C # Deletes a repeating element instance from an array

Example 1

The code is as follows

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String[] Stringarray = {"AAA", "BBB", "AAA", "CCC", "BBB", "DDD", "CCC", "AAA", "BBB", "ddd"}; List is used to store the different elements taken out of the array list<string> liststring = new list<string> (); foreach (String eachstring in Stringarray) { if (!liststring.contains (eachstring)) Liststring.add (eachstring); } Finally, take each string out of the list and manipulate it. foreach (String eachstring in liststring) { Console.Write (eachstring); Print each string }

Example 2

code is as follows

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//1. Converts a string to an array of String ls_str= "122,158,141,236,896,123,122,158,141"; String[] Str_num=ls_str. Split (', ');  //2. Define ArrayList to determine that the repeating field in the array is not added to the ArrayList object    ArrayList al = new ArrayList ();    for (int i = 0; i < Str_num. Length; i++)     { //To determine if an already exists      if (al. Contains (str_num[i]) = = False)         {             al. ADD (Str_num[i]);         }    }  //3. Convert ArrayList to array    str_num= new String[al. Count];    str_num= (string[]) al. ToArray (typeof (String));