C#实现微信红包功能

本文实例为大家分享了C#仿微信红包功能的具体代码，供大家参考，具体内容如下

Program.cs代码:

class Program
{
 static void Main(string[] args)
 {
  //初始化要发起的红包基础数据
  double total = 100;
  int num = 50;
  double min = 0.01;
  string temp;
  bool flag = false;
  Console.WriteLine(string.Format("是否需要自定义红包金额和数量（默认{0}元/{1}人）Y/N：", total, num));
  temp = Console.ReadLine();
  if (temp.Trim().ToLower().Equals("y") || temp.Trim().ToLower().Equals("yes"))
  {
   Console.WriteLine("请输入你要发起的红包金额：");
   do
   {
    temp = Console.ReadLine();
    flag = double.TryParse(temp, out total);
    if (!flag)
    {
     Console.WriteLine("金额必须为整数或小数，请重新输入：");
    }
   } while (!flag);
   Console.WriteLine("请输入你要发起的红包个数：");
   do
   {
    temp = Console.ReadLine();
    flag = int.TryParse(temp, out num);
    if (!flag)
    {
     Console.WriteLine("红包个数必须为整数，请重新输入：");
    }
   } while (!flag);
  }

total -= min * num;
  if (total < 0)
  {
   Console.WriteLine("抱歉，你的金额不足！");
   return;
  }

//产生正态分布的随机红包金额，并计算相关的金额和数量保证数据的准确性
  double average = total / num;
  double variance = 1;
  Random u1 = new Random();
  Random u2 = new Random();
  double[] nums = new double[num];

for (int i = 0; i < num; i++)
  {
   double? result = total;
   if (i < num - 1 && total > 0)
   {
    do
    {
     result = Round((double)Normal(u1.NextDouble(), u2.NextDouble(), average, variance), 2);
    } while (result == null || result < 0);
    if (total > result)
    {
     total = (double)Round((total - (double)result), 2);
    }
    else
    {
     result = total;
     total = 0;
    }
   }
   else if (i == num - 1)
   {
    total = 0;
   }
   nums[i] = Math.Round(min + (double)result, 2); //浮点运算问题，这里需要四舍五入数据才正确

Console.WriteLine(string.Format("第{0}个红包金额：{1}", i + 1, (min + result)));
   Console.WriteLine("剩余金额：" + ((i != num - 1 && total == 0) ? min * (num - i - 1) : total + (min * (num - i - 1))));
  }
  Console.WriteLine("最大金额：" + nums.Max());
  Console.WriteLine("最小金额：" + nums.Min());
  Console.WriteLine("总额：" + Round(nums.Sum(), 2));
  Console.WriteLine("初始方差：" + variance);
  Console.WriteLine("结果方差：" + Variance(nums));
  Console.WriteLine("按任意键退出！");

Console.ReadKey();
 }

/// <summary>
 /// 产生符合正态分布的随机数
 /// </summary>
 /// <param name="u1">正态分布第一个随机数</param>
 /// <param name="u2">正态分布第二个随机数</param>
 /// <param name="averageValue">正态期望(平均值)</param>
 /// <param name="variance">正态标准差(Math.Sqrt(方差))</param>
 /// <returns></returns>
 public static double? Normal(double u1, double u2, double averageValue, double variance)
 {
  double? result = null;
  try
  {
   result = averageValue + Math.Sqrt(variance) * Math.Sqrt((-2) * Math.Log(u1)) * Math.Sin(2 * Math.PI * u2);
  }
  catch (Exception)
  {
   result = null;
  }

return result;
 }

/// <summary>
 /// 求一组数据的方差
 /// </summary>
 /// <param name="list">要求的数组</param>
 /// <returns></returns>
 public static double Variance(double[] nums)
 {
  double average = nums.Sum() / nums.Length;
  double sum = 0;
  double variance = 0;
  foreach (double num in nums)
  {
   sum += Math.Pow((num - average), 2);
  }
  variance = sum / nums.Length;

return variance;
 }

/// <summary>
 /// 截取小数指定小数位，且不四舍五入
 /// </summary>
 /// <param name="originNum">要截取的小数</param>
 /// <param name="lastNum">截取小数后位数</param>
 /// <returns></returns>
 public static double? Round(double originNum, int lastNum)
 {
  double? result = null;
  int index = originNum.ToString().IndexOf('.');
  if (index != -1)
  {
   string temp = originNum.ToString();
   result = Convert.ToDouble(temp.Substring(0, index + 1) + temp.Substring(index + 1, Math.Min(temp.Length - index - 1, lastNum)));
  }
  if (result == 0)
  {
   result = null;
  }
  else if (index == -1)
  {
   result = originNum;
  }

return result;
 }
}

运行结果：