Null Reference Exception when clearing content from flowdocument

Asked Jan 27 '13 at 14:17

Active Jan 28 '13 at 12:50

Viewed 294 times

I am clearing content from FlowDocument using Dispatcher.The code is in non UI assembly. The code is

     Application.Current.Dispatcher.BeginInvoke(DispatcherPriority.Normal, 
         new Action(delegate()
    {

    _flowDocument.Blocks.Clear();
    }

However I am facing null reference exception whenever this code executes.

Well I already have a thread (forgot about it while posting the question) to perform operations on FlowDocument, So I just need to call the above mentioned code using a delegate .

edited Jan 28 '13 at 12:50

casperOne

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asked Jan 27 '13 at 14:17

Ram

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3

Have you tried to use _Invoke_ instead of _BeginInvoke_? & Where _flowDocument is set in your code? – Cédric Bignon Jan 27 '13 at 14:27
Yes I did but no help. It is class level variable and I am creating its new instance in one of the private methods. – Ram Jan 27 '13 at 14:48
When you debug, is __flowDocument_ _null_? or _Blocks_? – Cédric Bignon Jan 27 '13 at 14:52
Nothing is null... still getting this exception – Ram Jan 27 '13 at 16:43
In this case, you will have to give us more information about our code. – Cédric Bignon Jan 27 '13 at 16:49
1

One of these is null: _flowDocument, or Blocks. Check for flowDocument != null first, then flowDocument.Blocks != null. – John Saunders Jan 28 '13 at 11:22
@Ram, if any of this is not null - then you have some thread that sets _flowDocument or Blocks variables to null, and this happens in debugging. Try to find all places where this two variables can be set to null, or perhaps ctors. – zabulus Jan 28 '13 at 13:07

Null Reference Exception when clearing content from flowdocument

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