[release/9.0] Add .slnx fallback for TestHost content root discovery by Copilot · Pull Request #64953 · dotnet/aspnetcore

Copilot · 2026-01-06T23:27:39Z

Add .slnx fallback for TestHost content root discovery

Description

This pull request adds .slnx fallback support to the test-only UseSolutionRelativeContentRoot method in the Microsoft.AspNetCore.TestHost. When searching for solution files with the *.sln pattern, the method now falls back to searching for .slnx files if no .sln file is found, preventing the InvalidOperationException that would previously occur before test developers can easily call UseSolutionRelativeContentRoot themselves.

This has already been fixed in .NET 10 by #61305, but that included public API changes, so this is not a direct backport. Unlike, the .NET 10 change that treats .slnx and .sln equivalently by default, this change will only fall back to looking for an *.slnx file if the test server would otherwise throw an InvalidOperationException due to not being able to find an ".sln" file.

Fixes #61304 in .NET 9.

Customer Impact

#61304 has gotten a lot of attention, because it is a pain point for migrating solution from .sln to .slnx.

System.InvalidOperationException : Solution root could not be located using application root C:\Project\Path\bin\Debug\net9.0\

Stack Trace:
 at Microsoft.AspNetCore.TestHost.WebHostBuilderExtensions.UseSolutionRelativeContentRoot(IWebHostBuilder builder, String solutionRelativePath, String applicationBasePath, String solutionName)
 at Microsoft.AspNetCore.TestHost.WebHostBuilderExtensions.UseSolutionRelativeContentRoot(IWebHostBuilder builder, String solutionRelativePath, String solutionName)
 at Microsoft.AspNetCore.Mvc.Testing.WebApplicationFactory`1.SetContentRoot(IWebHostBuilder builder)
 at Microsoft.AspNetCore.Mvc.Testing.WebApplicationFactory`1.<ConfigureHostBuilder>b__22_0(IWebHostBuilder webHostBuilder)
 at Microsoft.Extensions.Hosting.GenericHostWebHostBuilderExtensions.ConfigureWebHost(IHostBuilder builder, Func`3 createWebHostBuilder, Action`1 configure, Action`1 configureWebHostBuilder)
 at Microsoft.AspNetCore.Mvc.Testing.WebApplicationFactory`1.ConfigureHostBuilder(IHostBuilder hostBuilder)
 at Microsoft.AspNetCore.Mvc.Testing.WebApplicationFactory`1.EnsureServer()
 at Microsoft.AspNetCore.Mvc.Testing.WebApplicationFactory`1.CreateDefaultClient(DelegatingHandler[] handlers)
 at Microsoft.AspNetCore.Mvc.Testing.WebApplicationFactory`1.CreateDefaultClient(Uri baseAddress, DelegatingHandler[] handlers)
 at Microsoft.AspNetCore.Mvc.Testing.WebApplicationFactory`1.CreateClient(WebApplicationFactoryClientOptions options)
 at Microsoft.AspNetCore.Mvc.Testing.WebApplicationFactory`1.CreateClient()

Test projects that worked fine with an .sln-based solution throw after migrating to *.slnx before developers even get access to the IWebHostBuilder, so they don't get the opportunity to easily manually reconfigure the content root by calling UseSolutionRelativeContentRoot with "*.slnx". Instead, the current general workaround is fragile and unintuitive:

public static class MvcTestingAppManifestHelper
{
    private const string ManifestFileName = "MvcTestingAppManifest.json";
    private static readonly JsonSerializerOptions JsonSerializerOptions = new() { WriteIndented = true };

    public static void AddAssemblyToManifest(Assembly assembly)
    {
        if (!File.Exists(ManifestFileName))
        {
            return;
        }

        // The manifest file is a dictionary of Assembly.FullName to ContentRoot.
        var manifest = JsonSerializer.Deserialize<Dictionary<string, string>>(File.ReadAllText(ManifestFileName))!;

        // Internally, the tilde is used to translate the content root to the AppContext.BaseDirectory.
        if (manifest.TryAdd(assembly.FullName!, "~"))
        {
            File.WriteAllText(ManifestFileName, JsonSerializer.Serialize(manifest, JsonSerializerOptions));
        }
    }
}

#61304 (comment)

Regression?

Yes
No

Not technically, but you could consider it a regression in behavior when migrating from .sln to .slnx solutions.

Risk

High
Medium
Low

This change only has an impact if starting the test server would otherwise throw an InvalidOperationException early during initialization due to not being able to find an ".sln" file.

Verification

Manual (required)
Automated

Packaging changes reviewed?

Yes
No
N/A

Add non-breaking .slnx fallback for content root lookup.

Description

Problem: UseSolutionRelativeContentRoot threw when only a .slnx existed, and .slnx could shadow .sln in parents.
Changes:

Keep .sln precedence; if none found, retry search for .slnx without changing API.
Added focused tests validating .sln preference and .slnx fallback discovery.

Example:

new WebHostBuilder()
    .UseSolutionRelativeContentRoot("src/MyApp", appBasePath, "*.sln"); // now falls back to slnx if no sln

Original prompt

Create a variant of #61305 that contains no breaking API changes. It should also avoid the behavioral breaking change when you could technically have a .slnx file that then "shadows" a .sln file in a parent folder. The only behavioral change is that it should not throw the InvalidOperationException from https://github.com/dotnet/aspnetcore/blob/release/9.0/src/Hosting/TestHost/src/WebHostBuilderExtensions.cs#L166 if there was an "*.slnx" file.

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.

Co-authored-by: halter73 <[email protected]>

Copilot

Pull request overview

This pull request adds non-breaking .slnx fallback support to the UseSolutionRelativeContentRoot method in TestHost. When searching for solution files with the "*.sln" pattern, the method now falls back to searching for .slnx files if no .sln file is found, preventing the InvalidOperationException that would previously occur.

Key changes:

Added .slnx fallback logic that only activates when no .sln file is found and the search pattern is "*.sln"
Maintained .sln precedence to avoid breaking changes where .slnx files could shadow .sln files in parent directories
Added comprehensive tests validating both the fallback behavior and .sln precedence

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/Hosting/TestHost/src/WebHostBuilderExtensions.cs	Added conditional .slnx fallback logic after .sln search fails, maintaining backward compatibility
src/Hosting/TestHost/test/WebHostBuilderExtensionsTests.cs	New test file with two tests: one verifying .slnx fallback and one verifying .sln takes precedence over .slnx

src/Hosting/TestHost/src/WebHostBuilderExtensions.cs

halter73 · 2026-01-09T23:47:15Z

/backport to release/8.0

github-actions · 2026-01-09T23:47:22Z

Started backporting to release/8.0 (link to workflow run)

Updated [Microsoft.AspNetCore.Mvc.Testing](https://github.com/dotnet/aspnetcore) from 9.0.12 to 9.0.13. <details> <summary>Release notes</summary> _Sourced from [Microsoft.AspNetCore.Mvc.Testing's releases](https://github.com/dotnet/aspnetcore/releases)._ ## 9.0.13 [Release](https://github.com/dotnet/core/releases/tag/v9.0.13) ## What's Changed * Update branding to 9.0.13 by @vseanreesermsft in dotnet/aspnetcore#64938 * [release/9.0] (deps): Bump src/submodules/googletest from `1b96fa1` to `9156d4c` by @dependabot[bot] in dotnet/aspnetcore#64908 * [release/9.0] Pass container image correctly for source-build job in official build by @akoeplinger in dotnet/aspnetcore#64781 * [release/9.0] Update dependencies from dotnet/extensions by @dotnet-maestro[bot] in dotnet/aspnetcore#64686 * [release/9.0] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/aspnetcore#64685 * [release/9.0] Update gradle by @github-actions[bot] in dotnet/aspnetcore#64980 * Backport #64657: Use shallow clones for CI jobs by @Copilot in dotnet/aspnetcore#64677 * [release/9.0] Update dependencies from dotnet/extensions by @dotnet-maestro[bot] in dotnet/aspnetcore#65012 * [release/9.0] Add .slnx fallback for TestHost content root discovery by @Copilot in dotnet/aspnetcore#64953 * Merging internal commits for release/9.0 by @vseanreesermsft in dotnet/aspnetcore#65046 **Full Changelog**: dotnet/aspnetcore@v9.0.12...v9.0.13) Commits viewable in [compare view](dotnet/aspnetcore@v9.0.12...v9.0.13). </details> Updated [Microsoft.AspNetCore.OpenApi](https://github.com/dotnet/aspnetcore) from 9.0.12 to 9.0.13. <details> <summary>Release notes</summary> _Sourced from [Microsoft.AspNetCore.OpenApi's releases](https://github.com/dotnet/aspnetcore/releases)._ ## 9.0.13 [Release](https://github.com/dotnet/core/releases/tag/v9.0.13) ## What's Changed * Update branding to 9.0.13 by @vseanreesermsft in dotnet/aspnetcore#64938 * [release/9.0] (deps): Bump src/submodules/googletest from `1b96fa1` to `9156d4c` by @dependabot[bot] in dotnet/aspnetcore#64908 * [release/9.0] Pass container image correctly for source-build job in official build by @akoeplinger in dotnet/aspnetcore#64781 * [release/9.0] Update dependencies from dotnet/extensions by @dotnet-maestro[bot] in dotnet/aspnetcore#64686 * [release/9.0] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/aspnetcore#64685 * [release/9.0] Update gradle by @github-actions[bot] in dotnet/aspnetcore#64980 * Backport #64657: Use shallow clones for CI jobs by @Copilot in dotnet/aspnetcore#64677 * [release/9.0] Update dependencies from dotnet/extensions by @dotnet-maestro[bot] in dotnet/aspnetcore#65012 * [release/9.0] Add .slnx fallback for TestHost content root discovery by @Copilot in dotnet/aspnetcore#64953 * Merging internal commits for release/9.0 by @vseanreesermsft in dotnet/aspnetcore#65046 **Full Changelog**: dotnet/aspnetcore@v9.0.12...v9.0.13) Commits viewable in [compare view](dotnet/aspnetcore@v9.0.12...v9.0.13). </details> Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. 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Updated [Microsoft.AspNetCore.OpenApi](https://github.com/dotnet/aspnetcore) from 9.0.9 to 9.0.13. <details> <summary>Release notes</summary> _Sourced from [Microsoft.AspNetCore.OpenApi's releases](https://github.com/dotnet/aspnetcore/releases)._ ## 9.0.13 [Release](https://github.com/dotnet/core/releases/tag/v9.0.13) ## What's Changed * Update branding to 9.0.13 by @vseanreesermsft in dotnet/aspnetcore#64938 * [release/9.0] (deps): Bump src/submodules/googletest from `1b96fa1` to `9156d4c` by @dependabot[bot] in dotnet/aspnetcore#64908 * [release/9.0] Pass container image correctly for source-build job in official build by @akoeplinger in dotnet/aspnetcore#64781 * [release/9.0] Update dependencies from dotnet/extensions by @dotnet-maestro[bot] in dotnet/aspnetcore#64686 * [release/9.0] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/aspnetcore#64685 * [release/9.0] Update gradle by @github-actions[bot] in dotnet/aspnetcore#64980 * Backport #64657: Use shallow clones for CI jobs by @Copilot in dotnet/aspnetcore#64677 * [release/9.0] Update dependencies from dotnet/extensions by @dotnet-maestro[bot] in dotnet/aspnetcore#65012 * [release/9.0] Add .slnx fallback for TestHost content root discovery by @Copilot in dotnet/aspnetcore#64953 * Merging internal commits for release/9.0 by @vseanreesermsft in dotnet/aspnetcore#65046 **Full Changelog**: dotnet/aspnetcore@v9.0.12...v9.0.13) ## 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9.0.11 [Release](https://github.com/dotnet/core/releases/tag/v9.0.11) ## What's Changed * Update branding to 9.0.11 by @vseanreesermsft in dotnet/aspnetcore#63950 * [release/9.0] Update dependencies from dotnet/extensions by @dotnet-maestro[bot] in dotnet/aspnetcore#63677 * [release/9.0] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/aspnetcore#63678 * [release/9.0] (deps): Bump src/submodules/googletest from `eb2d85e` to `9706f75` by @dependabot[bot] in dotnet/aspnetcore#63894 * [release/9.0] Fixed devtools url used for debug with chrome and edge by @github-actions[bot] in dotnet/aspnetcore#61948 * [release/9.0] (http2): Lower WINDOWS_UPDATE received on (half)closed stream to stream abortion by @DeagleGross in dotnet/aspnetcore#63934 * [release/9.0] Re-quarantine ServerRoutingTest.NavigationLock_OverlappingNavigationsCancelExistingNavigations_HistoryNavigation by @github-actions[bot] in dotnet/aspnetcore#63956 * [release/9.0] Fix nginx install on mac, linux by @wtgodbe in dotnet/aspnetcore#63966 * [Hot Reload] Do not attempt to apply empty deltas. by @tmat in dotnet/aspnetcore#63979 * Merging internal commits for release/9.0 by @vseanreesermsft in dotnet/aspnetcore#64036 * Revert log level severity for unknown proxy in ForwardedHeadersMiddleware by @BrennanConroy in dotnet/aspnetcore#64091 * Set timeoutInMinutes to 0 for Windows build job by @vseanreesermsft in dotnet/aspnetcore#64126 **Full Changelog**: dotnet/aspnetcore@v9.0.10...v9.0.11 ## 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Initial plan

de16383

Copilot AI assigned Copilot and halter73 Jan 6, 2026

dotnet-policy-service bot added this to the 9.0.x milestone Jan 6, 2026

Copilot started work on behalf of halter73 January 6, 2026 23:28 View session

Handle slnx fallback for content root resolution

737448c

Co-authored-by: halter73 <[email protected]>

Copilot AI changed the title ~~[WIP] Update WebHostBuilderExtensions to avoid exception with .slnx file~~ Add .slnx fallback for TestHost content root discovery Jan 6, 2026

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[release/8.0] Add .slnx fallback for TestHost content root discovery #65000

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halter73 changed the title ~~Add .slnx fallback for TestHost content root discovery~~ [release/9.0] Add .slnx fallback for TestHost content root discovery Jan 10, 2026

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wtgodbe merged commit 0e42d40 into release/9.0 Jan 13, 2026
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bkoelman mentioned this pull request Jan 31, 2026

Switch to .slnx file format json-api-dotnet/JsonApiDotNetCore#1912

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Bump Microsoft.AspNetCore.Authentication.OpenIdConnect from 9.0.12 to 9.0.13 frasermolyneux/portal-web#94

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[release/9.0] Add .slnx fallback for TestHost content root discovery#64953

[release/9.0] Add .slnx fallback for TestHost content root discovery#64953
wtgodbe merged 2 commits intorelease/9.0from
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