[release/9.4] serve blazor.web.js from wwwroot

[JamesNK]

Customer Impact

At least 3 people have reported seeing this error when running the dashboard:

Unhandled exception. System.InvalidOperationException: Could not load the embedded file manifest 'Microsoft.Extensions.FileProvid │
│ ers.Embedded.Manifest.xml' for assembly 'Aspire.Dashboard'. │
│ at Microsoft.Extensions.FileProviders.Embedded.Manifest.ManifestParser.Parse(Assembly assembly, String name) │
│ at Microsoft.Extensions.FileProviders.ManifestEmbeddedFileProvider..ctor(Assembly assembly) │
│ at Aspire.Dashboard.DashboardEndpointsBuilder.MapDashboardBlazor(IEndpointRouteBuilder endpoints) in /source/aspire-9.4.0/src/ │
│ Aspire.Dashboard/DashboardEndpointsBuilder.cs:line 22 │
│ at Aspire.Dashboard.DashboardWebApplication..ctor(Action`1 preConfigureBuilder, WebApplicationOptions options) in /source/aspi │
│ re-9.4.0/src/Aspire.Dashboard/DashboardWebApplication.cs:line 447 │
│ at Program.

$(String[] args) in /source/aspire-9.4.0/src/Aspire.Dashboard/Program.cs:line 6

Unsure exactly what is causing the failure. Only some people are impacted. All reports are from MS folks?

We're fixing by switching to server the file from disk instead of using embedded file.

Testing

Manual. I launched the dashboard with the change to check the script file is available and the dashboard loads.

Risk

Low. Although it's critical that the dashboard loads this file, the delivery option (file on disk) is used for all other files. It's also easy to check whether it works or not.

Regression?

Yes. The dashboard worked consistently in 9.3, but in 9.4 there is this occasional error.

[Copilot]

Pull Request Overview

This PR transitions the Aspire Dashboard's blazor.web.js file from being served as an embedded resource to being served from the wwwroot directory as a static file. This change simplifies the file serving mechanism by removing custom endpoint mapping and embedded file provider infrastructure.

• Removes custom endpoint mapping for blazor.web.js that used embedded file providers
• Updates the script reference in App.razor to use the standard framework path
• Removes embedded resource configuration and related package dependencies

Reviewed Changes

Copilot reviewed 6 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/Aspire.Dashboard/DashboardWebApplication.cs	Removes call to MapDashboardBlazor() method
src/Aspire.Dashboard/DashboardEndpointsBuilder.cs	Removes entire MapDashboardBlazor() method and related imports
src/Aspire.Dashboard/Components/App.razor	Updates script src from custom path to standard framework path
src/Aspire.Dashboard/Aspire.Dashboard.csproj	Removes embedded resource configuration and file provider package reference
eng/Versions.props	Removes version property for embedded file provider package
Directory.Packages.props	Removes package version entry for embedded file provider