LINQ to SQL-左外部联接，两个联接不起作用

Question

In the following LINQ Query I need to display All the customers including the customers that have not placed any order but whose order is priced more than $100. But my following LINQ Query is returning all the customers regardless of their order price. It seems to be ignoring my Where(ord => ord.price > 100) clause in the LINQ query below. What I may be doing wrong?

Models :

public class Customer
{
   public int CustomerId { get; set; }
   public string CustName{ get; set; }
}

public class Order
{
   public int OrderId { get; set; }
   public int CustomerId { get; set; }
   public float price  { get; set; }
}

LINQ Query :

var Query1 = from c in Customers
             join ord in Orders on c.CustomerId equals ord.CustomerId into cord into cord
             from t in cord.Where(ord => ord.price > 100).DefaultIfEmpty()
             select new {CustName= c.Name, OrderID = (t == null ? 0 : t.OrderId)};

SQL Query :

I want to translate following T-SQL query into LINQ query:

SELECT c.Name, OrderID
FROM Customers c
LEFT OUTER JOIN Orders ord
    ON c.CustomerID = ord.CustomerID
    AND ord.Price > 100

Answer 1

Well, I don't have your data to be able to verify this, but one issue that jumps out at me is you're not specifying the field (CustomerId) on which to join the two collections.

Try modifying your query like this: (adding on c.CustomerId equals ord.CustomerId )

var Query1 = from c in Customers
             join ord in Orders on c.CustomerId equals ord.CustomerId into cord
               from t in cord.DefaultIfEmpty()
             where t.price > 100
             select new {CustName = c.Name, OrderID = (t == null ? 0 : t.OrderId)};