ASP.NET Core 2 High Performance(Second Edition)
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Expression bodies

Expression bodies allow you to assign an expression to a method or getter property using the lambda arrow operator (=>), which you may be familiar with from fluent LINQ syntax. You no longer need to provide a full statement or method signature and body. This feature has also been improved in C# 7, so see the examples in the next section.

For example, a getter property can be implemented like so:

public static string Text => $"Today: {DateTime.Now:o}";

A method can be written in a similar way, such as the following example:

private byte[] GetBytes(string text) => Encoding.UTF8.GetBytes(text);