【CSharp】随机生成字符串

代码示例

/// <summary> 随机生成字符串 </summary>
public class RandomStringBuilderUtility
{
    /// <summary> 生成随机字符串 </summary>
    /// <param name="length"> 字符串的长度 </param>
    /// <returns> </returns>
    public static string Create(int length)
    {
        // 创建一个StringBuilder对象存储密码
        StringBuilder sb = new StringBuilder();
        //使用for循环把单个字符填充进StringBuilder对象里面变成14位密码字符串
        for (int i = 0; i < length; i++)
        {
            Random random = new Random(Guid.NewGuid().GetHashCode());
            //随机选择里面其中的一种字符生成
            switch (random.Next(3))
            {
                case 0:
                    //调用生成生成随机数字的方法
                    sb.Append(createNum());
                    break;

                case 1:
                    //调用生成生成随机小写字母的方法
                    sb.Append(createSmallAbc());
                    break;

                case 2:
                    //调用生成生成随机大写字母的方法
                    sb.Append(createBigAbc());
                    break;
            }
        }
        return sb.ToString();
    }

    /// <summary> 生成单个大写随机字母 </summary>
    private static string createBigAbc()
    {
        //A-Z的 ASCII值为65-90
        Random random = new Random(Guid.NewGuid().GetHashCode());
        int num = random.Next(65, 91);
        string abc = Convert.ToChar(num).ToString();
        return abc;
    }

    /// <summary> 生成单个随机数字 </summary>
    private static int createNum()
    {
        Random random = new Random(Guid.NewGuid().GetHashCode());
        int num = random.Next(10);
        return num;
    }

    /// <summary> 生成单个小写随机字母 </summary>
    private static string createSmallAbc()
    {
        //a-z的 ASCII值为97-122
        Random random = new Random(Guid.NewGuid().GetHashCode());
        int num = random.Next(97, 123);
        string abc = Convert.ToChar(num).ToString();
        return abc;
    }
}