C#生成不重复的随机数

using System;
using System.Collections.Generic;
using System.Text;

namespace CreateRandomNo
{
    class RandomCreate
    {

        /// <summary>
        /// 生成数字随机数
        /// </summary>
        /// <param name="numCount"></param>
        /// <returns></returns>
        public static string GetNumPwd(int numCount)
        {
            string allNumers = "0123456789";

            StringBuilder sb = new StringBuilder();

            for (int i = 0; i < numCount; i++)
            {
                sb.Append(allNumers[new Random(Guid.NewGuid().GetHashCode()).Next(0, allNumers.Length - 1)]);
            }

            return sb.ToString();
        }

        /// <summary>
        /// 生成大写字母随机数
        /// </summary>
        /// <param name="abcCount"></param>
        public static string GetABCPwd(int abcCount)
        {
            string allWords = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

            StringBuilder sb = new StringBuilder();

            for (int i = 0; i < abcCount; i++)
            {
                sb.Append(allWords[new Random(Guid.NewGuid().GetHashCode()).Next(0, allWords.Length - 1)]);
            }

            return sb.ToString();
        }

        /// <summary>
        /// 生成小写字母随机数
        /// </summary>
        /// <param name="abcCount"></param>
        public static string GetabcPwd(int abcCount)
        {
            string allWords = "abcdefghijklmnopqrstuvwxyz";

            StringBuilder sb = new StringBuilder();

            for (int i = 0; i < abcCount; i++)
            {
                sb.Append(allWords[new Random(Guid.NewGuid().GetHashCode()).Next(0, allWords.Length - 1)]);
            }

            return sb.ToString();
        }

        /// <summary>
        /// 生成混合随机数
        /// </summary>
        /// <param name="allCount"></param>
        /// <returns></returns>
        public static string GetMixPwd(int allCount)//生成混合随机数
        {
            string allNumWord = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";

            StringBuilder sb = new StringBuilder();

            for (int i = 0; i < allCount; i++)
            {
                sb.Append(allNumWord[new Random(Guid.NewGuid().GetHashCode()).Next(0, allNumWord.Length - 1)]);
            }

            return sb.ToString();
        }

        /// <summary>
        /// 自己控制输入的符号和随机生成的位数
        /// </summary>
        /// <param name="refValue">输入的符号</param>
        /// <param name="refRandomCount">随机生成的位数</param>
        /// <returns></returns>
        public static string GetRandomNo(string refValue,int refRandomCount)
        {
            string value = refValue;
            int randomCount = refRandomCount;

            StringBuilder sb = new StringBuilder();

            for (int i = 0; i < randomCount; i++)
            {
                sb.Append(value[new Random(Guid.NewGuid().GetHashCode()).Next(0, value.Length - 1)]);
            }

            return sb.ToString();

        }
    }
}

后一个方法是自己添加上的用于用户控制显示的符号如[]-$#都可以的,其实对于上述的方法还可以把它们全部合并到一个方法中,但是最近受设计模式的影响,功能单一还是比较好些.这样以后修改起来也比较方便.