Please take a look at the section Autofitting Merged Cells at page 13 in the TMS Flexcel Studio for .NET - API Developers Guide

Nancy Lescouhier (Mar 2, 2012)

To run FlexCel under mono, you need:

1) A registered FlexCel.dll. Trial might or might not work due to higher levels of code obfuscation.
2) A recent (2.10 or newer) Mono installation.
3) Gdiplus. This might or might not be installed with the default mono installation.


If you get the following Exception:
Runtime Exception: An exception was thrown by the type initializer for FlexCel.Core.TThemeColorScheme
Then you most likely don't have GDIPlus installed

Adrian Gallero (May 30, 2011)

Update to FlexCel 5.7 or newer. FlexCel used to use the classes in System.IO.Packaging to create xlsx files. When the generated xlsx file got too big (about 7mb), it would create a temporary file in the isolated storage. In version 5.7 we have rewritten the System.IO.Package classes in native C#, that doesn't use isolated storage at all, so you shouldn't get this error anymore.

As a side advantage, the newer classes are faster since they write directly to the actual file, instead of writing a temp version to the isolated storage and then copying from the isolated storage to the real file.

Adrian Gallero (May 30, 2011)