How can I compare each element of one string array to every element of another string array?

c# arrays string

11,383

Solution 1

foreach (string str in yourFirstArray)
{
   if (yourSearchedArray.Contains(str))
   {
      Console.WriteLine("Exists");
   }
}

Solution 2

foreach (string str in strArray)
{
   foreach (string str2 in strArray2)
   {
       if (str == str2)
       {
          Console.WriteLine("element exists");
       }
   }
}

Updated to display when string does not exist in strArray2

bool matchFound = false;
foreach (string str in strArray)
    {
       foreach (string str2 in strArray2)
       {
           if (str == str2)
           {
              matchFound = true;
              Console.WriteLine("a match has been found");
           }
       }

       if (matchFound == false)
       {
          Console.WriteLine("no match found");
       }
    }

Or another way of doing this in less lines of code:

foreach (string str in strArray)
{
    if(strArray2.Contains(str))
    {
       Console.WriteLine("a match has been found");
    }
    else
    {
       Console.WriteLine("no match found");
    }
}

11,383

Author by

born2fr4g

Updated on June 04, 2022

Comments

born2fr4g almost 2 years
I've got two string arrays. I want to select one element from the first array and compare to each element of the second array. If element from first array exist in elements of second array i whant to write for example ("Element exist") or something like this.

This should be possible to do with two for loops ?

EDIT

Ok i finaly achived what i wanted usign this code:
```
string[] ArrayA = { "dog", "cat", "test", "ultra", "czkaka", "laka","kate" };
string[] ArrayB = { "what", "car", "test", "laka","laska","kate" };

bool foundSwith = false;

for (int i = 0; i < ArrayA.Length; i++)
{

   for (int j = 0; j < ArrayB.Length; j++)
   {
       if (ArrayA[i].Equals(ArrayB[j]))
       {
           foundSwith = true;
           Console.WriteLine("arrayA element: " + ArrayA[i] + " was FOUND in arrayB");
       }
   }

   if (foundSwith == false)
   {
      Console.WriteLine("arrayA element: " + ArrayA[i] + " was NOT found in arrayB");
   }
   foundSwith = false;
}
```
I hope this will help others who will want to compare two arrays ;). its all about this foundSwitch. Thx for help once again.
- Sergey Kalinichenko almost 12 years
  
  "This should be possible to do with two for loops ?" Absolutely! Did you try writing these two loops? How did it go?
- Glenn Ferrie almost 12 years
  
  It probably takes longer to write this post than to write a script to test this. #lazy
- born2fr4g almost 12 years
  
  Sorry about not giving a code. I edited first post with my code.
- eyossi almost 12 years
  
  You can replace else if (s1 != s2) with only else... and it will work fine... what is the problem then?
- born2fr4g almost 12 years
  
  Could you check out my example in main question ? I just added to clarify what im trying to do. When im using else instead of else if i got the same wrong result (just like i write in example in main question)
Chris Taylor almost 12 years

This is a good solution, but you should not create the List<> it creates a new copy of the array which is unnecessary overhead. You could just use yourStringArray.Contains(str) directly.
born2fr4g almost 12 years

Im using .NET framework 2.0 and o got errors with this Even when i add using System.Linq.
born2fr4g almost 12 years

Its good but when i add to this if and else statmant for displaying this element not exist i receive weird result. Like its over iterating. How to add to this functionality - when element exists it writes element exists but when not element does not exists ?
eyossi almost 12 years

can you try using 'Array.Exists()` instead of Contains? (msdn.microsoft.com/en-us/library/yw84x8be(v=vs.80))
born2fr4g almost 12 years

i cannot unfortunately. Im trying to use code from belowe comment: foreach (string str in strArray) { foreach (string str2 in strArray2) { if (str == str2) { Console.WriteLine("element exists"); }else { Console.WriteLine ("element doesnt exists"); } } But i also need else statmant to write (this element does not exists). But when i write else stataments it overiterates i dont know why
eyossi almost 12 years

can you update your code with the new version and explain the problem again?
born2fr4g almost 12 years

I updated the code in above. Hope this will help you to help me ;)