Customizing Entity Framework Objects - Entity Framework 6 Recipes - page 429

{
context.SaveChanges();
}
catch (Exception)
{
Console.WriteLine("Oops, tried to increase a salary too much!");
}
}
using (var context = new EFRecipesEntities())
{
Console.WriteLine();
Console.WriteLine("Employees");
foreach (var emp in context.Employees)
{
Console.WriteLine("{0} makes {1}/year", emp.Name,
emp.Salary.ToString("C"));
}
}
Console.WriteLine("Press any key to close...");
Console.ReadLine();
}
}
public partial class EFRecipesEntities
{
public override int SaveChanges()
{
var entries = this.ChangeTracker.Entries().Where(e => e.Entity is Employee && e.State ==
System.Data.Entity.EntityState.Modified);
foreach (var entry in entries)
{
var originalSalary = Convert.ToDecimal(
entry.OriginalValues["Salary"]);
var currentSalary = Convert.ToDecimal(
entry.CurrentValues["Salary"]);
if (originalSalary != currentSalary)
{
if (currentSalary > originalSalary * 1.1M)
throw new ApplicationException(
"Can't increase salary more than 10%");
}
}
return base.SaveChanges();
}
}