How to remove list element?

Question

I have two lists like below.

List<string> apple= new List<string>();
  apple.Add("a");
  apple.Add("b");

List<string> ball= new List<string>();
  ball.Add("a,b");
  ball.Add("b,c");
  ball.Add("c,a");

Now I want to remove elements from the ball list that of which there are substrings of those elements in the apple list. That is if "a" occurs in ball list element, I have to remove those listelements from the ball list.

My expected output of ball list should be (b,c).

Andrei Tătar · Accepted Answer · 2015-06-13 10:06:24Z

2

Here a quick LinqPad

var apple= new List<string>();
apple.Add("a");

var ball= new List<string>();
ball.Add("a,b");
ball.Add("b,c");
ball.Add("c,a");

ball.Where(b=>apple.Any(b.Contains))
    .ToList() //create a duplicate, also lists have ForEach
    .ForEach(b=>ball.Remove(b));

ball.Dump();

Output is:

b,c

answered Jun 13, 2015 at 10:06

Andrei Tătar

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Comments

Giorgi Nakeuri · Accepted Answer · 2015-06-13 10:19:10Z

1

You can try this:

ball = ball.Where(b => !apple.Any(a => b.Contains(a))).ToList();

edited Jun 13, 2015 at 10:19

answered Jun 13, 2015 at 10:05

Giorgi Nakeuri

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1 Comment

Andrei Tătar Over a year ago

This will cause a compile time error. "Where" returns an IEnumerable but ball is a list. ToList is needed after Where. Also the request was to remove items from the list, not replace the list.

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