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NullReferenceException when changing skin/theme via Application.Current.Resources

Answer 1

A:

In the same link you described above, you must first clear MergedDictionaries and then add. as following.

try 
{ 
    Application.Current.Resources.MergedDictionaries.Clear();
    Application.Current.Resources.MergedDictionaries.Add( resource ); 
} 
catch( Exception ex ) 
{ 

}

The reason you are getting errors on subsequent calls because the dictionaries maintain only one key for one resource its like hashtable and multiple keys might be creating problem if you just keep on adding different themes with same keys defined in them.

Akash Kava 2009-12-30 08:28:40

Thank you for your suggestion. I tried that and it still gives me the same error. Any other thought?

CoolCat 2009-12-30 18:26:02

Can you check that for first time, only one specific theme is giving error or all are giving error?? I can see two possibilities, 1) If animation or any Storyboard is running and if you try to change theme this error might come, 2) If Inherited property becomes null somehow, inherited properties are the ones like TextElement.Foreground etc. Try creating theme one by one, like first create smaller version with only colors changed, then see if everything is working or not, then try adding animations one by one.

Akash Kava 2009-12-31 07:28:25

Answer 2

A:

for me it was the application.current what gave null value, and that has no .resources (or .mainwindow what i actually wanted)

Zéiksz 2010-04-20 09:43:10

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NullReferenceException when changing skin/theme via Application.Current.Resources

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