一线匿名方法

Question

I have a question. Consider that scenerio:

    public override string Encrypt(string input)
    { 
        Func<char, char> encryption = (c) => (char)chars[(c * k1 + k0) % 26]; 

        string result = string.Empty;
        foreach(char c in input)
            result += encryption(c);

        return result;
    }

My question is, can we change that result += encryption(c) line into something like in Func<char, char> declaration? Can we write this anonymous method in one line ?

Answer 1

您可以执行以下操作：

result = string.Concat(input.Select(c => encryption(c)))

Answer 2

You can try using Linq , ie

public override string Encrypt(string input)
{ 
    Func<char, char> encryption = (c) => (char)chars[(c * k1 + k0) % 26]; 

    return string.Concat(input.Select(c => encryption(c)));
}

We can even get rid of encryption :

public override string Encrypt(string input) => 
   string.Concat(input.Select(c => (char)chars[(c * k1 + k0) % 26]));

Answer 3

并不是说它非常易读，而是将整个方法简化为一行：

public override string Encrypt(string input) => string.Concat(input.Select(c => (char)chars[(c * k1 + k0) % 26]));