C＃如何将不包含单个字符的字符串列表转换为char？

Question

I have list of strings which has such items inside - 65,66... so on.

When I'm trying to use Convert.ToChar(item) , I'm getting error that single string should have only one character. What I can't understood is what I can really use besides the Convert function to turn 65 (string) into char = A value.

static void Main(string[] args)
    {
        List<char> Alphabet = new List<char>();
        List<string> Message = new List<string>();
        for (int i = 65; i < 91; i++)
        {
            Alphabet.Add((char)i);
        }
        var stroke = Console.ReadLine().ToString();
        foreach (var letter in stroke)
        {
            if (Alphabet[Alphabet.Count - 1] == letter)
            {
                Message.Add((66.ToString()));
            }
            if (Alphabet[Alphabet.Count - 2] == letter)
            {
                Message.Add((65.ToString()));
            }
            if (Convert.ToChar(" ") == letter)
            {
                Message.Add(" ");
            }
            foreach (var item in Alphabet)
            {

                if (item == letter && letter != Alphabet[Alphabet.Count -1] && letter != Alphabet[Alphabet.Count - 2])
                {
                    Message.Add((item + 2).ToString());
                }
            }
        }
        foreach (var item in Message)
        {
            if (item != " ")
            {
                Console.Write(Convert.ToChar(Convert.ToInt16(item)));
            }
            else
            {
                Console.Write(" ");
            }
        }
        Console.ReadLine();}

Here is ending working code, for those who may wonder why i need such type of convert.Its Caesarus encrypter. Working only for upper-case letters but its working now with all help of those guys above.

Answer 1

If items of your list are int values such as 65,66, ... that seems to be character codes, you can try:

Convert.ToChar(Convert.ToInt32(item))

For example:

var str="65";
var chr= Convert.ToChar(Convert.ToInt32(str));
//The output is A

Answer 2

Encryption:

var stroke = Console.ReadLine();
var enc = new String(stroke.ToCharArray().Select(c=>Convert.ToChar(c+2)).ToArray());
Console.WriteLine(enc);