C# modifing a string array in a foreach loop and changing the same array

Question

Maybe I asked this is a bad way so let me try to explain.

I have a public static string[]

public static string[] MyInfo {get;set;}

I set this via

MyInfo = File.ReadAllLines(@"C:\myfile.txt");

What I want to do is a foreach on each of those lines and modify it based on x number of rules. One the line has been modified change that exisiting line in MyInFo

so

foreach(string myI in MyInfo)
{
string modifiedLine = formatLineHere(myI);
//return this to MyInfo somehow.
}

Answer 1

You can't do this in a foreach loop. Use for instead.

Answer 2

Use a for:

for(int i = 0; i < MyInfo.Length; i++)
{
 MyInfo[i] = formatLineHere(MyInfo[i]); 
}

Answer 3

var myInfoList = new List<string>();
foreach (var myI in MyInfo)
{
 var modifiedLine = formatLineHere(myI);
 myInfoList.Add(modifiedLine);
}
MyInfo = myInfoList.ToArray();

Update

You will need a reference to System.Linq in order to use the ToList() and ToArray() extension methods.

Answer 4

Or with Linq you could do:

MyInfo = MyInfo.Select(x => formatLineHere(x)).ToArray();