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NET 4.5 and run it on the 4.0 runtime – that is until you hit a new feature that doesn’t exist on 4.0. NET 4.5 like aync/await buried deep in the bowels of the application where it only fires occasionally. NET will happily start your application and run everything 4.0 fine, until it hits that 4.5 code – and then crash unceremoniously at runtime. NET 4.5 like this This works to ensure that the app will refuse to start on . The following code block (dumped into the awsome Linq Pad): Pretty close, eh? The two 3.x versions were basically library enhancements on top of the core . When you build a new project with Visual Studio 2011, you can still target . What's different is the compiler used to compile and link your code so compiling with . Most of the IO APIs have been updated to support task based async operation which significantly affects many existing APIs. NET versions onto Windows machines as part of system upgrades (which currently doesn’t happen). NET 4.5 is an in-place replacement, but administrators and IT folks not intimately familiar with .
NET 4.0, but only has a few of the new features of . Specifically you can specify that the app requires . NET 2.0 and 3.0/3.5 which all ran on the 2.0 version of the CLR. NET 2.0 runtime which wasn’t changed (other than for security patches and bug fixes) for the whole 3.x cycle. NET 4.0 runtime and leaves the actual version number set at v4.0.30319. But you are in effect referencing the same set of assemblies for both regardless which version you use. NET 2.0, 4.0 and at some point 5.0 runtimes) has its own set of challenges, but doing an in-place update of the runtime and then not even providing a good way to tell which version is installed is pretty whacky even by Microsoft’s standards. NET 4.5 includes a fairly significant update with all the aysnc functionality baked into the runtime. NET that ships with Windows 8 so it will be with us for a long time to come unless Microsoft finally decides to push .
As a result, some of the data in the destination fields may be truncated (deleted).
The section Restrictions on data type conversions lists the ways in which you can and cannot convert data types.
But there's so much more than backwards compatibility that makes this awkward at best and confusing at worst. NET 4.0 (right): Clearly they are different files with a difference in file sizes (interesting that the 4.5 version is actually smaller). Recently the EF team got called out on it, and they seem to be in the process of getting their act together, recently it's simply been 4.2, 4.3 etc. NET itself is a mess, let's hope they rebase at 5.0 and then get it right. While this WILL cause all sorts of goofy problems and headaches for developers, the REAL problem here (as I see it) is that it delivers a huge NEGATIVE blow to the .
While 100% backwards compatible sounds great, we all know that 100% is a hard number to hit, and even the aforementioned blog post at the Microsoft site acknowledges this. You end up with overwritten assemblies as well as a bunch of new ones (like the new System. NET 4.5 on the right and my production laptop running stock . NET 4.5 you'll also see: Notice that the file version is also left at 4.0 I suppose they had the ambition to release a "3.0/3.5 release", but realized they wanted to add all those new Task-based API:s into existing assemblies, rather than adding lots of System. Only Hanselman and Haacked seem to get it, which is reflected in Nu Get and MVC.
Add your service interface to the newly created project: As you can see there is not much new to implementing the service, but now it’s time for the client!