In C# 10, const strings may be initialized using string interpolation if all the placeholders are themselves constant strings. They make it easier to use lambda expressions without declaring a variable of a delegate type, and they work more seamlessly with the new ASP.NET Core Minimal APIs. These features make lambda expressions more similar to methods and local functions. Attributes can be applied to lambda expressions.Lambda expressions may declare a return type when the compiler can't infer it.Lambda expressions may have a natural type, where the compiler can infer a delegate type from the lambda expression or method group.Lambda expression improvementsĬ# 10 includes many improvements to how lambda expressions are handled: For more information about a property pattern, see the Property pattern section of the Patterns article. For example, a pattern of the form įor more information, see the Extended property patterns feature proposal note. Extended property patternsīeginning with C# 10, you can reference nested properties or fields within a property pattern. This new syntax saves both horizontal and vertical space for namespace declarations. You can use a new form of the namespace declaration to declare that all declarations that follow are members of the declared namespace: namespace MyNamespace This is typically all source files in a project. You can add the global modifier to any using directive to instruct the compiler that the directive applies to all source files in the compilation. You can build one by following this tutorial. NET libraries use this feature in many APIs. You can create a type that builds the resulting string from an interpolated string expression. A left-hand operand of the with expression can be of any structure type or an anonymous (reference) type.For more information, see the Struct initialization and default values section of the Structure types article.
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