var result = from emp in employees
             join dept in departments
             on new { Source = emp.EmployeeID }
             equals new { Source = dept.EmployeeID };

我有一个例外：

The type of one of the expressions in the join clause is incorrect.
Type Inference Failed in a call to ‘join’.

谢谢

解决方法

var result = from department in departments
             where department.EmployeeID != null
             join employee in employees
             on department.EmployeeID.Value equals employee.EmployeeID
             select new { employee,department };

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