Apologies in advance for the possible flame thread, but that’s not what I’m going for.
I’ve only ever done serious development in Linux using C and C++, and I’m looking to take the plunge into Windows. I’ve been doing some reading and asking around, and it seems to me that .NET with C# is the way to go for developing commercial user-oriented business applications for Windows.
A big consideration for me is the integration of the user interface into the desktop, since this is what the user ultimately interacts with. Is it possible to recreate the look of the Office 2007 GUI in Java, for example, or is this only possible with .NET?
I’m also concerned about portability. In the future, I may want to port the application to Linux. I know about the mono project, but I’m wondering if it wouldn’t be better to go with Java.
In short, what are the trade offs between Java and C# when developing commercial, user-oriented business applications primarily intended for Windows?
The most important bit is in “primarily intended for Windows”.
If you only need to work on Windows, C# is likely to be a much better bet than Java. There’s a better variety of visual styles which blend in well with Windows. It also makes interoperating with native code (e.g. bits of the Win32 API or COM libraries) easier than Java. Personally I prefer it as a language, but that’s a different matter.
If you need to run on other platforms, I’d seriously consider Java. While Mono has quite a lot of momentum, it doesn’t have the same degree of compatibility with .NET as Java does on the various platforms it supports.
So basically, weigh up the “may want to port” aspect very carefully – it’s the driving factor in the decision, from my point of view. Once you’ve decided to do a port, it doesn’t matter much if 90% of your customers are on Windows – it’ll still need to work, and work well, for the remaining 10%.