/// 
    /// Range Helper    /// 
    /// 
         public class RangeHelper
     
       where T : IComparable
      
           {        /// 
       
        /// 为val返回指定范围内合法的值        /// 
        /// 
               /// 
               /// 
               /// 
               public static T ValidateRange(T val, T min, T max)        {            val = val.CompareTo(min) < 0 ? min : val;            val = val.CompareTo(max) > 0 ? max : val;            return val;        }    }
      
     

eg.

CurrentPage = RangeHelper
     
      .ValidateRange(CurrentPage, 1, TotalPage);
     

 

IComparable.CompareTo 方法用法说明

https://msdn.microsoft.com/zh-cn/library/system.icomparable.compareto.aspx