How to Efficiently Convert Numbers to Arbitrary Bases in .NET?

In the .NET, the number was effectively converted into any advancement

Converting decimal numbers into any other in -system is a common task in programming. Although the .NET provides a method to convert to a limited transmission set, developers usually need a more flexible method, which supports any advancement and any character set.

Convert.ToString Custom conversion method

In order to convert numbers into any advancement, you can implement a custom method, which iterates the number in the target progress. This is a simplified version of this method:

This method uses the value to be converted and a character array, which represents the characters in the target inlet. It repeats the calculation value except for the remaining number of the target and adds the corresponding character to the result string.

<code class="language-csharp">public static string IntToString(int value, char[] baseChars)
{
    string result = string.Empty;
    int targetBase = baseChars.Length;

    do
    {
        result = baseChars[value % targetBase] + result;
        value = value / targetBase;
    } 
    while (value > 0);

    return result;
}</code>

Use examples

To use this method, you can pass the value of the value of the value and the target, for example:

Performance Precautions

<code class="language-csharp">// 转换为二进制
string binary = IntToString(5, new char[] { '0', '1' });

// 转换为十六进制
string hex = IntToString(42, 
    new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
                 'A', 'B', 'C', 'D', 'E', 'F'});

// 转换为六十进制
string sexagesimal = IntToString(42, 
    new char[] { '0','1','2','3','4','5','6','7','8','9',
    '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',
    'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x'});</code>

The above method is connected to construct the result string with a string. For large numbers, this may be slow. The improved version will use array buffer to accumulate characters.

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