实例介绍
【实例简介】
【实例截图】
【实例截图】
【核心代码】
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
namespace RandomExtract
{
class Program
{
static void Main(string[] args)
{
PrizeMathRandom a = new PrizeMathRandom();
a.prizeRandom();
#region 1000、10000次随机抽取，每次抽取6个
////从集合中随机抽取个数
//const ushort COUNT = 1;
////循环次数
//const int FOR_COUNT = 10000;//10000
//RandomController rc = new RandomController(COUNT);
////累积器
//Dictionary<char, int> result = new Dictionary<char, int>();
////随机数生成器
//Random rand = new Random();
////循环生成随机数
//for (int i = 0; i < FOR_COUNT; i )
//{
// //char[] rands = rc.RandomExtract(rand);
// char[] rands = rc.ControllerRandomExtract(rand);
// for (int j = 0; j < COUNT; j )
// {
// char item = rands[j];
// if (result.ContainsKey(item))
// result[item] = 1;
// else
// result.Add(item, 1);
// }
// // Thread.Sleep(5);
//}
////Console.WriteLine("\t\t出现次数\t占总共出现次数百分比");
////foreach (KeyValuePair<char, int> item in result)
////{
//// Console.WriteLine(item.Key "\t\t" item.Value.ToString() "\t\t" ((double)item.Value / (double)(FOR_COUNT * COUNT)).ToString("0.00%"));
////}
//Dictionary<char, ushort> items = new Dictionary<char, ushort>();
//for (int i = 0, j = rc.datas.Count; i < j; i )
//{
// items.Add(rc.datas[i], rc.weights[i]);
//}
//Console.WriteLine("\t\t出现次数\t占总共出现次数百分比\t权值");
//foreach (KeyValuePair<char, int> item in result)
//{
// Console.WriteLine(item.Key "\t\t" item.Value.ToString() "\t\t" ((double)item.Value / (double)(FOR_COUNT * COUNT)).ToString("0.00%") "\t\t\t" items[item.Key]);
//}
#endregion
Console.ReadLine();
}
}
public class Singleton
{
private static Singleton _Singleton = null;
private static object Singleton_Lock = new object();
public static Singleton CreateInstance()
{
if (_Singleton == null) //双if lock
{
lock (Singleton_Lock)
{
Console.WriteLine("路过。");
if (_Singleton == null)
{
Console.WriteLine("被创建。");
_Singleton = new Singleton();
}
}
}
return _Singleton;
}
}
public class RandomController
{
#region Properties
private int _Count;
/// <summary>
/// 随机抽取个数
/// </summary>
public int Count
{
get { return _Count; }
set { _Count = value; }
}
#endregion
#region Member Variables
/// <summary>
/// 待随机抽取数据集合
/// </summary>
public List<char> datas = new List<char>(
new char[]{
'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'
});
/// <summary>
/// 对应奖项权值
/// </summary>
public List<ushort> weights = new List<ushort>(
new ushort[]{
//1,2,3,4,5,6,
7,8,9,10
//1,1,1,1,1,1,
//1,1,1,1,1,1,
//1,1
});
#endregion
/// <summary>
/// 构造函数
/// </summary>
/// <param name="count">随机抽取个数</param>
public RandomController(ushort count)
{
if (count > 26)
throw new Exception("抽取个数不能超过数据集合大小！！");
_Count = count;
}
#region 普通随机抽取
/// <summary>
/// 随机抽取
/// </summary>
/// <param name="rand">随机数生成器</param>
/// <returns></returns>
public char[] RandomExtract(Random rand)
{
List<char> result = new List<char>();
if (rand != null)
{
for (int i = Count; i > 0;)
{
char item = datas[rand.Next(25)];
if (result.Contains(item))
continue;
else
{
result.Add(item);
i--;
}
}
}
return result.ToArray();
}
#endregion
#region 受控随机抽取
/// <summary>
/// 随机抽取
/// </summary>
/// <param name="rand">随机数生成器</param>
/// <returns></returns>
public char[] ControllerRandomExtract(Random rand)
{
List<char> result = new List<char>();
if (rand != null)
{
//临时变量
Dictionary<char, int> dict = new Dictionary<char, int>(4);
//为每个项算一个随机数并乘以相应的权值
for (int i = datas.Count - 1; i >= 0; i--)
{
dict.Add(datas[i], rand.Next(100) * weights[i]);
}
//排序
List<KeyValuePair<char, int>> listDict = SortByValue(dict);
//拷贝抽取权值最大的前Count项
foreach (KeyValuePair<char, int> kvp in listDict.GetRange(0, Count))
{
result.Add(kvp.Key);
}
}
return result.ToArray();
}
#endregion
#region Tools
/// <summary>
/// 排序集合
/// </summary>
/// <param name="dict"></param>
/// <returns></returns>
private List<KeyValuePair<char, int>> SortByValue(Dictionary<char, int> dict)
{
List<KeyValuePair<char, int>> list = new List<KeyValuePair<char, int>>();
if (dict != null)
{
list.AddRange(dict);
list.Sort(
delegate (KeyValuePair<char, int> kvp1, KeyValuePair<char, int> kvp2)
{
return kvp2.Value - kvp1.Value;
});
}
return list;
}
#endregion
}
public class PrizeMathRandom
{
Random rd = new Random(Guid.NewGuid().GetHashCode());
public int GetPrizeIndex(List<Prize> prizes)
{
int random = -1;
try
{
//计算总权重
double sumWeight = prizes.Sum(x => x.prize_weight);
//产生随机数
double randomNumber;
randomNumber = rd.NextDouble();
//根据随机数在所有奖品分布的区域并确定所抽奖品
double d1 = 0;
double d2 = 0;
for (int i = 0; i < prizes.Count; i )
{
d2 = Convert.ToDouble(prizes[i].prize_weight) / sumWeight;
if (i == 0)
{
d1 = 0;
}
else
{
d1 = Convert.ToDouble(prizes[i - 1].prize_weight) / sumWeight;
}
if (randomNumber >= d1 && randomNumber <= d2)
{
random = i;
break;
}
}
}
catch (Exception e)
{
Console.WriteLine("生成抽奖随机数出错，出错原因：" e.Message);
}
return random;
}
public void prizeRandom()
{
int i = 0;
PrizeMathRandom a = new PrizeMathRandom();
List<Prize> prizes = new List<Prize>() {
new Prize(){prize_name="奖1",prize_weight=1},
new Prize(){prize_name="奖2",prize_weight=2},
new Prize(){prize_name="奖3",prize_weight=4},
new Prize(){prize_name="奖4",prize_weight=2},
new Prize(){prize_name="奖5",prize_weight=1}
};
int[] result = new int[prizes.Count];
Console.WriteLine("抽奖开始");
int count = 50;
for (i = 1; i <= count; i )// 打印100个测试概率的准确性
{
int selected = GetPrizeIndex(prizes);
// Console.WriteLine("第" i "次抽中的奖品为：" prizes[selected].prize_name);
result[selected] ;
// Console.WriteLine("--------------------------------");
}
Console.WriteLine("抽奖结束");
Console.WriteLine("总数：" count "，每种奖品抽到的数量为：");
for (int j = 0; j < prizes.Count; j )
{
Console.WriteLine(prizes[j].prize_name "：" result[j] ";权重数：" prizes[j].prize_weight "概率：" result[j] * 1.0 / count);
}
}
}
public class Prize
{
public int id;//奖品id
public String prize_name;//奖品名称
public int prize_amount;//奖品（剩余）数量
public int prize_weight;//奖品权重
//getter、setter
}
}
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