C# 11, part of the upcoming .NET 7 release, brings several exciting new features aimed at improving both developer productivity and runtime performance. This version focuses on enhancing the language with raw string literals and checked user-defined operators, alongside optimizations for better performance, particularly for ASP.NET applications. C# 11 is expected to significantly reduce the complexity of string handling and provide developers with more control over custom operators, while also improving the overall efficiency of applications with minimal effort required on their part.
One of the standout features of C# 11 is the introduction of raw string literals, which are denoted by triple double quotes ("""). This new syntax simplifies working with strings that contain special characters or escape sequences, eliminating the need to manually escape characters. For example, when using raw string literals, characters like \t are treated as literal characters (\ and t), rather than being interpreted as a tab character. This feature will be especially useful for scenarios involving regular expressions, JSON, or other strings that commonly contain backslashes or quotes, making code cleaner and more readable.
Another important addition in C# 11 is the introduction of checked user-defined operators. This feature allows developers to define custom operators and mark them as “checked” using the checked modifier. This ensures that the operators will throw an exception on arithmetic overflow, which is crucial for certain types where overflow is a valid concern. By explicitly marking operators as checked, developers gain more control over how their custom types handle overflow scenarios, improving the robustness of their code.
However, not all planned features made it to C# 11. One feature that was removed prior to the release is parameter null checking. Originally, C# 11 was expected to introduce a feature that would allow the use of !! at the end of a parameter name to enforce null checking before a method executed. However, after further review, Microsoft decided to delay this feature, citing concerns over its design and its fit within the language. As a result, parameter null checking will not be part of the C# 11 release, but developers can expect future updates to address these concerns.