Linq 实现左连接，右连接

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左连接：

var LeftJoin = from emp in ListOfEmployees

join dept in ListOfDepartment on emp.DeptID equals dept.ID into JoinedEmpDept

from dept in JoinedEmpDept.DefaultIfEmpty()

select new

                          {

　　　　　　　　　　EmployeeName = emp.Name,

　　　　　　　　　　DepartmentName = dept != null ? dept.Name : null 

                         };

右连接：

var RightJoin = from dept in ListOfDepartment

join employee in ListOfEmployees on dept.ID equals employee.DeptID into joinDeptEmp

from employee in joinDeptEmp.DefaultIfEmpty()

select new 

                           {

　　　　　　　　　　EmployeeName = employee != null ? employee.Name : null,

　　　　　　　　DepartmentName = dept.Name

              　　　　};

Linq 实现左连接，右连接

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原文地址：http://www.cnblogs.com/cllchaoblog/p/4328683.html