如何使用LINQ C＃

Question

I have a ConcurrentDictionary<string, int> word = new ConcurrentDictionary<string, int>(); And i have List for files: static List<string> file = new List<string>(60);

Before, I used to use this path to write file information string line;

string[] lines;
        string[] linesUnos;
        string[] sp = { " " };
        int i = (int)obj;
        StreamReader reder = new StreamReader(file[i]);
        line = " ";
    while (!reder.EndOfStream)
    {
        line = reder.ReadLine().ToLower();
        lines = line.Split(sp, StringSplitOptions.RemoveEmptyEntries);

        foreach (var w in lines )
        {
            word.AddOrUpdate(w, 1, (key, oldValue) => oldValue + 1);
        }
    }

In this case the right to use a LINQ? I try this way,but it't not right:

IEnumerable<string> f, w;

line = reder.ReadLine().ToLower();

f = from lin in line.Split(sp, StringSplitOptions.RemoveEmptyEntries) select lin;

word = line.ToDictionary(s => s.Key, s => s.Count());

Answer 1

Let me try doing some reverse engineering . It seems, that you have several files (in the file list) organized like this:

 some words
 several new words
 nothing new

and you want some kind of a dictionary as a result

{"some", 1}     // 1: "some' appears just once
{"words", 2}    // 2: 'words' appears twice
{"several", 1}
{"new", 2} 
{"nothing", 1}
...

where Key is a word itself, and Value is its frequency. If it's your case and if you want to implement it with a help of Linq while using parallel processes , try using PLinq ; something like this:

  Dictionary<string, int> dict = file
    .AsParallel()                              // Doing in parallel
    .SelectMany(file => File.ReadLines(files)) // Read all lines of all files
    .SelectMany(line => line.Split(            // Split each line into words
       new char[] {' '}, 
       StringSplitOptions.RemoveEmptyEntries))
   // You may want to process words here, e.g. get rid of "stop words"
    .GroupBy(w => w) // Group by each word
    .ToDictionary(chunk => chunk.Key, chunk => chunk.Count()); 

Please, notice that you'll get just Dictionary , not ConcurrentDictionary .