Your project does not reference ".NETFramework,Version=v4.5" framework. Add a reference to ".NETFramework,Version=v4.5"

Question

Visual Studio Version: 2019 Summary: I have two framework projects in same folder, 4.7 framework project has local Nuget Package reference and 4.5 framework project has local Assembly reference. The reported issue occurs when run 4.5 project after run the 4.7 projects

Issue: Severity Code Description Project File Line Suppression State Error Your project does not reference ".NETFramework,Version=v4.5" framework. Add a reference to ".NETFramework,Version=v4.5" in the "TargetFrameworks" property of your project file and then re-run NuGet restore.

4.7 Project

  <ItemGroup>
   <PackageReference Include="Microsoft.Xaml.Behaviors.Wpf" Version="1.1.19" />
</ItemGroup>

4.5 Project

<Reference Include="Microsoft.Xaml.Behaviors.Wpf" xmlns="">
  <HintPath>..\resources\Assembilies\Microsoft.Xaml.Behaviors.dll</HintPath>
</Reference>

Steps to Reproduce:

Run 4.7 project with nuget reference
run 4.5 project with assembly reference
will reproduce the reported issue

How to solve this issue

Seems legit, .net framework only supports backward version compatibility. On the first run Microsoft.Xaml.Behaviors.dll is generated in 4.7. It is not overriden on the second run so it crashes. — B. Lec
– B. Lec, Commented Sep 1, 2020 at 13:00
@B.Lec Cleaning bin and Obj fix the issue but it needs to be calls before the build Starts — max
– max, Commented Sep 1, 2020 at 13:03

Ricky Gummadi · Accepted Answer · 2021-12-21 02:49:35Z

27

If anyone is ever stuck on a legacy project, the solution in the end was to delete the contents of bin and obj folders, and the .vs directory for the solution.

edited Dec 21, 2021 at 2:49

answered Oct 26, 2021 at 3:54

Ricky Gummadi

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1 Comment

Vadim Over a year ago

this helped for me: I removed .vs, bin, obj from the source folders for every assembly mentioned in the errors (not entire solution).

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