`aspire update` doesn't fully upgrade sdk

[afscrome]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

I ran aspire update on my project (and after working around #11453), I get build warnings when I try to dotnet build my project

S:\REDACTED.Aspire\src\REDACTED.Aspire.AppHost\REDACTED.Aspire.AppHost.csproj : warning MSB4240: Multiple versions of the same SDK "Aspire.AppHost.Sdk" cannot be specified. The previous
ly resolved SDK version "9.4.0" from location "S:\REDACTED.Aspire\src\REDACTED.Aspire.AppHost.Tests\REDACTED.Aspire.AppHost.Tests.csproj" will be used and the version "9.5.0-preview.1.2
5466.3" will be ignored.

Expected Behavior

No response

Steps To Reproduce

It think this is caused by having multiple AppHosts (or in my case an AppHost and a test project) in the same solution. aspire update only updated the sdk for one project, but now msbuild gets very unhappy that there are conflicting versions across the solution.

Exceptions (if any)

No response

.NET Version info

9.5.0-preview.1.25466.3+4304e9ce74ab0a02ebabb643e9c32195c1f14b16

.NET SDK:
 Version:           8.0.414
 Commit:            62977d44a9
 Workload version:  8.0.400-manifests.a964dcb3
 MSBuild version:   17.11.41+18f1ecf82

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.26100
 OS Platform: Windows
 RID:         win-x64
 Base Path:   C:\Program Files\dotnet\sdk\8.0.414\

.NET workloads installed:
Configured to use loose manifests when installing new manifests.
There are no installed workloads to display.

Host:
  Version:      10.0.0-preview.7.25380.108
  Architecture: x64
  Commit:       30000d883e

.NET SDKs installed:
  8.0.414 [C:\Program Files\dotnet\sdk]
  9.0.304 [C:\Program Files\dotnet\sdk]
  10.0.100-preview.7.25380.108 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 8.0.19 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 8.0.20 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 9.0.8 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 10.0.0-preview.7.25380.108 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 8.0.19 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 8.0.20 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 9.0.8 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 10.0.0-preview.7.25380.108 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 8.0.19 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 8.0.20 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 9.0.8 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 10.0.0-preview.7.25380.108 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

Other architectures found:
  x86   [C:\Program Files (x86)\dotnet]
    registered at [HKLM\SOFTWARE\dotnet\Setup\InstalledVersions\x86\InstallLocation]

Environment variables:
  Not set

Anything else?

No response

[davidfowl]

@mitchdenny lets see if we can get #11367 in for 9.5

[DamianEdwards]

I've seen this error also shows up in VS for just a single AppHost in the solution. I think it's similar to the limitations around changing TFM multi-targeting, global.json, and nuget.config, in that VS caches a bunch of stuff on first project load and then if you change those things you need to re-open the solution or even restart VS to get them picked up 😕