Wrap AddDatabaseDeveloperPageExceptionFilter() in IsDevelopment() guard

[Copilot]

AddDatabaseDeveloperPageExceptionFilter() is a development-only service that exposes sensitive database information. Three architecture doc code samples registered it unconditionally, meaning production apps following these examples would register a dev-only diagnostic service unnecessarily.

Fixes #23037

Changes

• blazor-for-web-forms-developers/project-structure.md
• blazor-for-web-forms-developers/security-authentication-authorization.md
• modern-web-apps-azure/develop-asp-net-core-mvc-apps.md

All three samples updated from:

builder.Services.AddDbContext<ApplicationDbContext>(...);
builder.Services.AddDatabaseDeveloperPageExceptionFilter();  // unconditional

to:

builder.Services.AddDbContext<ApplicationDbContext>(...);

if (builder.Environment.IsDevelopment())
{
    builder.Services.AddDatabaseDeveloperPageExceptionFilter();
}

This matches the existing pattern already used in these same files for app.UseMigrationsEndPoint().

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• learn.microsoft.com
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

---

Internal previews

📄 File	🔗 Preview link
docs/architecture/blazor-for-web-forms-developers/project-structure.md	docs/architecture/blazor-for-web-forms-developers/project-structure
docs/architecture/blazor-for-web-forms-developers/security-authentication-authorization.md	docs/architecture/blazor-for-web-forms-developers/security-authentication-authorization
docs/architecture/modern-web-apps-azure/develop-asp-net-core-mvc-apps.md	docs/architecture/modern-web-apps-azure/develop-asp-net-core-mvc-apps

[BillWagner]

This LGTM.

[Copilot]

Pull request overview

Updates architecture guide code samples to register AddDatabaseDeveloperPageExceptionFilter() only in development, preventing production apps from enabling a dev-only diagnostic service that can expose sensitive database details.

Changes:

• Wrapped AddDatabaseDeveloperPageExceptionFilter() in if (builder.Environment.IsDevelopment()) { ... } in three documentation code samples.
• Aligned the service-registration pattern with the existing app.UseMigrationsEndPoint() development-only guard shown in the same samples.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
docs/architecture/blazor-for-web-forms-developers/project-structure.md	Updates the Program.cs sample to conditionally add the database developer exception filter in development only.
docs/architecture/blazor-for-web-forms-developers/security-authentication-authorization.md	Updates the EF Core/Identity configuration snippet to guard the dev-only exception filter behind IsDevelopment().
docs/architecture/modern-web-apps-azure/develop-asp-net-core-mvc-apps.md	Updates the Identity configuration sample to register the database developer exception filter only for development environments.