Question

Can you help me to understand,

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

from below code snippet? and it would be great if someone explain me to achive this in C# 1.1.

(Snippet From MS)-

        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

Answer 1

The Aggregate part of your example translates to something roughly like this:

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 variable is an accumulator that is updated on each iteration of the loop by applying a function to the existing accumulator value and the current element of the sequence; this is performed by the lambda in your example and by the body of the foreach loop in my example.