生成随机数

Question

随机数 从一个记录集中生成一个随机数，该怎么实现？
记录集： 0->9;a->z;A->Z

Answer 1

/// <summary>
/// 从定义的库中去设定的个数的随机字符串
/// </summary>
/// <param name="passchars">字符串库</param>
/// <param name="pwdlen">随机数的数目</param>
/// <returns>随机字符串</returns>
public static string MakeRandChars(string passchars,int pwdlen)
{
//string passchars="0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
string BmpStr = "";
int iRandNum;
Random rnd = new Random();
for(int i=0;i<pwdlen;i++)
{
iRandNum = rnd.Next(passchars.Length);
BmpStr += passchars[iRandNum];
}
return BmpStr;
}

Answer 2

0-9 new System.Random().Next(10)
A-Z
int t=new System.Random().Next(65,90);
char c=(char)t;
a-z
int t=new System.Random().Next(97,122);
char c=(char)t;

Answer 3

foyuan（）回答的很好
0-9 new System.Random().Next(10)
A-Z
int t=new System.Random().Next(65,90);
char c=(char)t;
a-z
int t=new System.Random().Next(97,122);
char c=(char)t;

Answer 4

到底是要数字还是字符串?如果是字符串mylocoy() 已经帮你实现了
如果是数字那总得有个要求吧

Answer 5

/// <summary>
        /// 生成随机数
        /// </summary>
        /// <param name="iCnt"></param>
        /// <returns></returns>
        public static string getRandom(int iCnt)
        {
            string allChar = "a,b,c,d,e,f,g,h,j,k,l,m,n,p,q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,J,K,L,M,N,P,Q,R,S,T,U,V,W,X,Y,Z,2,3,4,5,6,7,8,9";
            string[] allCharArray = allChar.Split(',');
            string randomCode = "";
            int temp = -1;
            Random random = new Random(); ;
            for (int i = 0; i < iCnt; i++)
            {
                if (temp != -1)
                {
                    random = new Random(i * temp * ((int)DateTime.Now.Ticks));
                }
                int t = random.Next(56);
                if (temp == t)
                {
                    return CreateRandomCode(iCnt);
                }
                temp = t;
                randomCode += allCharArray[t];
            }
            return randomCode;        }        /// <summary>
        /// 生成一个字母
        /// </summary>
        /// <param name="iCnt"></param>
        /// <returns></returns>
        private static string CreateRandomCode(int iCnt)
        {
            string allChar = "a,b,c,d,e,f,g,h,j,k,l,m,n,p,q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,J,K,L,M,N,P,Q,R,S,T,U,V,W,X,Y,Z,2,3,4,5,6,7,8,9";
            string[] allCharArray = allChar.Split(',');
            int i = 100;
            while (i > 55)
            {
                i = Convert.ToInt32(DateTime.Now.ToString("ffffff").Substring(4, 2));
            }
            return allCharArray[i];
        }