Learn about any breaking changes in the C# compiler

To find breaking changes since the C# 10 release, see Breaking changes in Roslyn after .NET 6.0.100 through .NET 7.0.100.

The Roslyn team maintains a list of breaking changes in the C# and Visual Basic compilers. You can find information on those changes at these links on their GitHub repository:

• Breaking changes in Roslyn in C# 10.0/.NET 6
• Breaking changes in Roslyn after .NET 5
• Breaking changes in VS2019 version 16.8 introduced with .NET 5 and C# 9.0
• Breaking changes in VS2019 Update 1 and beyond compared to VS2019
• Breaking changes since VS2017 (C# 7)
• Breaking changes in Roslyn 3.0 (VS2019) from Roslyn 2.* (VS2017)
• Breaking changes in Roslyn 2.0 (VS2017) from Roslyn 1.* (VS2015) and native C# compiler (VS2013 and previous).
• Breaking changes in Roslyn 1.0 (VS2015) from the native C# compiler (VS2013 and previous).
• Unicode version change in C# 6