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RE: WPF: Use MultiBinding to bind end of line to a thumb

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

Delighting our customers is our #1 priority. We welcome your comments and
suggestions about how we can improve the support we provide to you. Please
feel free to let my manager know what you think of the level of service
provided. You can send feedback directly to my manager at:
ms****@microsoft.com.

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Jul 2 '08 #1
1 3165
Linda, Thank you very much. That was it!
"Linda Liu[MSFT]" <v-****@online.microsoft.comwrote in message
news:iM**************@TK2MSFTNGHUB02.phx.gbl...
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

Delighting our customers is our #1 priority. We welcome your comments and
suggestions about how we can improve the support we provide to you. Please
feel free to let my manager know what you think of the level of service
provided. You can send feedback directly to my manager at:
ms****@microsoft.com.

==================================================
Get notification to my posts through email? Please refer to
http://msdn.microsoft.com/subscripti...ult.aspx#notif
ications.

Note: The MSDN Managed Newsgroup support offering is for non-urgent issues
where an initial response from the community or a Microsoft Support
Engineer within 1 business day is acceptable. Please note that each follow
up response may take approximately 2 business days as the support
professional working with you may need further investigation to reach the
most efficient resolution. The offering is not appropriate for situations
that require urgent, real-time or phone-based interactions or complex
project analysis and dump analysis issues. Issues of this nature are best
handled working with a dedicated Microsoft Support Engineer by contacting
Microsoft Customer Support Services (CSS) at
http://msdn.microsoft.com/subscripti...t/default.aspx.
==================================================
This posting is provided "AS IS" with no warranties, and confers no
rights.

Jul 2 '08 #2

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