remove duplicates from two string arrays c#

Question

How can i effectively remove duplicates from two string arrays? I want to remove all the duplicates from a string[] a that are in a separate string[] b

for example

a = { "1", "2", "3", "4"};
b = { "3", "4", "5", "6"};

the result i am looking for would just be

c = { "5", "6"};

What happened with "2" and "1"? There are appear once... Should they be in the result? — nemesv, Nov 25 '12 at 18:20
@poplitea that duplicate question is different, it only gives the duplicates in 1 array not two different arrays — pyCthon, Nov 25 '12 at 18:30
+1 I think this is an interesting question and cannot understand why you got so much downvotes — MUG4N, Nov 25 '12 at 19:18
There might be a conspiracy to get the reversal gold badge... lol — pyCthon, Nov 28 '12 at 17:13

L.B · Answer 1 · 2012-11-25T18:53:22.570

14

var final = b.Except(a).ToList();

enter image description here

edited Nov 25 '12 at 18:53

answered Nov 25 '12 at 18:22

L.B

114,136
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score 7 · Accepted Answer · answered Nov 25 '12 at 18:22

7

Enumerable.Except produces set difference of two sequences

var c = b.Except(a).ToArray(); // gives you { "5", "6" }

answered Nov 25 '12 at 18:22

Sergey Berezovskiy

232,247
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score 2 · Answer 3 · answered Nov 25 '12 at 18:20

YOu can try using this:-

 List<string[]> moves = new List<string[]>();
 string[] newmove = { piece, axis.ToString(), direction.ToString() };
 moves.Add(newmove);
 moves.Add(newmove);

 moves = moves.Distinct().ToList();

or try this:-

 var c = b.Except(a).ToArray();

Mustafa Ekici · Answer 4 · 2016-10-27T21:40:32.883

        static void Main(string[] args)
        {        
             Foo(m.Length-1);
        }
        static string m = "1234"; 
        static string c = "3456"; 
        static int ctr = 0;
        static void Foo(int arg)
        {
            if (arg >= 0)
            {
                Foo(arg - 1);
                Console.Write(m[arg].ToString());
                for (int i = ctr; i <  m.Length; i++)
                {
                    if (c[i].ToString() == m[arg].ToString())
                    {
                        ctr++;
                        break;
                    }
                }  
                if(arg==m.Length-1)
                {
                    for (int i = ctr; i <m.Length; i++)
                    {
                        Console.Write(c[i].ToString());
                    }
                }
            }
         }

remove duplicates from two string arrays c#

4 Answers4

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