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We upgraded our .net 3.5 projects (c#) to .net 4.0. When you look at the project file there are two tags that I’m trying to make sense out of:
<RequiredTargetFramework>3.5</RequiredTargetFramework>
<TargetFrameworkVersion>4.0</TargetFrameworkVersion>
Why are there two seemingly similar tags with different values?
The
<RequiredTargetFramework>element was already present in your 3.5 project. It’s associated with the assembly<Reference>and only present on assemblies that are not available in .NET 2.0I don’t buy much stock in the single mention of it in MSDN, I don’t see how batch building has anything to do assembly references. Nor is it used in any of the 3.5 MSBuild .target files. I think the IDE simply uses it to put the warning icon next to the reference in the References node when you change the Target Framework to a version less than what’s needed to support the assembly.
There are other elements like this in a project file that don’t affect MSBuild but have an effect in the IDE. Like
<SubType>and<DependentUpon>in the<Compile>element.