I have created a database application that stores diagram information in a database. It works great for the most part, but I noticed a bug that made my heart stop when I first encountered it. I found a workaround but I wanted to give you a heads-up about it.

I store the control points for a link in a table and render them when the diagram is loaded using the ControlPoints.Add() and UpdateFromPoints() methods. I also gave the user the ability to add or delete link segments as desired. The problem occurs when the user deletes a segment so the number of segments for a link is less than the Diagram's LinkSegments setting. Wnen this happens, the diagram just becomes a big red "X" surrounded by a red box border. Like I said, heartstopping! The version number of the MindFusion.Diagramming assemby is 5.3.5.25867.

After playing around with the program, I discovered that if I set the Diagram's LinkSegments to 1 that fixed the problem. So I implemented logic like the following to fix:

Dim shtCurrentLinkSegments As Short ' To hold current value of Diagram's LinkSegments
shtCurrentLinkSegments = dgm.LinkSegments
dgm.LinkSegments = 1

<< Diagram rendering logic here >>

dgm.LinkSegments = shtCurrentLinkSegments ' Restore Diagram's original LinkSegments setting


It is interesting that this worked because the links are correctly rendered while the temporary LinkSegments value is in effect and the diagram displays them even after LinkSegments is reset to the original value.

Yes! Much better. After I posted about the 'bug' I realized my fix did not render the diagram correctly if it contained more segments than the LinkSegments setting. But using the 2-parameter UpdateFromPoints() method seems to have fixed everything.

So there is no bug. Feel free to remove this thread from the 'Bug Report' as it is just clutter.

Thanks loads.