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Roger
1052
Null Reference when Drilling Down
posted

Hi There,

I am using a tree map to show some hierarchical data, which you can drill down with. I'm getting a strange bug when drilling down to some of my nodes where the error message shows Object not set to a reference...

I had a brief look at the code and it seems to be when the TreemapNodeInfo if trying to find the LastParentNode.

When I am drilling down, I set a flag on my object before I set that object as the ItemSourceRoot, and this seems to contribute to the error. If I don't set this flag then the error doesn't seem to occur.

I have created a simple demo of this behavior which is attached. If you drill down (click) on most of the nodes it is fine, however if the first node you click on is M the error occurs, it also happens sometimes if you drill down on M twice.

Any help on this problem would be greatly appreciated.

TreeMap.zip
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  • 895
    posted

    Hello,

    It seems that this behaviour is a bug in the Treemap control. The flag that you set raises PropertyChanged event - when this event is raised, the Treemap updates its mappings, but at the same time the ItemsSourceRoot has to be changed. I believe that this is causing the null object. I reproduced the issue by commenting the flag and only calling tag.NotifyPropertyChanged(<any Tag property>).

    I have submitted a bug about this issue - bug 80872.

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