Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
Can a .net 3.5 c# project reference a .net 4.0 assembly and compile with it?
What about run time?
What about 4.0 compiling / running with 3.5?
EDIT: in particular, I have a 3rd party .net assembly. It has extension points: I register my dll in app.config and it calls me (probably via reflection). Can I implement my dll in .net 4.0? when is the CLR version chosen, when the main exe comes up or when a dll needs some version of it?
A .net 3.5 application needs to be retargeted at te 4.0 framework to become a .net 4.0 application and use .net 4.0 features. This shouldn’t break anything (apart from requiring .net 4.0 on your user’s PCs), but will allow you to start using .net 4.0 features.
You can retarget a .net 4.0 app down to 3.5 iff it doesn’t use any .net 4.0 features. If it does, you will need to rewrite those bits of your code to work with .net 3.5.
Targeting a particular .net version is trivial – it’s done by choosing the version from a drop-down list in your project properties.