C# 我正在尝试制作简单的加密机

我制作了简易加密机 我不仅需要加密一个字母，还需要加密之后如何解密单词

        string[] Alpha = new string[]
        {"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z" };
        string[][] Encryptor = new string[][]
        {
          new string[] {"4", "/=", "@", "/-"},
          new string[] {"8", "13", "|3", "&" },
          new string[] {"(", "¢", "<", "[", },
          new string[] {"[)", "|>", "|)", "|]"},
          new string[] {"3", "€", "[-", "[=" },
          new string[] {"|=", "ƒ", "/="},
          new string[] {"6", "(_+"},
          new string[] {"#", "/-/", "[-]", "]-[", ")-(", "(-)"},
          new string[] {"1", "!", "|", "][", ":"},
          new string[] {"_|", "_/"},
          new string[] {"|<", "|{"},
          new string[] {"1_", "|_", "[_"},
          new string[] {"|V|", "|V/|"},
          new string[] {"|V", "/v"},
          new string[] {"[]", "0", "()"},
          new string[] {"|*", "|0", "|o" },
          new string[] {"(_,)", "()_", "0_", "O_"},
          new string[] {"2", "|?", "|2"},
          new string[] {"5", "$", "_/~" },
          new string[] {"7", "¯|¯" },
          new string[] {"(_)", "!_!", "|_|"},
          new string[] {"|/", "!/"},
          new string[] {"`//", "\v/", "|_|_/"},
          new string[] {"><", "}{", ")("},
          new string[] {"`/", "!/"},
          new string[] {"≥", "7_", ">_"}
        };
        Random rand = new Random();
        string str = Console.ReadLine();
        int index = Array.IndexOf(Alpha, str);
        string rez = Encryptor[index][rand.Next(Encryptor[index].Length)];

---

问题是当您有多个字符时，因为alpha数组的每个值只有一个字符。所以你应该循环每个角色。我做了一个修改，下面是代码更改，它将遍历输入字符串的每个字符

Random rand = new Random();
string str = Console.ReadLine();
    
StringBuilder rez = new StringBuilder();
for (int i = 0; i < str.Length; i++)
{
    int index = Array.IndexOf(Alpha, str[i].ToString());
    string[] curEnc = Encryptor[index];
    int r = rand.Next(curEnc.Length-1);
    rez.Append(curEnc[r]);
}

//Console.WriteLine(rez.ToString());

Random rand=new Random（）；
string str=Console.ReadLine（）；
StringBuilder rez=新的StringBuilder（）；
对于（int i=0；i

Duplicate：您的索引很可能是-1。使用调试器检查-1的运行情况，以及如何修复不输入不在

Alpha

中的内容的问题？如果用户输入大写字母怎么办？还是数字？还是空白字符？或者其他内容？例如，如果您的输入是

“aa”

，则

索引将是
-1
，因为
Alpha
不包含
“aa”
。您可能需要类似于
string rez=string.Empty；foreach（str中的字符c）{int index=Array.IndexOf（Alpha，c.ToString（））；if（index>=0）{rez+=Encryptor[index][rand.Next（Encryptor[index].Length）]；}
。这根本不是优化的，但应该给你一个起点。
Random rand = new Random();
string str = Console.ReadLine();
    
StringBuilder rez = new StringBuilder();
for (int i = 0; i < str.Length; i++)
{
    int index = Array.IndexOf(Alpha, str[i].ToString());
    string[] curEnc = Encryptor[index];
    int r = rand.Next(curEnc.Length-1);
    rez.Append(curEnc[r]);
}

//Console.WriteLine(rez.ToString());