linq where subsection的条件

Question

我们如何将where条件添加到linq subselect查询中。

即

List<CallLog> callLog = CallLog.SampleData(); 
List<Contacts> contacts = Contacts.SampleData(); 


var q = from call in callLog 
     where call.Incoming == true 
     group call by call.Number into g 
     select new contacts { 
           contact.FirstName = g.FirstName, 
           contact.LastName = g.LastName, 
          Count = g.Count(), 
          Avg = g.Average(c => c.Duration) <--- WHERE c.Duration > 5, 
          Total = g.Sum(c => c.Duration) <--- WHERE c.Duration >= 60 
          }; 

我们如何添加一个 “Where条件”，如上图所示的LINQ声明？

Answer 1

只需在您所描述的条款中添加Where方法！

Avg = g.Where(c => c.Duration > 5).Average(c => c.Duration), 
Total = g.Where(c => c.Duration >= 60).Sum(c => c.Duration) 

Answer 2

你几乎拥有了：

var q = from call in callLog 
     where call.Incoming == true 
     group call by call.Number into g 
     select new contacts { 
       contact.FirstName = g.FirstName, 
       contact.LastName = g.LastName, 
          Count = g.Count(), 
          Avg = g.Where(c => c.Duration > 5).Average(c => c.Duration), 
          Total = g.Where(c => c.Duration >= 60).Sum(c => c.Duration) 
      };