Explore the latest preview features of C# 13

Collection Enhancements for Greater Flexibility

C# 13 introduces a feature where parameters can be of any of the types supported for collection expressions, providing greater flexibility when calling methods. This allows for passing the results of LINQ expressions as parameters, making method calls more versatile.

Object Index Operator Improvements

With C# 13, when the compiler recognizes that the target of the statement is an object, it now generates calls to the API and provides warnings for cases where an instance of a might be incorrectly treated as a normal object.

Escape Sequence Partial Properties

Similar to partial methods, C# 13 introduces partial properties that support source generators. This feature, like the regular expression source generator, creates efficient code for methods, enhancing the developer experience when working with source generators.

Method Group Natural Type Improvements

C# 13 refines the rules for determining the natural type of an expression to consider candidates by scope and prune candidates that have no chance of succeeding, enhancing the predictability and efficiency of method group natural types in the code.

Update on Extension Types

In C# 13, the Regex source generator has been updated, allowing developers to use properties in addition to methods. This update aims to provide a more natural feeling API design, enhancing the overall developer experience with extension types.

Try C# 13 Today

To explore these new features, you can try out C# 13 in the latest .NET 9 preview and Visual Studio 2022-17.11 preview. These enhancements focus on flexibility, performance, and improving everyday features in C# to make development easier and more efficient.

For more information on the latest features of C# 13, you can visit the Microsoft Docs.