How to replace value in string array

Question

How to remove my value in String Array and how i can rearrange

public string[] selNames = new string[5];
selNames[0]="AA";
selNames[1]="BB";
selNames[2]="CC";
selNames[3]="DD";
selNames[4]="EE";

In certain Conditaion i need to Check for the existing value and i want to remove it from my collection, How i can do it.

i tried like below, but i cannot, it returns true, but how to make that index value to null

If(selNames .Contains("CC").ToString()==true)

{ // how to make that index null which contains the "CC"; and i need to rearrage the array }

• Nick Martyshchenko: Can you use another data structure instead of array, e.g. Dictionary<> bit.ly/9IhY4j or HashSet<> bit.ly/c4GMUu? It provides both features (quick search and removing) by default.
• Thorin Oakenshield: @ Nick Martyshchenko :(+1) i think Generic types are more flexible to handle.

Answer 1

You can do following.

var newArray = selNames.Where(s => s != "CC").ToArray();

where s is the arg of the Func<TSource, bool> delegate TSource is string in your case. So it will compare each string in array and return all which is not "СС"

here is a link to msdn

• user438034: Wouldn't this be enough? var newArray = selNames.Where(s => s != "CC").ToArray()
• Thorin Oakenshield: @deep : s represents the current item in the array. just like X in foreach(String X in selNames )

Answer 2

You can use the 'List< T>' for checking the existing values and also can remove the item from the list and also can arrange the list. The following is the code snippet:

 List<string> list = new List<string>();
 list.Add("AA");
 list.Add("BB");
 list.Add("CC");
 list.Add("DD");
 list.Add("EE");
 list.Add("FF");
 list.Add("GG");
 list.Add("HH");
 list.Add("II");
 MessageBox.Show(list.Count.ToString());
 list.Remove("CC");
 MessageBox.Show(list.Count.ToString());