private static void Method08()
{
Member member = new Member { Id = 1, Password = "******" + DateTime.Now.Second };
using (var db = new DataContext())
{
//先查询一次，让上下文中存在相同主键的对象
Member oldMember = db.Members.Single(m => m.Id == 1);
Console.WriteLine("更新前：{0}。", oldMember.AddDate);
try
{
DbEntityEntry<Member> entry = db.Entry(member);
entry.State = EntityState.Unchanged;
entry.Property("Password").IsModified = true;
}
catch (InvalidOperationException)
{
ObjectContext objectContext = ((IObjectContextAdapter)db).ObjectContext;
ObjectStateEntry objectEntry = objectContext.ObjectStateManager.GetObjectStateEntry(oldMember);
objectEntry.ApplyCurrentValues(member);
objectEntry.ChangeState(EntityState.Unchanged);
objectEntry.SetModifiedProperty("Password");
}
db.Configuration.ValidateOnSaveEnabled = false;
int count = db.SaveChanges();
db.Configuration.ValidateOnSaveEnabled = true;
Console.WriteLine("操作结果：{0}", count > 0 ? "更新成功。" : "未更新。");
Member newMember = db.Members.Single(m => m.Id == 1);
Console.WriteLine("更新后：{0}。", newMember.Password);
}
}
private static void Method09()
{
Member member = new Member { Id = 1, Password = "******" + DateTime.Now.Second };
using (var db = new DataContext())
{
//先查询一次，让上下文中存在相同主键的对象
Member oldMember = db.Members.Single(m => m.Id == 1);
Console.WriteLine("更新前：{0}。", oldMember.AddDate);
db.Update<Member>(m => new { m.Password }, member);
int count = db.SaveChanges(false);
Console.WriteLine("操作结果：{0}", count > 0 ? "更新成功。" : "未更新。");
Member newMember = db.Members.Single(m => m.Id == 1);
Console.WriteLine("更新后：{0}。", newMember.Password);
}
}
private static void Method06()
{
Member member = new Member { Id = 1, Password = "******" + DateTime.Now.Second };
using (var db = new DataContext())
{
DbEntityEntry<Member> entry = db.Entry(member);
entry.State = EntityState.Unchanged;
entry.Property("Password").IsModified = true;
db.Configuration.ValidateOnSaveEnabled = false;
int count = db.SaveChanges();
db.Configuration.ValidateOnSaveEnabled = true;
Console.WriteLine("操作结果：{0}", count > 0 ? "更新成功。" : "未更新。");
Member newMember = db.Members.Single(m => m.Id == 1);
Console.WriteLine("更新后：{0}。", newMember.Password);
}
}
