• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 330
  • Last Modified:

Can a VS 4.0 framework app consume a VS 4.5 framework DLL?

I am building a DLL for my office and it needs to use Async (a 4.5 framework tool).  Many of our programs that use this DLL are 4.0 framework apps.  So can I put async in the DLL and still have those programs use the methods that have async in them (BTW, no 4.5 objects will be returned to the calling program)?
0
David L. Hansen
Asked:
David L. Hansen
  • 2
1 Solution
 
Craig WagnerSoftware ArchitectCommented:
Unless the machine on which the code is running has been upgraded to 4.5 then no, it won't work. The CLR has to be able to understand and execute the code in the assembly. If the execution environment only has 4.0 then you'll have to use one of the older approaches to doing asynchronous operations.
0
 
käµfm³d 👽Commented:
This is total speculation, but the async and await keywords are just syntactic sugar for the compiler to create a state machine for you. Since async methods return Task<T>, and Task was introduced in .NET 4.0, it may be possible. It could be worth putting together a quick throw-away project to test.
0
 
David L. HansenProgrammer AnalystAuthor Commented:
I'm thinking that the machine running the consuming program would implement the DLL alright, even if that program was a 4.0 framework program, so long as the 4.5 framework was installed on that machine.

Sorry for the delay in responding guys.
0
 
David L. HansenProgrammer AnalystAuthor Commented:
Thank you very much
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Featured Post

Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

  • 2
Tackle projects and never again get stuck behind a technical roadblock.
Join Now