C#的随机数生成

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  public class RandomHelper
    {
        //随机数对象
        private Random _random;
 
        #region 构造函数
        /// <summary>
        /// 构造函数
        /// </summary>
        public RandomHelper()
        {
            //为随机数对象赋值
            this._random = new Random();
        }
        #endregion
 
        #region 生成一个指定范围的随机整数
        public int GetRandomInt(int minNum, int maxNum)
        {
            return this._random.Next(minNum, maxNum);
        }
        #endregion
 
        #region 生成一个0.0到1.0的随机小数
        public double GetRandomDouble()
        {
            return this._random.NextDouble();
        }
        #endregion
 
        #region 对一个数组进行随机排序
        public void GetRandomArray<T>(T[] arr)
        {
            //对数组进行随机排序的算法:随机选择两个位置，将两个位置上的值交换
 
            //交换的次数,这里使用数组的长度作为交换次数
            int count = arr.Length;
 
            //开始交换
            for (int i = 0; i < count; i++)
            {
                //生成两个随机数位置
                int randomNum1 = GetRandomInt(0, arr.Length);
                int randomNum2 = GetRandomInt(0, arr.Length);
 
                //定义临时变量
                T temp;
 
                //交换两个随机数位置的值
                temp = arr[randomNum1];
                arr[randomNum1] = arr[randomNum2];
                arr[randomNum2] = temp;
            }
        }
        #endregion

        #region 随机生成不重复数字字符串
        private int rep = 0;
        public string GenerateCheckCodeNum(int codeCount)
        {
            string str = string.Empty;
            long num2 = DateTime.Now.Ticks + this.rep;
            this.rep++;
            Random random = new Random(((int)(((ulong)num2) & 0xffffffffL)) | ((int)(num2 >> this.rep)));
            for (int i = 0; i < codeCount; i++)
            {
                int num = random.Next();
                str = str + ((char)(0x30 + ((ushort)(num % 10)))).ToString();
            }
            return str;
        }
	#endregion
 
        
        #region 随机生成字符串（数字和字母混和）
        public string GenerateCheckCode(int codeCount)
        {
            string str = string.Empty;
            long num2 = DateTime.Now.Ticks + this.rep;
            this.rep++;
            Random random = new Random(((int)(((ulong)num2) & 0xffffffffL)) | ((int)(num2 >> this.rep)));
            for (int i = 0; i < codeCount; i++)
            {
                char ch;
                int num = random.Next();
                if ((num % 2) == 0)
                {
                    ch = (char)(0x30 + ((ushort)(num % 10)));
                }
                else
                {
                    ch = (char)(0x41 + ((ushort)(num % 0x1a)));
                }
                str = str + ch.ToString();
            }
            return str;
        }
	#endregion
     

        #region 从字符串里随机得到，规定个数的字符串
        private string GetRandomCode(string allChar, int CodeCount)
        {
            //string allChar = "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"; 
            string[] allCharArray = allChar.Split(',');
            string RandomCode = "";
            int temp = -1;
            Random rand = new Random();
            for (int i = 0; i < CodeCount; i++)
            {
                if (temp != -1)
                {
                    rand = new Random(temp * i * ((int)DateTime.Now.Ticks));
                }

                int t = rand.Next(allCharArray.Length - 1);

                while (temp == t)
                {
                    t = rand.Next(allCharArray.Length - 1);
                }

                temp = t;
                RandomCode += allCharArray[t];
            }
            return RandomCode;
        }
        #endregion

      
 
 
    }