C# Online Compiler — Free Cloud .NET IDE & C# Runner
C# Online Compiler & .NET Cloud IDE (Mono Runtime / C# 12)
ZenCompiler delivers a lightweight, high-performance online C# compiler powered by the Mono .NET runtime environment. Compile and execute C# code featuring Language Integrated Query (LINQ), object-oriented programming (classes, interfaces, records, inheritance), generic collections (List<T>, Dictionary<TKey, TValue>), switch statements, pattern matching, and async/await task workflows directly in your browser.
Core C# Compiler Features
- Rich LINQ query comprehension and method syntax (Where, Select, OrderBy, GroupBy)
- Generic collections, strongly-typed data structures (Dictionary<TKey, TValue>, List<T>), and nullable reference types
- Object-oriented class hierarchies, interfaces, abstract classes, and encapsulation
- C# switch statement expressions and modern pattern matching
- Interactive Console.ReadLine() STDIN terminal support for user input
- Zero-install .NET development on mobile devices, tablets, and desktop workstations
Linux Container Sandboxing & Toolchain
Compiled with mcs / Mono runtime on Linux container nodes with automatic reference to System, System.Core, System.Collections.Generic, and System.Linq.
Supported Use Cases
Practicing C# language fundamentals, experimenting with LINQ data transformations, testing OOP design patterns, enterprise .NET logic prototyping, and preparing for C# technical interviews.
Frequently Asked Questions
How do I run C# code online in ZenCompiler?
Simply type or paste your C# code into the editor, provide any optional inputs in the STDIN tab, and click the "Run" button (or press Ctrl/Cmd + Enter). Your code is executed inside a secure cloud Linux container with output streaming directly to the terminal.
Can I use ZenCompiler as an online c# compiler for mobile?
Yes! ZenCompiler is fully optimized as a mobile compiler online. You can code, edit, and run C# on any mobile smartphone, iPhone, Android device, or tablet with responsive touch controls, virtual keyboard shortcuts, and full terminal input support without downloading any apps.
Which C# compiler or runtime version is used?
ZenCompiler executes code using C# (Mono 6.6), ensuring modern language standards, optimizations, and standard library support.
Can I use LINQ queries and Generic Collections in this C# online compiler?
Yes. ZenCompiler automatically imports and links System.Linq and System.Collections.Generic, allowing you to write complex LINQ filter, map, and aggregation chains effortlessly.
How do I use Dictionary and List collections in C#?
Initialize typed collections like var dict = new Dictionary<string, int>(); or var list = new List<string>(); with standard indexing and lookup methods.
How do I handle interactive console input with Console.ReadLine()?
Enter your input data in the STDIN tab before clicking Run, or interact directly inside the embedded terminal pane during execution.
