Unity integrates the .NET platform, which enables you to write performant C# code that runs on a wide range of target hardware configurations and platforms. The exact C# API surface available to your code and the level of support for specific APIs varies depending on the API compatibility level you select and the platforms and hardware configurations you build for. This section outlines the specific details and limitations of Unity’s .NET integration, including API surface, C# compiler version, and language features.
| Topic | Description |
|---|---|
| API compatibility levels for .NET | Choose between the different .NET API compatibility levels that Unity can compile your project code against. |
| Add class library references to .NET Framework | Reference parts of the .NET class library API that Unity doesn’t compile by default. |
| C# compiler and language version reference | Details and limitations of the C# compiler and C# language version Unity uses. |