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How can I can get the index of an array element? Is there a method available?

What I have tried:

Nothing.
Posted
Updated 6-Aug-21 7:56am
v2

There is the Array.IndexOf[^] method, but it may not return the one you want: it will return the first matching entry. So if you have two elements with the value "9", it will always return the one with the lowest index.
   
Comments
Espen Harlinn 14-Feb-11 4:55am
   
Nice and easy, a 5
Sergey Alexandrovich Kryukov 14-Feb-11 18:00pm
   
Correct, my 5.
--SA
Hi Mehdi,

Simply you make a loop for searching for that element in your array.

This is an example:

int[] Array = { 5, 8, 3, 7 };
int Element = 3;
int Index;

for (int i = 0; i < Array.Length; i++)
{
     if (Element == Array[i])
     {
         Index = i;
     }
}



I hope this help,
:)
   
Hope Array Index of[^] will guide you.
   
Answer 1 wil give u the first index of the element in array and answer 2 wil give u the last index

You can use List to keep record of all indexes of element to search


C#
List<int> index_list =new List<int>();
int srch=3;

for (int i = 0; i < Array.Length; i++)
{
     if (srch == Array[i])
     {
         index_list.Add(i);
     }
}

foreach (int index in index_list) // Loop through List with foreach
        {
            // do ur coding for index here
        }

</int></int>



if dont want to use List, then can use string too, see here


Unknown size Numeric Arrays from Strings - dontumindit[^]
   
v3
lets say:
public int GetIndexOfArray(string Element, string[] Array)
{
  for ( int i = 0; i < Array.Length; i++)
  {
      if( Element == Array[i])
      {
          return i;
      }
  }
return -1;
}

int x = GetIndexOfArray(Element, Array);
/*if x = -1 then there is no such Element, else it will return the index of the Element in the Array*/
   
v2
Comments
shadi_abushaar 14-Feb-11 5:46am
   
this is the Method that you required to get you the index of an element in an array, you just need to give this method the element and the array as an input and it will return the index of the element in the array otherwise it will return -1.. for not finding.. hope it will work with you man..

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