[WebToolsE2E][Aspire] In VSCode/CLI, update the TargetFramework of the Aspire project from net9.0 to net10.0. After running the project, the dashboard page is blank.

[v-reinawang]

INSTALL STEPS

1. Install SDK 10.0 [10.0.100-alpha.1.24571.14]
2. dotnet nuget add source "dotnet10"
3. Install Aspire 9.0 template
   • Run dotnet new install Aspire.ProjectTemplates::9.0.0

REPRO STEPS

1. Open CMD, run following command to create an Aspire Starter App project

dotnet new aspire-starter -o aspire1
cd aspire1/aspire1.AppHost

2. Manually update the TargetFramework of all projects from net9.0 to net10.0
3. Use dotnet run to run the project

NOTE: In Visual Studio, update the TargetFramework of the Aspire project from net9.0 to net10.0 and run the project. The dashboard can be displayed normally.

ACTUAL
Aspire dashboard page is blank.

EXPECTED
Aspire dashboard page can be displayed normally.

[JamesNK]

This is a high impact bug. Prioritize fixing for 9.1 so it works when people use Aspire with upcoming .NET 10 previews.

I think the work is going to be in the dashboard to figure out what is breaking so assigned to @adamint.

cc @leslierichardson95

[balachir]

@v-reinawang @v-elenafeng I realized that this issue was opened a while ago. I have a couple of questions about whether this issue still reproduces using the latest builds. Can you take a look on Wednesday?

• For SDK 10.0 P1 (latest build) + Aspire 9.0 templates (latest released build), does this issue still reproduce?
  • If yes, can you update the INSTALL STEPS and REPRO STEPS in this issue to match the latest version of SDK 10.0
• If you then install Aspire 9.1 templates (latest build) and repeat the scenario in this issue, does the issue reproduce with Aspire 9.1?

[adamint]

@v-reinawang @v-elenafeng I realized that this issue was opened a while ago. I have a couple of questions about whether this issue still reproduces using the latest builds. Can you take a look on Wednesday?

• For SDK 10.0 P1 (latest build) + Aspire 9.0 templates (latest released build), does this issue still reproduce?

  • If yes, can you update the INSTALL STEPS and REPRO STEPS in this issue to match the latest version of SDK 10.0

• If you then install Aspire 9.1 templates (latest build) and repeat the scenario in this issue, does the issue reproduce with Aspire 9.1?

This does repro using the latest builds. However, it might not be an aspire issue - instead an asp.net or blazor issue.

[lewing]

cc @maraf @MackinnonBuck

[lewing]

I wasn't able to reproduce this with 10.0.100-preview.2.25111.19 sdk

[lewing]

also working with 10.0.100-alpha.1.25077.2 sdk

[Rita003]

Verify that this issue is fixed after installing the latest SDK10.0.100-preview.1.25110.2 + Aspire 9.1.0.