgb(255, 255, 153, 0));
}
border.BorderThickness = new Thickness(3);
border.BorderBrush = new SolidColorBrush(Colors.White);
border.CornerRadius = new CornerRadius(10);
border.Width = Double.NaN;
border.Height = 35;
UIHelper.CanvasAutoSize canvas = new UIHelper.CanvasAutoSize();
canvas.Background = Brushes.Green;
canvas.Tag = currency;
canvas.Height = Double.NaN;
TextBlock tb = new TextBlock
{
Text = currency.Code + " " + currency.Sell + " ",
FontSize = 22,
FontWeight = FontWeights.Bold,
Foreground = Brushes.Black
};
tb.SetValue(Canvas.LeftProperty, 8d);
tb.SetValue(Canvas.TopProperty, 2d);
canvas.Children.Add(tb);
tb.TouchDown += TouchTickerItem;
border.Child = canvas;
CanvasForexBuyTicker.Children.Add(border);
Canvas.SetTop(CanvasForexBuyTicker, 3);
Canvas.SetLeft(CanvasForexBuyTicker, 0);
tickerForex.AddLast(border);
}
对于调度程序是否应该从 ViewModel 触发或是否在后面的视图代码中使用它,我有点迷茫。