I am in the process of testing a program (class library). The class library (dll) is testing on various systems: .NET Frameworks 3.0, 3.5 and 4.0. Is it possible to test it on .NET 3.0 and 3.5 without having to upgrade the .NET version?
No you can not do that, but its the other way around, you can test 3.5 dll on .Net framework 4.0. An assembly compiled with .NET 4.0 can be loaded only by the CLR 4.0
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I have a DLL(Say FileWrapper.dll) that is build using .Net Framework 4.5 (Build for linux)
Is it possible to build a console application (in .Net Core 2.2 - For Linux) that has references FileWrapper.dll and use various functions within in FileWrapper.dll.
Any pointers or past experience is helpful.
Building .net core 2.2 console app for Linux using dll build in .Net Framework 4.5
No Code specific
Hoping to build .net core console app that uses a dll build in .net framework 4.5
Yes, this is possible and was introduced with the .NET standard 2.0 which is supported by .Net Core 2 and .Net Framework 4.6.1. The concept is described is called a "compatibility shim" in .Net Standard 2.0. Here are a couple of links to get you started
Building a Compatibility Shim with .Net Standard 2.0
stack overflow - Compatibility shim used by .Net Standard 2.0
I am newbie to the .NET Framework. I have some a question about .NET program execution.
If I am developing a .NET application using .NET Framework version 4.0, can that application be run on .NET framework 3.5 ? Are there any compatibility issues are there?
For example If I develop a dll using .NET framework 4.0, can it be referenced by another programme which is using .NET framework 3.5?
.Net Framework is generally backward compatible, so you can load a .Net 3.5 assembly in a .Net 4 runtime, but not vice-versa.
You should target your assemblies at the lowest supported version of the runtime.
Here is some additional reading that should answer most of your questions...
https://msdn.microsoft.com/en-us/library/ff602939(v=vs.110).aspx
No, you cannot reference a DLL compiled in .NET 4.0 from a program compiled in .NET 3.5. .NET Framework applications are usually backward compatible -- that is, you can reference a .NET 3.5 assembly from .NET 4.0 code, but the reverse is not true.
You could try compiling the .NET 3.5 project in 4.0, or compiling the .NET 4.0 assembly in .NET 3.5, either of which will work if they are an option.
I am newbie to the .NET Framework. I have some a question about .NET program execution.
If I am developing a .NET application using .NET Framework version 4.0, can that application be run on .NET framework 3.5 ? Are there any compatibility issues are there?
For example If I develop a dll using .NET framework 4.0, can it be referenced by another programme which is using .NET framework 3.5?
.Net Framework is generally backward compatible, so you can load a .Net 3.5 assembly in a .Net 4 runtime, but not vice-versa.
You should target your assemblies at the lowest supported version of the runtime.
Here is some additional reading that should answer most of your questions...
https://msdn.microsoft.com/en-us/library/ff602939(v=vs.110).aspx
No, you cannot reference a DLL compiled in .NET 4.0 from a program compiled in .NET 3.5. .NET Framework applications are usually backward compatible -- that is, you can reference a .NET 3.5 assembly from .NET 4.0 code, but the reverse is not true.
You could try compiling the .NET 3.5 project in 4.0, or compiling the .NET 4.0 assembly in .NET 3.5, either of which will work if they are an option.
I have a module which is using .Net 4.5 features and our application works for XP users also. So I was thinking of moving this .net 4.5 dependent module to separate project. How can I have a solution which is having two projects targeting to different version?
Each project in a solution is targeting it's specific version of .NET, so there is nothing special to that, BUT you can NOT reference that project/module targeting .NET 4.5 from the .NET 4.0 project.
If you need to target .NET 4.5 for some module your main application must also target .NET 4.5, so if there is no way around that features you need to ditch XP support, which is IMO not a bad thing as XP is not a supported OS anymore.
IF that feature from .NET 4.5 is the async/await-feature you could use the Microsoft.Bcl.Async-package an keep targeting .NET 4.0...
I have an assembly that is compiled with .NET 3.5. I cannot recompile it in .NET 4.5 since it is used in other applications that are still running .NET 3.5. When I use the assembly in my apps that are running .NET 4.5 will the assembly be treated as if it is running in .NET 4.5 instead of .NET 3.5? I have a WinForms app and a WebForms app both in .NET 4.5. If there are changes in behavior between .NET 3.5 and .NET 4.5, with the assembly return the 4.5 results?
Usually .Net frameworks are backward-compatible, so executing an assembly developed in .Net 3.5 shouldn't be a problem on 4.5.
You should see: Version Compatibility in the .NET Framework
The .NET Framework 4.5 is backward-compatible with applications that
were built with the .NET Framework versions 1.1, 2.0, 3.0, 3.5, and 4.
In other words, applications and components built with previous
versions of the .NET Framework will work on the .NET Framework 4.5.
But there could be problems as well like the one mentioned in the article :
However, in practice, this compatibility can be broken by seemingly
inconsequential changes in the .NET Framework and changes in
programming techniques. For example, performance improvements in the
.NET Framework 4 can expose a race condition that did not occur on
earlier versions. Similarly, using a hard-coded path to .NET Framework
assemblies, performing an equality comparison with a particular
version of the .NET Framework, and getting the value of a private
field by using reflection are not backward-compatible practices. In
addition, each version of the .NET Framework includes bug fixes and
security-related changes that can affect the compatibility of some
applications and components.
The best way for you would be make sure your test cases pass after including dll from 3.5.