/// <summary>
/// This method demonstrates how to undo the changes in Property level using DbContext.
/// </summary>
public static void UndoChangesInProperty()
{
using (DbMySchool school = new DbMySchool())
{
DbCourse course = school.DbCourses.FirstOrDefault();
DbDepartment department = school.DbDepartments.FirstOrDefault();
if (course != null)
{
Console.WriteLine("Before changes:");
course.ShowDbCourse();
Console.WriteLine("After changes:");
// Change the course Properties.
course.Title += "-Modified";
course.Department = department;
course.ShowDbCourse();
Console.WriteLine("After Undo Course Entity's Title Property:");
// Undo the change in the Entity Property level. UndoDbEntityProperty
// method will undo the Title property of the course, but the change of the
// Department Property will not be undone.
school.UndoDbEntityProperty(course, "Title");
course.ShowDbCourse();
}
}
}
/// <summary>
/// This method demonstrates how to undo the changes in Context level using DbContext.
/// </summary>
public static void UndoChangesInContext()
{
using (DbMySchool school = new DbMySchool())
{
DbCourse course = school.DbCourses.FirstOrDefault();
if (course != null)
{
Console.WriteLine("Before changes:");
course.ShowDbCourse();
Console.WriteLine("After changes:");
// Change the course and the related department.
course.Title += "-Modified";
course.Department.Name += "-Modified";
course.ShowDbCourse();
Console.WriteLine("After Undo DbContext:");
// Undo the whole Context.
school.UndoDbContext();
course.ShowDbCourse();
}
}
}