How to check if list contains byte array?

Question

I have byte buffer:

byte[] buffer = new byte[3];
List<byte[]> list;

Now I am adding:

 while ((count = reader.Read(buffer, 0, buffer.Length)) != 0)
 {       
      bool contains = l.Contains<byte[]>(buffer); //This is not working and checking only reference 

      if (!contains)                          
      {                          
        l.Add(new byte[] buffer[0],buffer[1],buffer[2]});              
      }                
  }

How to check if list contains byte array wchich has the same values as buffer?

Please add a language tag to your question. (I am assuming C# but I am not sure) — Simon Forsberg
– Simon Forsberg, Commented Sep 25, 2013 at 11:22

Eren Ersönmez · Accepted Answer · 2013-09-25 11:21:26Z

8

Your current version is not working because it does a check based on reference equality.

You want to find out if any list elements contain the same sequence of bytes:

bool contains = list.Any(x => x.SequenceEqual(buffer));

answered Sep 25, 2013 at 11:21

Eren Ersönmez

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Amin AmiriDarban · Accepted Answer · 2013-09-25 11:33:22Z

0

public static bool ContainsSequence(byte[] toSearch, byte[] toFind) {
  for (var i = 0; i + toFind.Length < toSearch.Length; i++) {
    var allSame = true;
    for (var j = 0; j < toFind.Length; j++) {
      if (toSearch[i + j] != toFind[j]) {
        allSame = false;
        break;
      }
    }

    if (allSame) {
      return true;
    }
  }

  return false;
}

answered Sep 25, 2013 at 11:33

Amin AmiriDarban

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