How to force .NET 3.5 application run on .NET 4.5 runtime?

Question

I'm trying to implement the solution described here: Can I use a .NET 4 feature while targeting .NET 3.5 SP1?. It works fine when a .NET 3.5 application runs on .NET 4.0. However, on .NET 4.5 the app runs on .NET 3.5 environment. I have tried the following:

<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5"/>
<supportedRuntime version="v4.0"/>
<supportedRuntime version="v2.0.50727"/>

with no success. Environment.Version still tells 2.0.50727.5456 while on .NET 4.0 everything is OK.

Is there a way to force .NET 3.5 app use .NET 4.5 if available?

is this local or on IIS if IIS you could try adding it to a 4.5 pool — j_mcnally, Sep 26 '12 at 23:58
All: I'm developing a desktop app in VS2010 targeting .NET 3.5 and I want it be able on run on 3.5, 4.0 and 4.5. I want the app to be actually run on .NET version as higher as possible on the user's machine. — eigenein, Sep 27 '12 at 01:03

score 7 · Accepted Answer · answered Sep 27 '12 at 01:19

7

It's my fault: app.config accidentally was not copied onto build directory. Everything works with:

<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5"/>
<supportedRuntime version="v4.0"/>
<supportedRuntime version="v2.0.50727"/>

answered Sep 27 '12 at 01:19

eigenein

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for me its not working.how u generate and name your config file.I am also trying same but no luck.help me – Vikram Ranabhatt Jun 30 '14 at 13:49

How to force .NET 3.5 application run on .NET 4.5 runtime?

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