When at least one PackageReference project is used, inform when NuGet.exe restore is used and suggest using msbuild /t:restore to match with the build tooling

[nkolev92]

NuGet Product(s) Affected

NuGet.exe

Current Behavior

NuGet.exe project restore is fully supported in msbuild /t:restore, including packages.config.

https://learn.microsoft.com/en-us/nuget/reference/msbuild-targets#restoring-packagereference-and-packagesconfig-projects-with-msbuild

The benefit of using msbuild /t:restore is that you now only need to manage one set of tools. You don't need to bother updating.

Desired Behavior

An information or warning indicating you can use msbuild /t:restore.

Note that the warning's from NuGet.exe do not fail the build, so it can be added without a build failure.

https://learn.microsoft.com/en-us/nuget/consume-packages/install-use-packages-nuget-cli

Another idea would be a warning message when the projects are all SDK. In that cases, the .NET CLI can be used.

Additional Context

Nuget.exe knows all the projects in a solution, so we can easily figure out which tool to recommend based on the list of projects we're restoring.