C#自定义函数NetxtString生成随机字符串

下面就为大家讲解一下如何在C#中自定义函数NetxtString生成随机字符串。

1、概述

NetxtString是一个C#字符串扩展类，提供了生成随机字符串的方法，可以指定生成字符串的长度和字符集。下面是该类的源码：

public static class NetxtString
{
    private static Random random = new Random();
    private static char GetRandomChar(string[] charSet)
    {
        int index = random.Next(0, charSet.Length - 1);
        return charSet[index].ToCharArray()[0];
    }
    public static string Generate(int length, string[] charSet)
    {
        string generated = "";
        for (int i = 0; i < length; i++)
        {
            generated += GetRandomChar(charSet);
        }
        return generated;
    }
}

该类提供了一个Generate方法，在该方法中可以指定生成字符串的长度和字符集。

2、使用

接下来，我们来演示一下如何使用NetxtString生成随机字符串。

示例一

我们先来生成10位数字的随机字符串。示例代码如下：

string[] charSet = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9" };
string randomString = NetxtString.Generate(10, charSet);
Console.WriteLine(randomString);

在上面的示例代码中，我们先定义了字符集，即由数字0-9组成的数组。然后调用NetxtString的Generate方法，指定生成字符串的长度为10，字符集为上面定义的字符集。最后输出生成的随机字符串。由于字符集中只包含0-9的数字字符，因此生成的字符串也只包含数字字符。

示例二

接下来，我们再来通过随机生成字母和数字的方式，生成12位随机字符串。示例代码如下：

string[] charSet = {"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",
                    "Y","Z"};
string randomString = NetxtString.Generate(12, charSet);
Console.WriteLine(randomString);

在上面的示例代码中，我们定义了一个字符集，包含数字0-9和大小写字母a-z和A-Z。然后调用NetxtString的Generate方法，指定生成字符串的长度为12，字符集为上面定义的字符集。最后输出生成的随机字符串。

3、总结

到这里，我们已经演示了如何在C#中使用自定义函数NetxtString生成随机字符串。使用该函数非常简单，只需指定生成字符串的长度和字符集即可。