Linq Orderby用于选择中的复杂表达

Question

guys! I've got the code like following:

String input_string = "Good bye world!";
from c in input_string.Split(new char[]{' '})                   
    select int.Parse(c);

and I would like to order resulting query by int.Parse(c) like

String input_string = "Good bye world!";
from c in input_string.Split(new char[]{' '})
    orderby int.Parse(c)                    
    select int.Parse(c);

but without calculating int.Parse(c); again in orderby statement.

Any ideas?

Answer 1

You can use let :

var input = "3 2 1";

var query = from c in input.Split(' ')
            let x = int.Parse(c)
            orderby x
            select x;

foreach (var item in query)
{
    Console.WriteLine(item);
}

Output:

1
2
3

Answer 2

string input_string = "111 222 333";
var result = input_string.Split(null)
    .Select(int.Parse)
    .OrderBy(arg => arg)
    .ToList();