How to check if a value exists in an array (C#)

Question

I am making a level generation algorithm. I have all my objects stored in an array. These objects are determined by numbers. I need to check whether the number "0" exists or not. How do I do this? Thanks

Answer 1

Best Answer

Answer by Johnnemann · Apr 26, 2013 at 12:27 AM

If you're using an actual Array, you can use Array.Find() or Exists() to look for the matching member: http://msdn.microsoft.com/en-us/library/d9hy2xwa.aspx or http://msdn.microsoft.com/en-us/library/yw84x8be.aspx

However, if you use a List instead, you can use List.Contains(), which has a bit easier syntax. http://msdn.microsoft.com/en-us/library/bhkz42b3.aspx

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Answer 2

Answer by markwelbar · Jul 24, 2013 at 06:59 AM

you can check simple like the following :

C# Array full source code

         string stringToCheck = "GHI";
         string[] stringArray = { "ABC", "DEF", "GHI", "JKL" };
         foreach (string x in stringArray)
         {
             if (x.Equals (stringToCheck))
             {
                 MessageBox.Show("Find the string ..." + x);
             }
         }

Mark

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Answer 3

Answer by sharpcoders · Nov 06, 2013 at 10:36 AM

Its pretty simple, use this

 string[] stringArray = { "text1", "text2", "text3", "text4" };
 string value = "text3";
 int pos = Array.IndexOf(stringArray, value);
 if (pos > -1)
 {
     return true;
 }
 else
 {
     return false;
 }

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firemyst · Nov 10, 2014 at 12:32 AM 0

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The fastest way to search an array is doing a binary search:

Array.BinarySearch

This website benchmarks other methods as well, but the binary search always came out on top.

How to check if a value exists in an array (C#)

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