我在一个简单的 Silverlight 页面中运行了以下示例:
public Page()
{
InitializeComponent();
InitializeOther();
}
private DoubleCollection dashes;
public DoubleCollection Dashes
{
get
{
//dashes = new DoubleCollection(); //works ok
//dashes.Add(2.0);
//dashes.Add(2.0);
if (dashes == null)
{
dashes = new DoubleCollection(); //causes exception
dashes.Add(2.0);
dashes.Add(2.0);
}
return dashes;
}
set
{
dashes = value;
}
}
private void InitializeOther()
{
Line line;
for (int i = 0; i < 10; i++)
{
line = new Line();
line.Stroke = new SolidColorBrush(Colors.Blue);
line.StrokeDashArray = Dashes; //exception thrown here
line.X1 = 10;
line.Y2 = 10;
line.X2 = 400;
line.Y2 = 10 + (i * 40);
canvas1.Children.Add(line);
}
}
上面的代码在标记的行上抛出 System.ArgumentException。示例中还标记了该问题的一种解决方案。
有谁知道这个问题是否与属性 System.Windows.Shapes.Shape.StrokeDashArray 是一个依赖属性有关?