C# lambda 表达式的转换

发布于 2024-08-12 12:07:32 字数 279 浏览 2 评论 0原文

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");
      }
    );

原文

What is the way to convert the following into lambda expression?

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

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放肆 2024-08-19 12:07:32

您绝对可以将其写为 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# 编译器会将您的 lambda 表达式直接转换回您现在的代码。

lambda 表达式只是语法糖，可用于表达匿名函数 - 编译器会将其转换为匿名函数或表达式树。

You could definitely write this as a lambda expression:

// 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");
    });

But remember that a lambda expression has no meaning outside of your source code. The C# compiler will convert your lambda expression right back to the code you have now.

A lambda expression is simply syntactic sugar that you can use to express an anonymous function - the compiler will convert this to either an anonymous function or an expression tree.

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