Does C# 6.0 Work with .NET 4.0?

Is C# 6.0 compatible with .NET 4.0?

There are discrepancies in the sources of information regarding C# 6.0 and .NET Framework version compatibility, so this issue needs to be clarified.

Compiler Compatibility and Framework Dependencies

C# 6.0 requires the new Roslyn compiler, which allows access to C# 6.0 features regardless of the target framework version. However, some C# 6.0 features require framework support.

Features that require no framework dependencies

The example provided in the question, showing null propagation and property initialization, falls into this category. These features work without additional framework support and are therefore compatible with older versions such as .NET 4.0.

Features that require framework support

On the other hand, some C# 6.0 features will not work without the corresponding framework version. For example, string interpolation using IFormattable requires .NET 4.6 because it relies on the newly introduced System.FormattableString type.

Conclusion

So while C# 6.0 can be used with .NET 4.0 for features that do not require framework support, it is important to evaluate individual features for compatibility before implementation. By avoiding dependencies on framework features, developers can take advantage of C# 6.0 enhancements in software targeting older .NET versions.

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