Most restrictions and tricks with windows forms are common to most programmers. But since .NET 3.0 there is also WPF available, the Windows Presentation Foundation. It is said that you can make "sexy applications" more easy with it and with .NET 3.5 SP1 it got a good speed boost on execution.
But on the other side a lot of things are working different with WPF. I will not say it is more difficult but you have to learn "everything" from scratch.
My question: Is it worth to spend this extra time when you have to create a new GUI and there is no time pressure for the project?
We are currently rewriting our application in WPF from Windows Forms. Yes, there is a steep learning curve and you have to "re-learn" some things, but it is so worth it. And combined with WCF, we are finding we are writing less code, faster, and more robust than ever before.
Stick with it for a while, read Adam Nathan's book, and check out the ever growing library of third-party controls like those from Telerik and ComponentOne. One negative, in my view, is that the design tool, Expression Blend, is very awkward to use. The latest version is still in beta, but it just doesn't feel right to those of us who have used Visual Studio for years. Yes, it's mainly for designers, but some things you just can't do in Visual Studio.
The programming model for WPF is more open and flexible than Windows Forms is, but like ASP.NET MVC, it requires a little more discipline in terms of correctly implementing Model-View-ViewModel patterns.
My first LOB application with WPF ended up as an utter failuire, because it was a resource hog which brought my end-user's very-low-end laptops grinding to a halt... and this was ultimately because I just lept in with WPF + LINQ to SQL and expected a good result... and this is where WPF diverges so strongly from Windows Forms... In Windows Forms, you can get away with that sort of thing. WPF is much heavier on resources than Windows Forms, and if you don't architect your application to be lean, you end up with a 800-pound gorilla.
Don't shy away from WPF... explore it. But be aware that the acceptable sins of Windows Forms coding won't produce good results in WPF. They're fundamentally different engines, which lend themselves to fundamentally different coding patterns.
Last Word: If you do go ahead with WPF, get well acquianted with data virtualization for use with lists and grids. What is a simple data-bound ListItem or GridCell ends up being a hefty logical + visual object-graph in WPF, and if you don't learn how to virtualize, you application won't perform well on large data sets.
I think it is worth learning WPF. Once you are up to speed, design work on your forms is much easier IMHO. I wouldn't worry as much about the 'sexy' stuff. Most of this is just a fad. You can make 'normal' Winforms-style applications very quickly and easy in WPF.
The whole concept lends itself to easier design IMO.
There is a known issue with text rendering in WPF. Many users report that the heavy use of anti-aliasing and pixel-blending used causes blurry text. This is a big deal breaker in some circumstances and, as far as I know, has been acknowledged by Microsoft at some level.
If you only care about supporting Windows and don't mind the time it takes to learn it, go with WPF. It's fast, flexible, easy to reskin, and has great tools to work with it.
After three months of trying to hammer out a line-of-business (LOB) application on WPF, I reached a point of considering turning back to Windows Forms for my project, and in researching other people's opinions, came across this thread...
Yes, WPF is a brilliant technology and it has benefits that span far beyond mere eye-candy... the templating and binding capabilities are great examples. The whole object model offers more flexibility and broader possibilities. That doesn't, however, make it the defacto platform for future LOB applications.
The "problems" which WPF solves in terms of separating GUI from business logic aren't problems which can't be readily solved in Windows Forms by simply starting with the right architecture and mind-set. Even the object-path binding capabilities of WPF can be reproduced in Windows Forms with some very simple helper classes. The data template capabilities of WPF are very nice, but again they're nothing that you can't simulate in Windows Forms on those rare occasions when you absolutely don't know exactly what objects you're going to represent on any given part of the screen.
Where Windows Forms races ahead is in terms of maturity. You can't swing a dead cat on Google without hitting some blog where someone has solved a Windows Forms problem for you. WPF, on the other hand, has comparatively less learning resources available, fewer custom controls available, and hasn't had as many of its teething problems solved.
At the peak of making a WPF vs Windows Forms decision has got to be the maturity of the development environment. Windows Forms editors are slick, responsive and intuitive. Feedback about errors gets to you instantly, the solutions are usually obvious, and the compile->debug->edit cycle in Windows Forms is very quick.
WPF applications, on the other hand, have comparatively pathetic design time support, with the design view all-too ready to chicken out at the first encounter of an error, often requiring a project build after the fix before the designer is willing to kick in again. Drag'n'drop of components from the toolbox might as well not be supported, given the vast range of circumstances under which it either doesn't work at all, or yields completely unintuitive results. Despite the promise of the WpfToolkit, there still isn't a usable DataGrid for WPF that yields any kind of resonable performance or design time friendliness.
Debugging WPF applications is a bit like the old ASP.NET debugging paradigm... hit F5 -> wait -> launch -> error -> stop -> fix -> hit F5 -> wait -> launch -> error -> groan -> stop -> fix -> hit F5.... All XAML which your program is running is locked, and tracking down XAML specific problems is often tedious.
The bottom line, simply put, is that the development tools for Windows Forms are going to have you banging out front-ends in a fraction of the time of a WPF application... especially if you're creating master-detail grids or spreadsheet like interfaces, which most LOB have. With Windows Forms, you start with 90% of the work already done for you.
I'm a huge fan of the WPF architecture. I just wish the design-time tool-set didn't feel like a pre-alpha debug-build.
Edit: This answer was posted about .NET 3.5 + Visual Studio 2008, but .NET 4.0 with Visual Studio 2010 ships with a WPF data grid. While many improvements have been made to the new WPF development experience, my answer here remains unchanged, and I'd like to add the following suggestion:
If you're in a rush to do RAD development, go with Windows Forms. If you're looking to produce a well architected, maintainable, scalable, resource firendly, multi-user Line-Of-Business application, consider ASP.NET MVC + HTML 5 + jQuery... My projects with these technologies have resulted in better outcomes, sooner, for my customers. MVC offers all of the same templating that WPF does, and jQuery enables animations and complex interactions. More importantly, an ASP.NET MVC + jQuery solution doesn't require your end users to have modern desktops with decent graphics hardware.