c# - 在 C# 中使用 Lambda 表达式是否有任何性能提升？

Question

我想知道通过执行以下操作在性能上是否有任何差异:

        void Example(string message)
        {
            System.Console.WriteLine(message);
        }

或

        void Example(string message)
        {
            ConsoleMessage(message);
        }

        void ConsoleMessage(string message) => System.Console.WriteLine(message);

Answer 1

您可以在 this website - SharpLab 上查看它是如何编译的.如你所见

  void ConsoleMessage(string message) => System.Console.WriteLine(message);

被编译为另一种方法。唯一的区别是使用 Example2 时多了一个方法调用。您可以在 this post - How expensive are method calls in .net 中阅读有关方法调用成本的更多信息

It's very, very unlikely to be your bottleneck though. As always, write the most readable code you can first, and then benchmark it to see whether it performs well enough. If it doesn't, use a profiler to find the hotspots which may be worth micro-optimising.