Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add managedcode/dotnet-skills --skill maui-dependency-injectiongit clone --depth 1 https://github.com/managedcode/dotnet-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/managedcode/dotnet-skills/maui-dependency-injection)<a href="https://agentmods.dev/skills/managedcode/dotnet-skills/maui-dependency-injection"><img src="https://agentmods.dev/badge/skills/managedcode/dotnet-skills/maui-dependency-injection/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/managedcode/dotnet-skills/maui-dependency-injection"><img src="https://agentmods.dev/badge/skills/managedcode/dotnet-skills/maui-dependency-injection.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00144 | $0.03080 |
| Opus 5.5 | $0.00058 | $0.01232 |
| Sonnet 5.5 | $0.00029 | $0.00616 |
| Haiku 4.5 | $0.00014 | $0.00308 |
Grade A, and why
maui-dependency-injection scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
This is a copy
100% identical to maui-dependency-injection — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 350 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Dependency Injection in .NET MAUI
.NET MAUI uses the same Microsoft.Extensions.DependencyInjection container as ASP.NET Core. All service registration happens in MauiProgram.CreateMauiApp() on builder.Services. The container is built once at startup and is immutable thereafter.
When to Use
- Registering services, ViewModels, and Pages in
MauiProgram.cs - Choosing between
AddSingleton,AddTransient, andAddScoped - Wiring constructor injection for Pages and ViewModels
- Leveraging Shell navigation to auto-resolve DI-registered Pages
- Registering platform-specific service implementations with
#ifdirectives - Designing interfaces for testable service layers
When Not to Use
- XAML data-binding syntax or compiled bindings — use the maui-data-binding skill
- Shell route registration and query parameters — use the maui-shell-navigation skill
- Mocking frameworks or test runners — use standard .NET testing tools (xUnit, NUnit, MSTest) and mocking libraries (NSubstitute, Moq)
Inputs
- A .NET MAUI project with a
MauiProgram.csfile - Knowledge of which services, ViewModels, and Pages need registration
- Target platforms (Android, iOS, Mac Catalyst, Windows) for conditional registrations
Rules That Change the Answer
| Situation | Do this | Why |
|---|---|---|
| Registering a Page or ViewModel | Prefer AddTransient |
A fresh instance per navigation avoids stale state, and a Singleton page cannot be re-added to the visual tree after it is removed. Singleton is defensible for a genuinely single-instance page (e.g. a root tab you want to keep warm) |
| Registering shared/expensive state | AddSingleton |
One instance app-wide (settings, DB connection, HttpClient handler) |
Tempted to use AddScoped |
Use AddTransient (or AddSingleton if sharing is intended) |
MAUI has no built-in request scope like ASP.NET Core's HTTP pipeline. MAUI does create one IServiceScope per window, so a Scoped service lives as long as that window — and resolved from the root provider it behaves like a Singleton. Neither gives you per-navigation freshness |
| Navigating to a DI-registered page | Register the page and its ViewModel, then Routing.RegisterRoute |
Shell.Current.GoToAsync resolves the page through DI and injects its constructor dependencies |
| Platform-specific implementation | #if per platform with every platform covered |
A missing platform branch leaves the service unregistered and throws at resolution time |
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2mo ago First seen · 350 lines · 144 tokens per session scan A 0efbf7b9dd6c
maui-dependency-injection is a skill published in the GitHub repository managedcode/dotnet-skills (496 stars, last pushed yesterday), licensed MIT. It adds 144 tokens to every session and 3,080 once invoked, about $0.0006 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 100% identical to maui-dependency-injection, differing in 0 lines, and is treated as a copy.
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