更好地利用哈希表或交换机的情况下 [英] Better use HashTable or switch case

问题描述

我不知道哪一个更好。我需要解析的输入字符串的每一个字符，并获得用于该字符一个替换字符串。对于某些对象的所有字母数字字符被允许使用这样的switch / case会造成大量的代码，并降低可读性和可维护性，但我可以用一个静态方法。使用哈希表也需要大量的代码

I'm not sure which one is better. I need to parse each character of an input string and get a replacing string for the character. For some objects all alphanumeric characters are allowed so using switch/case will cause a lot of code and reduce readability and maintainability but I can use a static method. Using a HashTable also requires a lot of code

使用静态方法：

 private static string EncodeChar(char c)
    {
        var symbols = string.Empty;

        switch (c)
        {
            case '0':
                symbols = "Test";
                break;
            case '1':
                symbols = "Hello";
                break;
            [...]
        }

        symbols;
    }

使用哈希表：

private static Hashtable table = CreateTable();

private static Hashtable CreateTable()
{
    var table = new HashTable();
    table.Add('0',"Test");
    table.Add('1', "Hello");
    [...]
    return table;
}

private static string EncodeChar(char c)
{
    return table.ContainsKey(c) ? table[c].ToString() : string.Empty;
}

编码方式：

The Encode method:

public void Encode()
{
    string output = string.Empty;

    for (int i = 1; i < Data.Length; i++)
    {
        output = string.Concat(output, EncodeChar(Data[i]));
    }

    EncodedData = output;
}

有什么优势/关于性能和内存分配缺点是什么？

What are the advantages/disadvantages concerning performance and memory allocation?

推荐答案

我会使用的HashTable ，因为代码的可读性和可维护性：你有一天决定从一个XML文件加载托换弦，这样你就不会改变代码来改变映射。

I'd use the HashTable, because the code is more readable and maintainable: you could one day decide to load the subtitution strings from an XML file, so that you won't change the code to change the mappings.

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