使用C#和WPF在代码中绘制线条

Drawing lines in code using C# and WPF

我正在尝试使用7段显示器创建数字时钟显示器。我可以使用以下代码在XAML中绘制线条：

1	<Line Name="line7" Stroke="Black" StrokeThickness="4" X1="10" X2="40" Y1="70" Y2="70" Margin="101,-11,362,250" />

但是当我尝试用代码(从MainWindow()中)执行此操作时，它不起作用：

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Line line = new Line();
Thickness thickness = new Thickness(101,-11,362,250);
line.Margin = thickness;
line.Visibility = System.Windows.Visibility.Visible;
line.StrokeThickness = 4;
line.Stroke = System.Windows.Media.Brushes.Black;
line.X1 = 10;
line.X2 = 40;
line.Y1 = 70;
line.Y2 = 70;

我的想法是我可以绘制7条线，然后根据需要为不同的数字切换它们的可见性。我确定这可以通过多种方法完成，但是为什么我不能在这样的代码中画线呢？

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public class Cls_Barriere
{

// animazione periferica
public static void LineAnimation(Line _line,String _colore)
{
Storyboard result = new Storyboard();
Duration duration = new Duration(TimeSpan.FromSeconds(2));

ColorAnimation animation = new ColorAnimation();
animation.RepeatBehavior = RepeatBehavior.Forever;
animation.Duration = duration;
switch (_colore.ToUpper())
{
case"RED":
animation.From = Colors.Red;
break;
case"ORANGE":
animation.From = Colors.Orange;
break;
case"YELLOW":
animation.From = Colors.Yellow;
break;
case"GRAY":
animation.From = Colors.DarkGray;
break;
default:
animation.From = Colors.Green;
break;
}

animation.To = Colors.Gray;
Storyboard.SetTarget(animation, _line);
Storyboard.SetTargetProperty(animation, new PropertyPath("(Line.Stroke).(SolidColorBrush.Color)"));
result.Children.Add(animation);
result.Begin();

}
}
//***************************************************************************

public partial class MainPage : UserControl
{
public Line _line;

public MainPage()
{
InitializeComponent();
Canvas.MouseLeftButtonDown += Canvas_MouseLeftButtonDown;
Canvas.MouseLeftButtonUp += Canvas_MouseLeftButtonUp;
}

void Canvas_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
_line.X2 = e.GetPosition(this.Canvas).X;
_line.Y2 = e.GetPosition(this.Canvas).Y;
_line.Loaded += _line_Loaded;
Canvas.Children.Add(_line);
}

void _line_Loaded(object sender, RoutedEventArgs e)
{
Cls_Barriere.LineAnimation(sender as Line,"RED");
}

void Canvas_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
_line = new Line();
_line.Stroke = new SolidColorBrush(Colors.White);
_line.StrokeThickness = 5;
_line.StrokeStartLineCap = PenLineCap.Round;

_line.StrokeEndLineCap = PenLineCap.Round;
_line.StrokeDashCap = PenLineCap.Round;

_line.X1 = e.GetPosition(this.Canvas).X;
_line.Y1= e.GetPosition(this.Canvas).Y;

}