>>>>Hi,

FormattedText ft = new FormattedText("Hello", CultureInfo.CurrentCulture, FlowDirection.LeftToRight,
>>>>new Typeface("Verdana"), 100, Brushes.Black);
>>>>double d = ft.MinWidth;

Second line throws a ArgumentNullException. Stack trace shows MS.Internal.TextFormatterImp.VerifyTextFormattingArguments(.....) Value cannot be null. Parameter name: textSource. Works fine IF DrawingContext.DrawText(ft,0,0) is executed between the two lines.
>>>>Anyone?
>>>
>>>That is really a weird one.
>>>
>>>What's even weirder... if I hover over and browse the properties for ft in vs... it doesn't throw the error.
>>>
>>>Thought it might be timing, but that wasn't it.
>>>
>>>I added an able to reproduce response to your bug report.
>>
>>Thx. I also notices the behaviour you mention - inspecting the value in the debugger doesn't throw the exception and shows a valid double.
>> Guess we'll have to wait and see what MS say about this one :-{
>>
>>Update: Just see MS has replied - fixed in .NET4. No workaround though......
>>
>>Best,
>>Viv
>
>Glad to hear it will be fixed in .NET 4
>
>I didn't have time to dig deeper... seems that inspecting the object would be a clue to a possible work around. I didn't have time to dig deaper into it though. Also wonder if it throws the error in a release version. Didn't have time to test that one either.

I meant to check that it's OK in the VS2010 beta but didn't have time. But I suppose we can trust MS on this one. Interesting that the post back in 2007 was the only prior reference I could find on this issue and that MS had marked is as not reproducible.....
Oh well, onwards.....