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.NET MAUI Theming · dotnet | DecimalAI

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.NET MAUI Theming

dotnet/maui-theming

Source dotnet/skills ↗License MIT

Guide for theming .NET MAUI apps — light/dark mode via AppThemeBinding, ResourceDictionary theme switching, DynamicResource bindings, system theme detection, and user theme preferences.

SkillScore100Maintained

Automatic

Frontend / UI pack

Last verified 8/9/2026

What it changes

Passed 23 of 23 test cases with the skill, and 19 of 23 without it.

Without skill83%

With skill100%

Checks it passed that the model alone missed

Recommend generic SetAppTheme for non-color properties like FontSize.
Recommend using implicit Styles with AppThemeBinding referencing StaticResource color keys.
State that standard MAUI ResourceDictionaries do not support Bootstrap-style class name theming.

and 1 more in the full report

4 fixed19 passed either way0 still failing0 broke

Pass-rate lift: +17 pp
Tokens: +153%
Agent turns: 0%
Response time: -24%

Model gemini-3.6-flashMeasured 8/9/2026v123 of 23 cases passed with skill

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/dotnet-maui-theming/SKILL.md https://app.decimal.ai/s/dotnet-maui-theming/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add dotnet-maui-theming, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/dotnet-maui-theming/ and pins it in .decimal/skills.lock

decimalai skills add dotnet-maui-theming

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/dotnet-maui-theming/SKILL.md https://app.decimal.ai/s/dotnet-maui-theming/SKILL.md

Raw file: /s/dotnet-maui-theming/SKILL.md ↗ · machine-readable summary at /s/dotnet-maui-theming.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 4 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 4

Prompt

I am building a view dynamically in C# for a .NET MAUI application and need to set light and dark theme values programmatically. I need to change a Label's TextColor and FontSize based on theme. What extension methods should I use on the Label control to assign these theme-dependent values?

What was checked, without and with the skill
Checked	Without skill	With skill
Recommend SetAppThemeColor for setting color properties like TextColor.	Passed	Passed
Recommend generic SetAppTheme for non-color properties like FontSize.	Missed	Passed

case-02 · gemini-3.6-flash · 8/9/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md397 lines2 files

.NET MAUI Theming

Apply light/dark mode support, custom branded themes, and runtime theme switching in .NET MAUI apps using AppThemeBinding, ResourceDictionary swapping, and system theme detection APIs.

When to Use

Adding light and dark mode support to a .NET MAUI app
Creating custom branded themes with ResourceDictionary
Detecting and responding to system theme changes at runtime
Letting users choose a preferred theme (light, dark, or system default)
Combining OS-driven theme response with custom color palettes

When Not to Use

Localization or language switching — see .NET MAUI localization docs
Accessibility-specific visual adjustments — see .NET MAUI accessibility docs
App icon or splash screen configuration — see .NET MAUI app icon docs
Bootstrap-style class theming — see the Plugin.Maui.BootstrapTheme NuGet package

Inputs

A .NET MAUI project targeting .NET 8 or later
XAML pages or C# UI code that need theme-aware styling

Workflow

Detect the current theme approach in the project (AppThemeBinding, ResourceDictionary, or none).
Choose the appropriate strategy: AppThemeBinding for simple light/dark, ResourceDictionary swap for custom/multiple themes, or both combined.
Define theme resources — inline AppThemeBinding values or separate ResourceDictionary files with matching keys.
Replace hardcoded colors with DynamicResource bindings (or AppThemeBinding markup) throughout XAML pages.
Add system theme detection via Application.Current.RequestedTheme and the RequestedThemeChanged event.
Implement user preference persistence with Preferences.Set / Preferences.Get and apply on startup.
Verify Android ConfigChanges.UiMode is set on MainActivity to avoid activity restarts on theme change.
Test both light and dark themes on at least one target platform, confirming all UI elements respond correctly.

Rules That Change the Answer

Check these rules against the user's scenario, and apply only the ones that affect what they asked. UiMode and dictionary swapping matter for runtime theme switching; they are noise in a question about setting up AppThemeBinding.

Track record

Benchmark

23 / 23

test cases passed, vs 19 / 23 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/3/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

dotnet / skills

plugins/dotnet-maui/skills/maui-theming/SKILL.md

View on GitHub ↗

License MITImported 8/3/2026Version v1Bundled 1 file

Other skills for the same job

Published skills whose descriptions closely match this one, with their headline benchmark lift.

managedcode/maui-themingGuide for theming .NET MAUI apps — light/dark mode via AppThemeBinding, ResourceDictionary theme switching, DynamicResource bindings, system theme detection, and user theme preferences. Use when: "dark mode", "light mode", "theming", "AppThemeBinding", "theme switching", "ResourceDictionary theme", "dynamic resources", "system theme detection", "color scheme", "app theme", "DynamicResource". Do not use for: localization or language switching (see .NET MAUI localization documentation), accessibilNear-identical description+5 pp pass-rate lift

More skills from the same source and nearby in the registry, with their headline benchmark lift.

Ready to supercharge your AI agents?

See it in action

What's inside

.NET MAUI Theming

When to Use

When Not to Use

Inputs

Workflow

Rules That Change the Answer

Track record

Benchmark

Adoption

SkillSafety

Source

Other skills for the same job

Related skills