How C-sharp converts some letters in one content into another

for example, there is an English article. I want to replace each of the 26 letters in the article with another letter.
for example:
English content: Try Firefox with the bookmarks, history and passwords from another browser.
here t change letters a , r change s ,. And so on, all the letters in the article replace another custom letter at once.

C-sharp
Mar.14,2021
There is an idea of

. Convert the string into an array of characters, and then define an alphabet dictionary. The key of the dictionary is the character char before replacement, and the value of the dictionary is the replaced character char . A simple implementation is written for you, and the running effect is shown in figure

.

sample code: 

static void Main(string[] args)
        {
            var str = "Try Firefox with the bookmarks, history and passwords from another browser.";
            var strArr = str.ToArray();
            var result = Converter(strArr);
            Console.WriteLine($":{str}");
            Console.WriteLine($":{string.Join("", result)}");
            Console.ReadKey();
        }

        public static char[] Converter(char[] originalCharArray)
        {
            var dict = new Dictionary<char, char> {
                { 'a','s'},
                { 'b','t'},
                {'c','u'},
                {'d','v'},
                {'e','w'},
                {'f','x'},
                {'g','y'},
                {'h','z'},
                {'i','a'},
                {'j','b'},
                {'k','c'},
                {'l','d'},
                {'m','e'},
                {'n','f'},
                {'o','g'},
                {'p','h'},
                {'q','i'},
                {'r','j'},
                {'s','k'},
                {'t','l'},
                {'u','m'},
                {'v','n'},
                {'w','o'},
                {'x','p'},
                {'y','q'},
                {'z','r'},
            };
            var result = new List<char>();
            for (int i = 0; i < originalCharArray.Length; iPP)
            {
                var c = originalCharArray[i];
                var isUpperCase = Char.IsUpper(c);
                if (Char.IsLetter(c))
                {
                    c = dict[Char.ToLower(c)];
                    if (isUpperCase)
                    {
                        c = Char.ToUpper(c);
                    }
                }
                result.Add(c);
            }
            return result.ToArray();
        }

regular + LINQ 

string str = "Try Firefox with the bookmarks, history and passwords from another browser.";
//            Tjq Fajwxgp oalz lzw tggcesjck, zaklgjq sfv hskkogjvk xjge sfglzwj tjgokwj.
var dict = new Dictionary<string, string> {
    {"a","s"},{"b","t"},{"c","u"},{"d","v"},{"e","w"},{"f","x"},{"g","y"},
    {"h","z"},{"i","a"},{"j","b"},{"k","c"},{"l","d"},{"m","e"},{"n","f"},
    {"o","g"},{"p","h"},{"q","i"},
    {"r","j"},{"s","k"},{"t","l"},{"y","q"},{"z","r"}
};
            
var regex  = new System.Text.RegularExpressions.Regex(String.Join("|", dict.Keys));
var result = regex.Replace(str, m => dict[m.Value]);

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