C#用字典中字符键的值替换字符串中的所有字符 [英] C# Replace all characters in string with value of character key in dictionary

问题描述

我有这本字典

Dictionary<char, string> keys = new Dictionary<char, string>();
keys.Add("a", "23");
keys.Add("A", "95");
keys.Add("d", "12");
keys.Add("D", "69");

，例如此字符串

string text = "Dad";

我想用字典键和值对字符串加密！
最终的加密字符串将为:
692312

i want to encrypt the string with dictionary keys and values!
the final encrypted string will be:
692312

有人可以帮忙吗?！

推荐答案

我建议使用 Linq 和 string.Concat :

// Dictionary<string, string> - actual keys are strings
Dictionary<string, string> keys = new Dictionary<string, string>();

keys.Add("a", "23");
keys.Add("A", "95");
keys.Add("d", "12");
keys.Add("D", "69");

string result = string.Concat(text.Select(c => keys[c.ToString()]));

一个更好的设计是将 keys 声明为 Dictionary< char，string> :

a better design is to declare keys as Dictionary<char, string>:

Dictionary<char, string> keys = new Dictionary<char, string>() {
  {'a', "23"},
  {'A', "95"},
  {'d', "12"},
  {'D', "69"},    
};

...

string result = string.Concat(text.Select(c => keys[c]));

编辑:证明每个字符被编码为固定长度字符串(示例中为 2 )很容易解码:

proving that each character is encoded as a fixed length string (2 in the example) it's easy to decode:

Dictionary<string, char> decode = keys
  .ToDictionary(pair => pair.Value, pair => pair.Key);

int fixedSize = decode.First().Key.Length;

string decoded = string.Concat(Enumerable
  .Range(0, result.Length / fixedSize)
  .Select(i => decode[result.Substring(i * fixedSize, fixedSize)]));

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