Question

I have an array:

string myArray={"15","56","17-75","78","100-150","130"}

I want to filter myList by arrayElements.

I want equivalent to code below, but programmatically:

mylist.Where(i=>i.val==15 || i.val==56 || (i.val >= 17 && i.val<75) ||i.val==78 || (i.val >= 100 && i.val<150)|| i.val==130)

Answer 1

First convert the strings to something that is more efficient to compare things to:

int[][] spans =
  myArray.Select(
    s => s.Split('-').Select(v => Int32.Parse(v)).ToArray()
  ).ToArray();

Then you can compare the items in the list to the values:

list.Where(i => spans.Any(s => {
  if (s.Length == 1) {
    return i == s[0];
  } else {
    return i >= s[0] && i <= s[1];
  }
}));