Question

将以下内容转换为lambda表达式的方法是什么？

ThreadPool.QueueUserWorkItem(delegate
     {
        Console.WriteLine("Current Thread Id is {0}:",
         Thread.CurrentThread.ManagedThreadId);
        Console.WriteLine("I will be used as Callback");
      }
    );

Answer 1

你绝对可以把它写成lambda表达式：

// The underscore is simply a placeholder for the "state"
// parameter that the WaitCallback delegate expects - you could
// use any character but you must specify one as lamba expressions cannot
// omit parameters like anonymous functions can.
ThreadPool.QueueUserWorkItem((_) =>
    {
        Console.WriteLine("Current Thread Id is {0}:",
        Thread.CurrentThread.ManagedThreadId);
        Console.WriteLine("I will be used as Callback");
    });

但请记住，lambda表达式在源代码之外没有任何意义。 C＃编译器会将你的lambda表达式转换回你现在拥有的代码。

lambda表达式只是可用于表示匿名函数的语法糖 - 编译器会将其转换为匿名函数或表达式树。

C＃lambda表达式的转换

1 个答案: