private static void RemoveRecord()
{
// Find a car to delete by primary key.
using (AutoLotEntities context = new AutoLotEntities())
{
// Define a key for the entity we are looking for.
EntityKey key = new EntityKey("AutoLotEntities.Cars", "CarID", 2222);
// See if we have it.
Car carToDelete = (Car)context.GetObjectByKey(key);
if (carToDelete != null)
{
context.DeleteObject(carToDelete);
context.SaveChanges();
}
}
}
private static void UpdateRecord()
{
// Find a car to delete by primary key.
using (AutoLotEntities context = new AutoLotEntities())
{
// Define a key for the entity we are looking for.
EntityKey key = new EntityKey("AutoLotEntities.Cars", "CarID", 2222);
// Grab the car, change it, save!
Car carToUpdate = (Car)context.GetObjectByKey(key);
if (carToUpdate != null)
{
carToUpdate.Color = "Blue";
context.SaveChanges();
}
}
}
private static void UpdateRecord()
{
// 通过主键查找要更新的汽车
using (AutoLotEntities context = new AutoLotEntities())
{
// 为查找的实体定义主键
EntityKey key = new EntityKey("AutoLotEntities.Cars", "CarID", 2222);
// 查找实体,如果存在的话将其删除
Car carToUpdate = (Car)context.GetObjectByKey(key);
if (carToUpdate != null)
{
carToUpdate.Color = "Blue";
context.SaveChanges();
}
}
}
private static void UpdateRecord()
{
// Find a car to delete by primary key.
using (AutoLotEntities context = new AutoLotEntities())
{
// Define a key for the entity we are looking for.
EntityKey key = new EntityKey("AutoLotEntities.Cars", "CarID", 2222);
// Grab the car, change it, save!
Car carToUpdate = (Car)context.GetObjectByKey(key);
Console.WriteLine(carToUpdate.EntityState);
if (carToUpdate != null)
{
carToUpdate.Color = "Blue";
context.SaveChanges();
}
}
}
private static void RemoveRecord()
{
// Find a car to delete by primary key.
using (AutoLotEntities context = new AutoLotEntities())
{
// Define a key for the entity we are looking for.
EntityKey key = new EntityKey("AutoLotEntities.Cars", "CarID", 2222);
// See if we have it.
Car carToDelete = (Car)context.GetObjectByKey(key);
if (carToDelete != null)
{
context.DeleteObject(carToDelete);
context.SaveChanges();
}
}
}
