保存更改不保存

Question

有以下代码 -

var employees = context.Employees.Where(e => e.Department.Name == "Engineering" || e.Department.Name == "Tool Design" || e.Department.Name == "Marketing" || e.Department.Name == "Information Services")

                .OrderBy(e => e.FirstName)

                .ThenBy(e => e.LastName)

                .Select(e => new

                {

                    employeeFullInfo = $"{e.FirstName} {e.LastName} (${e.Salary * 12 / 100 + e.Salary:F2})"

                   //firstName = e.FirstName,

                   //lastName = e.LastName,

                   //Salary = e.Salary * 12 / 100 + e.Salary

                }).ToList();

 context.SaveChanges();

当我调用 saveChanges 方法时，数据库中什么也没发生，为什么？我希望每位员工加薪 12%，但在数据库中什么也没发生