c# - 日期数组，检查日期是否存在

Question

我有一个对象成员，

Member
 PropertyA
 PropertyZ
 Membership[] Memberships

Membership对象是

Membership
 PropertyA
 PropertyZ
 string Status
 DateTime? StartDate 
 DateTime? EndDate 

如果我现在有，

var members = GetAllMembers(DateTime.Now);

我想知道成员(member)今天是否有活跃成员(member)，

   // iterating through each member here
   if(member.Memberships.Any())
   {
       // check if user has any membership duration that falls into 
       // today's date and membership status is also "active"
   }

问题是，

我不确定如何检查属于今天日期和成员(member)状态的任何成员(member)期限是否也是“有效”

Answer 1

检查目标 dt(DateTime.Now) 是否在 StartDate 和 EndDate 之间:

if (member.Memberships.Any(x=>targetDt.Ticks > x.StartDate.Ticks && targetDt.Ticks < x.EndDate.Ticks && x.Status=="Active"))
{
    // Has membership on targetDt.
}