Question

int[] numbers = { 5, 4, 1, 3, 9, 8, 6, 7, 2, 0 }; 
string[] strings = { "zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine" }; 

var textNums = 
    from n in numbers 
    select strings[n]; 

Console.WriteLine("Number strings:"); 
foreach (var s in textNums) 
{ 
    Console.WriteLine(s); 
}

如何使用Lambda Expression编写相同的代码....

Answer 1

numbers.ToList().ForEach(item => Console.WriteLine(strings[item]));

Answer 2

我假设你的意思只是“来自” - 陈述？：

var textNs = numbers.Select(i => strings[i]);

Answer 3

var result=numbers.Select(n=>strings[n]);

这是正确的，但结果属于IEnumerable< String >类型此处，n的左侧=>(lambda operator)表示传递给函数的参数，strings[n]的右侧=>表示函数体。

有关Linq＆amp ;;的更多信息lambda表达式参考：http://www.codeproject.com/Articles/33769/Basics-of-LINQ-Lamda-Expressions

Answer 4

var result = numbers.Select(n => strings[n]);

如何使用Lambda Expression编写相同的代码

4 个答案: