简单工厂模式:通过专门定义一个类来负责创建其他类的实例，被创建的实例通常都具有共同的父类。

场景：公司的一个彩票红包推广活动项目，需要随机生成彩票号码，目前有双色球和大乐透，品种后期可能会新增。

彩票基础类：

1 public abstract class LotBase 2     { 3         /// 
 4         /// 随机数生成器 5         /// 
 6         public static Random rand = new Random(); 7         //间隔符号 8         private string space = "-"; 9 10         /// 
11         /// 获取红球号码12         /// 
13         /// 
     14         protected abstract string GetRedche();15         /// 
16         /// 获取篮球号码17         /// 
18         /// 
     19         protected abstract string GetBlueche();20         /// 
21         /// 22         /// 
23         /// 
     24         protected string ToLotChe(List
     
       lotList)25         {26             StringBuilder lotChe = new StringBuilder();27             lotList.Sort();28             foreach (string item in lotList)29             {30                 lotChe.Append(item);31                 lotChe.Append(" ");32             }33             lotChe.Remove(lotChe.Length - 1, 1);34             return lotChe.ToString();35         }36         /// 
      
37         /// 获取彩票号码38         /// 
39         /// 
      40         public string GetLotChe()41         {42             return string.Format("{0}{1}{2}", GetRedche(), space, GetBlueche());43         }44     }
     

双色球:

1  public class LotSSQ : LotBase 2     { 3         /// 
 4         /// 双色球红球6个号码 5         /// 
 6         /// 
      7         protected override string GetRedche() 8         { 9             int index = 0;10             List
     
       redList = new List
      
        { "01", "02", "03", "04", "05", "06", "07", "08", "09", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "30", "31", "32", "33" };11             List
       
         redChe = new List
        
         ();12             for (int i = 0; i < 6; i++)13             {14                 index = rand.Next(redList.Count - 1);15                 redChe.Add(redList[index]);16                 redList.RemoveAt(index);17             }18             return ToLotChe(redChe);19         }20         /// 
         
21         /// 双色球篮球一个22         /// 
23         /// 
         24         protected override string GetBlueche()25         {26             string[] blueList = { "01", "02", "03", "04", "05", "06", "07", "08", "09", "10", "11", "12", "13", "14", "15", "16" };27             return blueList[rand.Next(15)];28         }29     }
        
       
      
     

大乐透:

1    public class LotDLT : LotBase 2     { 3         /// 
 4         /// 大乐透红球5个号码 5         /// 
 6         /// 
      7         protected override string GetRedche() 8         { 9             int index = 0;10             List
     
       redList = new List
      
        { "01", "02", "03", "04", "05", "06", "07", "08", "09", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "30", "31", "32", "33", "34", "35" };11             List
       
         redChe = new List
        
         ();12             for (int i = 0; i < 5; i++)13             {14                 index = rand.Next(redList.Count - 1);15                 redChe.Add(redList[index]);16                 redList.RemoveAt(index);17             }18             return ToLotChe(redChe);19         }20         /// 
         
21         /// 大乐透篮球2个号码22         /// 
23         /// 
         24         protected override string GetBlueche()25         {26             int index = 0;27             List
         
           blueList = new List
          
            { "01", "02", "03", "04", "05", "06", "07", "08", "09", "10", "11", "12" };28 List
           
             blueChe = new List
            
             ();29 for (int i = 0; i < 2; i++)30 {31 index = rand.Next(blueList.Count - 1);32 blueChe.Add(blueList[index]);33 blueList.RemoveAt(index);34 }35 return ToLotChe(blueChe);36 }37 }
            
           
          
         
        
       
      
     

彩票工厂类:

1  public class LotFactory 2     { 3         public static LotBase GetLot(string lotcode) 4         { 5             LotBase lotCheBase = null; 6             switch (lotcode) 7             { 8                 //双色球 9                 case "SSQ":10                     lotCheBase = new LotSSQ();11                     break;12                 //大乐透13                 case "DLT":14                     lotCheBase = new LotDLT();15                     break;16             }17             return lotCheBase;18         }19     }