Visual Studio needs to make non-functional changes to this project

Question

I opened a C# project that was created in VS 2010 SP, with VS 2012. A one-way conversion window appeared where I proceeded with the conversion.

Upon completion I got

Answer 1

I've solved the problem in VS2013 in a big multi project via opening the .csproj file and changing this

<FileUpgradeFlags>
</FileUpgradeFlags>

like this

<FileUpgradeFlags></FileUpgradeFlags>

Answer 2

Change this line from True to False

<SaveServerSettingsInUserFile>True</SaveServerSettingsInUserFile>

<SaveServerSettingsInUserFile>False</SaveServerSettingsInUserFile>

Answer 3

Removing the content of the nodes 'FileUpgradeFlags', 'OldToolsVersion' in the .csproj File solves the Problem.

<FileUpgradeFlags></FileUpgradeFlags>
<OldToolsVersion></OldToolsVersion>

Answer 4

If you look into the .csproj file, you will see this:

< Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props"     

 Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />

and

< OldToolsVersion>4.0< /OldToolsVersion>

Answer 5

In our case, removing the following 2 settings elements in the project file that was triggering the upgrade fixed the problem:

Child element of Project/PropertyGroup:

<ProductVersion>8.0.50727</ProductVersion>

Child element of Project:

<Import Project="$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\WCF\Microsoft.VisualStudio.ServiceModel.targets" />

Answer 6

I'm unsure as to why exactly this happens but I found that after first opening a VS2010 SharePoint 2010 project in VS2012 amongst other changes the following nodes were added to the .csproj file:

<ProjectMode>SharePointCustomization</ProjectMode>
<TargetOfficeVersion>15.0</TargetOfficeVersion>
<FileUpgradeFlags>0</FileUpgradeFlags>
<UpgradeBackupLocation>blah\blah\blah</UpgradeBackupLocation>
<OldToolsVersion>4.0</OldToolsVersion>

I found that if I manually edited the csproj file and removed the following three nodes the next time I opened the project no upgrade logs opened and the issue was resolved:

<FileUpgradeFlags>0</FileUpgradeFlags>
<UpgradeBackupLocation>blah\blah\blah</UpgradeBackupLocation>
<OldToolsVersion>4.0</OldToolsVersion>