Hi George,
I have downloaded your sample project and built it on my machine. When I
start the application and click the Button on the window, I get an
InvalidCastException on the line of code "double topLeft =
(double)values[0];" in the Convert method within the LineBindingConverter
class.
I look into the parameter "values" and find the first element in it is of
type DependencyProperty.UnsetValue. Open the source code of the Window1 and
I find the reason that causes this error, i.e. the Thumb class doesn't have
a Left or Top property. They are attached properties of Canvas.
Modify the two lines of code in the BindLine method as follows and the
problem should be solved:
// bindingX.Path = new PropertyPath("Left");
bindingX.Path = new PropertyPath("(Canvas.Left)");
// bindingY.Path = new PropertyPath("Top");
bindingY.Path = new PropertyPath("(Canvas.Top)");
Please try my suggestion and let me know the result.
Sincerely,
Linda Liu
Microsoft Online Community Support
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