How can I specify the assembly version loaded when running

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I have created a app using csharp and vs.The project targets to 4.5.1 and it refers to mscorlib.dll assembly, but when I run the app ,The loaded mscorlib.dll version is 4.7.2 . I dont know why and how can I sepcify the right version of assembly.
In face I just want the app load the 4.5.2 version assembly like mscorlib.dll or other strong named assemblyies.
Thank you so much.

What I have tried:

I have looked up the assemblies in VS when debugging.

Posted 15-Jan-18 19:02pm

codeprojectddx

Updated 16-Jan-18 4:48am

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Kornfeld Eliyahu Peter · Answer 1 · 2018-01-16T00:28:00

Solution 1

You can use 'Specific Version' and 'Copy Local' on your reference node in your project to force to use a specific version of an assembly, however in this case you have to deploy that assembly with your application (maybe it is not on the target machine)...

And by the way: why?

Posted 16-Jan-18 0:28am

Kornfeld Eliyahu Peter

Comments

codeprojectddx 16-Jan-18 11:39am

Thank you . I wanted to debug .net 4.5.1 in vs. To keep source code and loaded dll match each other , I think load specified version dll is a good idea.
Now i have got the specified version dll ,the version is about file version . But I have no idea how to load it other than gac dll.

Richard Deeming · Answer 2 · 2018-01-16T04:48:00

Solution 2

Since v4.0, each new version of the .NET Framework has been released as an "in-place upgrade", replacing any previous v4.x install.

Therefore, if you compile your application against v4.5, and run it on a computer with v4.7 installed, your application will be running under v4.7, and it will load the v4.7 versions of the system assemblies.

There is nothing you can do to change that, and there shouldn't be any reason for you to do so. Microsoft go to great lengths to ensure that each new version is backwards-compatible with the previous versions. In cases where the behaviour changes between versions, applications compiled against older versions typically get the older behaviour.

If you believe you have found a genuine case where your v4.5 application is broken when running under v4.7, then you'll need to report it to Microsoft.

Posted 16-Jan-18 4:48am

Richard Deeming

Comments

codeprojectddx 16-Jan-18 11:43am

Thanks a lot .I doubt that i have never install .net framework 4.7.2 but when running the exe , it will load the 4.7.2version dll .Why?
PS:I really hope my application well be running under v4.6 or lower.

Richard Deeming 16-Jan-18 11:47am

If it's loading v4.7.2 system assemblies, then your computer has v4.7.2 installed. If you didn't install it, then it's probably snuck in via Windows Updates.

codeprojectddx 16-Jan-18 18:03pm

now i am looking for a way to uninstall version 4.7.2

Richard Deeming 17-Jan-18 7:11am

Why? If it's broken something, then you should report the bug to Microsoft. If it hasn't broken anything, then why uninstall it?

codeprojectddx 17-Jan-18 9:35am

now i have 4.7.1 source code,i want my app which targets .net 4.7.1 to run and load the same version assembly of 4.7.1 not 4.7.2 assembly

Richard Deeming 17-Jan-18 10:34am

As we keep telling you, you can't do that!

If you have found a breaking change which the compatibility shims don't automatically handle for you, then report a bug to Microsoft.

If you haven't, then don't worry about it. Just let the framework handle the compatibility for you.

codeprojectddx 17-Jan-18 12:24pm

My god . Now i just want to unistall .net 4.7.2 ,and I have not installed this version .net framework. But it is there ,the os is win10.Why can not I unstall?

Richard Deeming 17-Jan-18 14:20pm

Because it's part of Windows. If you want an earlier version, you'll need to roll-back to an earlier version of Windows.

But once again, WHY???

Unless you've identified a specific problem with 4.7.2, then what difference do you think it's going to make?

codeprojectddx 17-Jan-18 18:29pm

i am gonna debug net framework source code in vs ,so i need that the source code version is the same with dll.now the source code is 4.6.1 ,i need 4.6.1 dll such as mscorlib.dll to be loaded not 4.7.2.
apologise for my poor english