NET-10: Set up .NET Core 6 project scaffolding

[devin-ai-integration]

Summary

Establishes the foundational .NET Core 6 project structure for the migration tracked in NET-10. The legacy ASP.NET MVC5 / EF6 projects at the repo root are left untouched; the new .NET Core 6 tree lives alongside them so subsequent phases (starting with HomeController migration) can move code over incrementally.

New top-level layout:

SampleWebApp.Core.sln
src/
  DataLayer/        net6.0 classlib (EF Core 6 + SqlServer provider + Tools)
  BizLayer/         net6.0 classlib (references DataLayer)
  ServiceLayer/     net6.0 classlib (references DataLayer)
  SampleWebApp/     ASP.NET Core MVC (net6.0), references all three layers
tests/
  Tests/            xUnit net6.0, references all src projects

Key pieces wired up:

• DataLayer/DataClasses/SampleWebAppDbContext.cs — empty EF Core DbContext (Blogs/Posts/Tags DbSets are deliberately deferred to later phases) with a ConnectionStringName = "SampleWebAppDb" constant that matches the legacy Web.config name.
• Per-layer DI extension methods (AddDataLayer, AddServiceLayer, AddBizLayer) registered in src/SampleWebApp/Program.cs. AddDataLayer calls UseSqlServer with the SampleWebAppDb connection string and throws if it's missing.
• appsettings.json + appsettings.Development.json / appsettings.Staging.json / appsettings.Production.json with environment-appropriate log levels. Dev/base include the (localdb)\mssqllocaldb connection string (matches the legacy default).
• MVC scaffolding (HomeController, Views, wwwroot with bootstrap/jquery, Program.cs) generated by dotnet new mvc — included so the solution builds and a Home page serves out-of-the-box.

dotnet build SampleWebApp.Core.sln succeeds locally with 0 warnings / 0 errors. dotnet test runs but reports "No test is available" (the xUnit project is intentionally empty — actual tests come with later phases).

Review & Testing Checklist for Human

• Confirm the src/ + tests/ folder layout alongside the legacy projects is the intended structure (vs. e.g. replacing the legacy tree or using a different naming scheme like .Core suffixes).
• Confirm the scope: SampleWebAppDbContext has no DbSets and AddServiceLayer / AddBizLayer are empty no-op registrations. This is intentional for foundation-only, but verify it matches the team's expectation for NET-10 vs. what belongs in later tickets.
• Connection string uses (localdb)\mssqllocaldb which only works on Windows. If devs run on Linux/macOS or CI, a different default (or user-secrets / env override) may be needed.
• The new xUnit test project contains zero tests — if CI asserts tests must exist or code coverage thresholds apply, this will need a placeholder test or CI config update.
• Run dotnet build SampleWebApp.Core.sln and dotnet run --project src/SampleWebApp on a Windows machine with LocalDB to confirm the app starts and the Home page serves.

Notes

• The legacy SampleWebApp.sln and all existing .csproj / packages.config files are unchanged.
• The new DataLayer.csproj deliberately does not define InternalsVisibleTo("Tests") like the legacy project did; that can be re-added when real entities start moving over.
• A large portion of the diff is static assets under src/SampleWebApp/wwwroot/lib/ (bootstrap, jquery, jquery-validation) generated by dotnet new mvc — not hand-written.

Link to Devin session: https://app.devin.ai/sessions/c31603dfc46e406fa99067729d9a7851

[devin-ai-integration]

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