Learn and compile C# on the go using the Mono CLR under Android

*** Premium feature with a 14 day trial period (single one-time purchase or ad-supported after that)

Features:
- C# 8.0 support (classes, methods, LINQ, etc)
- Write and compile console code
- Write and compile Android GUI code
- Syntax highlighting
- Advanced code completion ***
- Show compiler errors
- NuGet package managment
- Reference additional assemblies
- Helper classes (MessageBox, Toast, OpenFileDialog, etc)
- Export to APK
- Export to assembly (.exe or .dll)
- Create launcher shortcut to assembly ***
- Settings for behaviour/features
- And more


Everything (including compilation and code analysis) is done on your device which requires a lot of RAM and CPU for optimal functionality and performance. Crashes and background issues are expected at the minimum requirments.
Minimum device requirments: 1GB RAM, 1 GHZ Quad-core CPU



Notes and FAQ:

This is not Visual Studio. This is Android, not Windows.
Anything leveraging native Windows APIs will not work. That includes all of Windows.Forms, WPF, UWP, and ASP.NET among numerious other libraries and frameworks intented only for desktop computers.
The Mono version for Android doesn't have most of System.Drawing as it was deemed redundant due to Android.Graphics.

Why does the app show a compilation error? Doesn't it support /C# feature here/?
The app uses the Roslyn compiler - full C# 8 compilation support.
Any compilation related error encountered is a syntax or logic error in your own code and thefore only adressable by you.

Does the app support GUI?
Yes, Xamarin.Forms.

Does the app support Windows.Forms?
No. Android OS != Windows. It is impossible for Android to support Windows.Forms due to extreme incompatibility issues (no touch, no direct mapping for some controls and incompatable layouts for starters)

Why can't I close file/project?
Redundant operation. They are closed automatically when you open or create a new one.

Do I need to change anything in the app's keyboard settings section?
Probably not. Defaults are highly recommended, as the warnings suggest.
Changing them shouldn't be necessary for 99% of devices and can result in serious input problems such as backspace not working properly.

Why was the application closed when when returning to foreground after a while?
It is a RAM intensive app. Another such application, such as a web browser, will cause the system to kill C# Shell to free resourcces.

Does the app support NuGet packages?
Yes, but not fully. Anything containing non-C# library dependencies won't work. Including Android bindings, at least for now.

Does the app support databases?
In general, yes. However a full ORM like Entity isn't properly supported.


Does the app support scripts?
No, that might be confusing for people who aren't yet familiar with the C# language.

Does the app support creating class files?
Yes, from the "+" in the left project menu. It doesn't support automatically making them in an already existing file, since that is the same as typing it somewhere.

Can I reference a ".dll" file?
Yes, from the "+" in the left project menu.

Does the app support external keyboards?
Yes. Including a few custom shortcuts.

How to fix "You need to declare the permission..." ?
You need to declare it from the "APK project settings" and then export as APK.

How to fix ""application was not installed"" ?
Will probably happen after changing signing certificate. Uninstall your app and recompile/install the apk.

Is the app free?
Yes and no. There is a 14 day period where it is completely free in any situation.
After that there are 2 options for some functionality:
1. A single time purchase for about 2 USD.
2. An ad-supported model that actively requires an internet connection, but doesn't require any payment