ARRAY INSERTION

Question

We have an array in which we have some elements we wish that user insert a value at a specified position in the array.... how is this done

Vulpes · Answer

Here's how you can insert an element on a "one off" basis into an array: using System; class Program { static void Main() { string[] sa = {"a", "b", "c", "e", "f"}; // suppose you want to insert "d" at index 3 int index = 3; string insertion = "d"; Array.Resize(ref sa, sa.Length + 1); // increase size by 1 // move elements from 'index' onwards 1 element to right for(int i = sa.Length - 1; i >= index + 1; i--) { sa[i] = sa[i - 1]; } // insert new element sa[index] = insertion; // check it worked foreach(string s in sa) Console.Write("{0} ", s); Console.ReadKey(); } } The output is: a b c d e f As the others have said, if you intend to do a lot of insertions, you're best using a List , LinkedList or ArrayList instead of an array.

Vulpes · Answer

This can also be done using LINQ: using System; using System.Linq; class Program { static void Main() { string[] sa = {"a", "b", "c", "e", "f"}; // suppose you want to insert "d" at index 3 int index = 3; string[] insertion = new string[]{"d"}; var temp = sa.Take(index).Concat(insertion); sa = temp.Concat(sa.Skip(index)).ToArray(); // check it worked foreach(string s in sa) Console.Write("{0} ", s); Console.ReadKey(); } }

Abhijit Patil · Answer

hey vipin , you can use arraylist Indices are zero based. So the first item is at index 0 and the tenth item at index 9 ArrayList.Insert int posNum ; if (! int . TryParse ( txtPosition . Text , out posNum )) { // show message return ; } else if ( posNum 0 || posNum > ActorArrayList . Count ) { // show message return ; } ActorArrayList . Insert ( posNum , actName ); } If you want to add the object at the end anyway, you just have to use Add : ActorArrayList . Add ( actName ); h ope it helps

Abhay Shanker · Answer

Please check below link http://stackoverflow.com/questions/9570944/adding-elements-to-a-c-sharp-array But why are you not using arraylist