使用.NET Core實(shí)現(xiàn)餓了嗎拆紅包功能

public class RedPacketsInfo
{
/// <summary>
/// 最大消費(fèi)金額
/// </summary>
public int MaxAmount { get; set; }
/// <summary>
 /// 最小消費(fèi)金額
 /// </summary>
 public int MinAmount { get; set; }
 /// <summary>
 /// 紅包金額
 /// </summary>
 public int TotalAmount { get; set; }
 /// <summary>
 /// 紅包可被分割的數(shù)量
 /// </summary>
 public int RedPacketQuantity { get; set; }
}

private static List<RedPacketsInfo> GetRedPackets()
{
 return new List<RedPacketsInfo>()
 {
 new RedPacketsInfo
 {
 MinAmount = 1000,
 MaxAmount = 2000,
 RedPacketQuantity = 5,
 TotalAmount=1000
 },
 new RedPacketsInfo
 {
 MinAmount = 2000,
 MaxAmount = 3000,
 RedPacketQuantity = 5,
 TotalAmount=1000
 },
 new RedPacketsInfo
 {
 MinAmount = 4000,
 MaxAmount = 6000,
 RedPacketQuantity = 5,
 TotalAmount=1000
 },
 new RedPacketsInfo
 {
 MinAmount = 6000,
 MaxAmount = 8000,
 RedPacketQuantity = 5,
 TotalAmount=1000
 },
 new RedPacketsInfo
 {
 MinAmount = 10000,
 MaxAmount = int.MaxValue,
 RedPacketQuantity = 5,
 TotalAmount=1000
 }
 };
}

public class SharedRedPacket
{
 /// <summary>
 /// 分享人UserId
 /// </summary>
 public int SenderUserId { get; set; }
 /// <summary>
 /// 分享時(shí)間
 /// </summary>
 public DateTime SendTime { get; set; }
 public List<RobbedRedPacket> RobbedRedPackets { get; set; }
}
public class RobbedRedPacket
{
 /// <summary>
 /// 搶到紅包的人的UserId
 /// </summary>
 public int UserId { get; set; }
 /// <summary>
 /// 搶到的紅包金額
 /// </summary>
 public int Amount { get; set; }
 /// <summary>
 /// 搶到時(shí)間
 /// </summary>
 public DateTime RobbedTime { get; set; }
}

//紅包隨機(jī)拆分
Random ran = new Random();
List<double> randoms = new List<double>(redPacketsList.Count);
for (int i = 0; i < redPacketsInfo.RedPacketQuantity - 1; i++)
{
 int max = (totalAmount - (redPacketsInfo.RedPacketQuantity - i)) * 1;
 int result = ran.Next(1, max);
 randoms.Add(result);
 totalAmount -= result;
}
randoms.Add(totalAmount);

//正太分布處理
for (int i = 0; i < redPacketsInfo.RedPacketQuantity; i++)
{
 double a = Math.Sqrt(Math.Abs(2 * Math.Log(randoms[i], Math.E)));
 double b = Math.Cos(2 * Math.PI * randoms[i]);
 randoms[i] = a * b * 0.3 + 1;
}

//生成最終的紅包數(shù)據(jù)
double d = originalTotal / randoms.Sum();
SharedRedPacket sharedRedPacket = new SharedRedPacket();
sharedRedPacket.RobbedRedPackets = new List<RobbedRedPacket>(redPacketsList.Count);
for (int i = 0; i < redPacketsInfo.RedPacketQuantity - 1; i++)
{
 sharedRedPacket.RobbedRedPackets.Add(new RobbedRedPacket
 {
 Amount = (int)Math.Round(randoms[i] * d, 0)
 });
}
sharedRedPacket.RobbedRedPackets.Add(new RobbedRedPacket
{
 Amount = originalTotal - sharedRedPacket.RobbedRedPackets.Sum(p => p.Amount)
});

Console.WriteLine("是否分享輸入Y分享成功，輸入N退出");
 string result = Console.ReadLine();
 if (result == "Y")
 {
 var leftRedPacket = sharedRedPacket.RobbedRedPackets.Where(p => p.UserId <= 0).ToList();
 var robbedRedPacket = leftRedPacket[new Random().Next(1, leftRedPacket.Count + 1)];
 Console.WriteLine("搶到的到紅包金額是：" + robbedRedPacket.Amount);
 Console.WriteLine("-------------------------------------------------------");
 }