How Can Use Assambly having two diffrent versions

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I have a Assembly with two different versions , i want to use both assembly in our system with different conditions like old version new version, how can maintain
please give me solution.

Thanks

Posted 16-Jun-15 0:23am

Naim_86

Updated 16-Jun-15 0:25am

v2

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F-ES Sitecore · Answer 1 · 2015-06-16T00:37:00

Add each reference and change their default alias. If you find the assembly under the references node and view its properties you'll see it has an alias of "global". Change that to "newDll" for your new assembly and "oldDll" for your old one. You can now explicitly refer to each assembly via;

oldDll::MyNameSpace.MyClass
newDll::MyNameSpace.MyClass

Or use aliasing in the using list at the top of the page

using OldProduct = oldDll::MyNameSpace.Product;
using NewProduct = newDll::MyNameSpace.Product;

then in your code

OldProduct p = new OldProduct

If you want to simply have our code use different versions of the assembly then update the web.config\app.config file appropriately.

Sergey Alexandrovich Kryukov · Answer 2 · 2015-06-16T00:36:00

Solution 1

First of all, I would advise to avoid this situation by all means. Merge all old versions in one, clean up the whole product, don't torture yourself with artificially complicated legacy.

For the resolution of the assembly conflict in the presence of two or more different versions, please see, for example:
http://stackoverflow.com/questions/223195/referencing-different-versions-of-the-same-assembly[^],
http://stackoverflow.com/questions/2460542/using-different-versions-of-the-same-assembly-in-the-same-folder[^].

[EDIT]

Please see the discussion in comments below. Kornfeld Eliyahu Peter reminded me about the extern alias feature. It needs some explanation I tried to provide in my comment below.

—SA

Posted 16-Jun-15 0:36am

Sergey Alexandrovich Kryukov

Updated 16-Jun-15 1:15am

v3

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Kornfeld Eliyahu Peter 16-Jun-15 6:56am

I second the warning against to use two versions of the same assembly! Very problematic...
I would add also this link: https://msdn.microsoft.com/en-us/library/ms173212(v=VS.100).aspx

Sergey Alexandrovich Kryukov 16-Jun-15 7:13am

Thank you very much, Peter.

Technically speaking, .NET is quite capable of using multiple versions and resolution of the references to them and their declarations, but I think this warning should come first.

I forgot to mention extern alias, which I referred to in some past answers. It is absolutely needed in some situations. Say, if assembly A.v1 is used by B, A.v2 is used by C also using B, it is not needed. But if you directly use two assemblies with the same name (two different versions of the same thing or two unrelated assemblies), you need it.

I also need to add that the MSDN documentation is a bit confusing, insufficient. By some reason, under "Visual Studio" documentation, only the compiler's command line option is shown, which is not good enough for Visual Studio use. With Visual Studio, you add one of the references, click on its context menu and introduce one alias name, then do the same with the reference to a different version. Then two alias assembly names can be used in C# as shown in the MSDN example.

I updated my answer.

—SA