主要要来做区间控制，比如查询订单，查询条件是创单时间 这区间就是开始-结束，

或者查询机票就是 出发- 到达

下面记录区间结构代码

1     /// 
 2     /// 区间 3     /// 
 4     /// 
      
       区间类型
       5     [Serializable] 6     [DataContract] 7     public struct Range
      
        8     { 9         /// 
       
10         /// The _lower.11         /// 
12         private T lower;13 14         /// 
       
15         /// The _upper.16         /// 
17         private T upper;18 19         /// 
       
20         /// Initializes a new instance of the 
         struct.21         /// 
22         /// 
       23         /// The lower.24         /// 25         /// 
       26         /// The upper.27         /// 28         public Range(T lower, T upper)29         {30             this.lower = lower;31             this.upper = upper;32         }33 34         /// 
       
35         /// 下限(时间开始)36         /// 
37         [DataMember]38         public T Lower39         {40             get { return this.lower; }41             set { this.lower = value; }42         }43 44         /// 
       
45         /// 上限(时间结束)46         /// 
47         [DataMember]48         public T Upper49         {50             get { return this.upper; }51             set { this.upper = value; }52         }53     }