What is C# written in?
C# is a multi-paradigm (object-oriented) programming language, first released in 2000.
Implementation
| Layer | Written in | Notes |
|---|---|---|
| Compiler | C# (since 2014) | C# Roslyn compiler written in C# (self-hosting) |
Self-hosting
C# is a self-hosting language: its compiler is written in C# itself. Self-hosting means the compiler can compile its own source code, which is a milestone in a language's maturity. New versions of the compiler are built using an older version of the same compiler, a process called bootstrapping.
Self-hosting also acts as a practical stress test: if a language can compile its own compiler, most core language features have been validated in a complex, real-world workload. See what is compiler bootstrapping for a full explanation.
Explore in the Graph
See C#'s full lineage, including all implementation and influence relationships, in the interactive graph.
Open Interactive Graph →Or view the C# language page for the complete record.