C＃相当于VB LINQ查询

Question

的我在VB下面的查询，但我不知道怎么把它翻译成C＃synatax

Dim q = From c In db.Customers 
     Group Join o In db.Orders On c.CustomerID Equals o.CustomerID Into orders = Group 
     Select New With {c.ContactName, .OrderCount = orders.Count()} 

谢谢

Answer 1

这其实很容易。你一定要放下“集团”：

var q = from c in db.Customers 
     join o in db.Orders on c.CustomerID equals o.CustomerID into orders 
     select new { c.ContactName, OrderCount = orders.Count() }; 

或者，如果你正在寻找的lambda语法：

var q = db.Customers.GroupJoin(db.Orders, 
           o => o.CustomerID, 
           c => c.CustomerID, 
           (c, orders) => 
            new 
            { 
             c.ContactName, 
             OrderCount = orders.Count() 
            }); 

Answer 2

Dim q = From c In db.Customers 
    Group Join o In db.Orders On c.CustomerID Equals o.CustomerID Into orders = Group 
    Select New With {c.ContactName, .OrderCount = orders.Count()} 

var q = 
    from c in db.Customers 
    join o in db.Orders on c.CustomerID equals o.CustomerID into orders 
    select new {c.ContactName, .OrderCount = orders.Count()};