dotnet run app.cs causes NU1100

[johannes-schmitt]

Describe the bug

On a fresh installation (clean machine), dotnet run app.cs fails to restore nuget dependencies

To Reproduce

1. on a clean computer, install .NET SDK version 10 RC1
2. create a simple file named app.cs with the following content (details should actually be irrelevant)

   Console.WriteLine("hello world");
   

3. run dotnet run app.cs, then the build fails with

   C:\Users\testuser\Desktop\app.csproj : error NU1100: Unable to resolve 'Microsoft.DotNet.ILCompiler (>= 10.0.0-preview.7.25380.108)' for 'net10.0'.
   C:\Users\testuser\Desktop\app.csproj : error NU1100: Unable to resolve 'Microsoft.NET.ILLink.Tasks (>= 10.0.0-preview.7.25380.108)' for 'net10.0'.
   C:\Users\testuser\Desktop\app.csproj : error NU1100: Unable to resolve 'runtime.win-x64.Microsoft.DotNet.ILCompiler (= 10.0.0-preview.7.25380.108)' for 'net10.0'.
   

I assume that the reason is because there are no nuget sources available (confirmed via dotnet nuget config get ALL --show-path and dotnet nuget list source) and the nuget caches are empty. The file %USERPROFILE%\nuget.config does not exist - and once I add one (with https://api.nuget.org/v3/index.json as a packages source) everything works as expected.

Further technical details

details of dotnet --info

.NET SDK: Version: 10.0.100-rc.1.25451.107 Commit: 2db1f5ee2b Workload version: 10.0.100-manifests.0e2d47c4 MSBuild version: 17.15.0-preview-25451-107+2db1f5ee2

Runtime Environment:
OS Name: Windows
OS Version: 10.0.19045
OS Platform: Windows
RID: win-x64
Base Path: C:\Program Files\dotnet\sdk\10.0.100-rc.1.25451.107\

.NET workloads installed:
There are no installed workloads to display.
Configured to use workload sets when installing new manifests.
No workload sets are installed. Run "dotnet workload restore" to install a workload set.

Host:
Version: 10.0.0-rc.1.25451.107
Architecture: x64
Commit: 2db1f5ee2b

.NET SDKs installed:
10.0.100-rc.1.25451.107 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
Microsoft.AspNetCore.App 10.0.0-rc.1.25451.107 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 8.0.20 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 10.0.0-rc.1.25451.107 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 8.0.20 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 10.0.0-rc.1.25451.107 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

Other architectures found:
None

Environment variables:
Not set

global.json file:
Not found

[johannes-schmitt]

I would suggest to use the label Area-run-file, but I can not edit that on my own.

[jjonescz]

File-based app by default references NuGet packages related to its NativeAOT default enablement. You could disable that via #:property PublishAot=false.

A project-based app which references some NuGet packages would have the same error, right? (Or a project-based app with <PublishAot>true</PublishAot> so it's equivalent to the default file-based app.)

cc @DamianEdwards @baronfel @dotnet/run-file

[DamianEdwards]

I'm curious why one would have no configured NuGet sources by default? After a typical .NET SDK install, one would have nuget.org as their default feed.

[johannes-schmitt]

I'm curious why one would have no configured NuGet sources by default? After a typical .NET SDK install, one would have nuget.org as their default feed.

I just tried with .NET 9 SDK. After installing it on a clean machine, dotnet nuget list source reports No sources found.
I can provide install logs if you point me to the right direction

[Shane32]

File-based app by default references NuGet packages related to its NativeAOT default enablement. You could disable that via #:property PublishAot=false.

@jjonescz Is it documented that NativeAOT is enabled by default for dotnet run app.cs? If not, I can open a new issue. (This caused significant headache for me for my first use case, a simple program which used a library that relies on reflection.)