What .NET Framework Versions Are Compatible with C# 6.0 Features?

C# 6.0 and .NET Framework compatibility

It is generally believed that C# 6.0 requires .NET Framework 4.6, but this is not entirely accurate.

C# 6.0 features are compiled using the Roslyn compiler, allowing them to target older framework versions. However, limitations arise when these features rely on support from the framework itself.

For example, string interpolation in C# 6.0 works in older .NET versions because it converts to string.Format. However, use with IFormattable requires .NET 4.6, since System.FormattableString was introduced in that version.

As for the specific features you mention, namely null propagation and property initialization, they do not require support from the framework and therefore can be used in .NET 4.0.

However, it is important to note that while code compiled against .NET 4.0 using these features may succeed, runtime exceptions may occur if the code relies on types that are not available in that version of the framework.

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