更好地使用 HashTable 或 switch case

Better use HashTable or switch case(更好地使用 HashTable 或 switch case)

问题描述

我不确定哪个更好.我需要解析输入字符串的每个字符并获取该字符的替换字符串.对于某些对象，所有字母数字字符都是允许的，因此使用 switch/case 会导致大量代码并降低可读性和可维护性，但我可以使用静态方法.使用HashTable也需要很多代码

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;
}

编码方法:

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

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

    EncodedData = output;
}

在性能和内存分配方面有哪些优势/劣势?

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

推荐答案

我会使用 HashTable，因为代码更具可读性和可维护性:有一天你可以决定加载替代字符串来自 XML 文件，这样您就不会更改代码来更改映射.

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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