需要有关 Enumerable.Aggregate 函数的更多详细信息

你能帮我理解吗

       words.Aggregate((workingSentence, next) => + next + " " + workingSentence);   

从下面的代码片段？如果有人解释我如何在 C# 1.1 中实现这一点，那就太好了。

（摘自MS http://msdn.microsoft.com/en-us/library/bb548651.aspx)-

        string sentence = "the quick brown fox jumps over the lazy dog";
        // Split the string into individual words.
        string[] words = sentence.Split(' ');
        // Prepend each word to the beginning of the 
        // new sentence to reverse the word order.
        string reversed = words.Aggregate((workingSentence, next) =>
                                              next + " " + workingSentence);
        Console.WriteLine(reversed);
        // This code produces the following output:
        //
        // dog lazy the over jumps fox brown quick the

The Aggregate你的例子的一部分大致翻译成这样：

string workingSentence = null;
bool firstElement = true;
foreach (string next in words)
{
    if (firstElement)
    {
        workingSentence = next;
        firstElement = false;
    }
    else
    {
        workingSentence = next + " " + workingSentence;
    }
}
string reversed = workingSentence;

The workingSentence变量是一个累加器通过将函数应用于现有累加器值和序列的当前元素，在循环的每次迭代中更新；这是由示例中的 lambda 和 的主体执行的foreach在我的例子中循环。