.NET Framework和兼容性

Question

We have a case where 2 .NET applications are running on the same computer, A is built for 4.6.1 and B is built for 4.5. This means that we have to install .NET framework 4.6.1 for A but this breaks a certain part(printing) of application B. Application B will have to be fixed but in the meantime, how do we solve this? I have read this article: https://docs.microsoft.com/en-us/dotnet/framework/migration-guide/version-compatibility

It states that I should set the supportedRuntime like this:

<configuration>
   <startup>
      <supportedRuntime version="v2.0.50727" />
      <supportedRuntime version="v4.0" />
   </startup>
</configuration>

But will this really solve my problem? Is 4.6.1 containing 4.5 as a whole as well?

Answer 1

You cannot run 4.5 on a machine with 4.6.1 installed. It doesn't make sense the question. The 4.6.1 version of the .net framework will be loaded, since those are the only libraries you have installed. 4.6.1 is meant to have a library that has every function of the 4.5 library, but in practice 4.5 was a buggy piece of crap, and a lot of bugs were removed. Of course one man's bug is another man's feature....

So in short if you are using the 4.5 framework API, you have no problems.

However if you are relying on a 4.5 bug, you are stuffed.

More to the point, 4.5 is no longer supported.

Update: .net Core v1.0 has gone live.

The framework for .net Core is deployed by nuget, so you can use multiple versions for that. You could install .net 4.5 and .net Core 1.0 concurrently, and it might solve your problem.