public async Task <IActionResult> Edit(int id, [Bind("ListingId,Name,StartingBidAmount,AuctionStartTime,AuctionEndTime,Description,ListingImage")] AuctionItemModel auctionItemModel)
{
if (id != auctionItemModel.ListingId)
{
return(NotFound());
}
if (ModelState.IsValid)
{
try
{
_context.Update(auctionItemModel);
await _context.SaveChangesAsync();
}
catch (DbUpdateConcurrencyException)
{
if (!AuctionItemModelExists(auctionItemModel.ListingId))
{
return(NotFound());
}
else
{
throw;
}
}
return(RedirectToAction(nameof(Index)));
}
return(View(auctionItemModel));
}
public async Task <IActionResult> Edit(int id, [Bind("Title,ReleaseDate,Genre,Price,Rating,ID")] Movie movie)
{
if (id != movie.ID)
{
return(NotFound());
}
if (ModelState.IsValid)
{
try
{
_context.Update(movie);
await _context.SaveChangesAsync();
}
catch (DbUpdateConcurrencyException)
{
if (!MovieExists(movie.ID))
{
return(NotFound());
}
else
{
throw;
}
}
return(RedirectToAction(nameof(Index)));
}
return(View(movie));
}
public async Task <IActionResult> Edit(int id, [Bind("AvatarImage,Name,Email,MobilePhone,Status,ID")] ApplicationUser applicationUser)
{
if (id != applicationUser.ID)
{
return(NotFound());
}
if (ModelState.IsValid)
{
try
{
_context.Update(applicationUser);
await _context.SaveChangesAsync();
}
catch (DbUpdateConcurrencyException)
{
if (!ApplicationUserExists(applicationUser.ID))
{
return(NotFound());
}
else
{
throw;
}
}
return(RedirectToAction(nameof(Index)));
}
return(View(applicationUser));
}
public static void Update()
{
context.Update <User>(a => a.Id == 1, a => new User()
{
Name = a.Name, Age = a.Age + 1, Gender = Gender.Man, OpTime = DateTime.Now
});
/*
*
*/
//批量更新
//给所有女性年轻 1 岁
context.Update <User>(a => a.Gender == Gender.Woman, a => new User()
{
Age = a.Age - 1, OpTime = DateTime.Now
});
/*
*
*/
User user = new User();
user.Id = 1;
user.Name = "lu";
user.Age = 28;
user.Gender = Gender.Man;
user.OpTime = DateTime.Now;
context.Update(user); //会更新所有映射的字段
/*
*
*/
/*
* 支持只更新属性值已变的属性
*/
context.TrackEntity(user); //在上下文中跟踪实体
user.Name = user.Name + "1";
context.Update(user); //这时只会更新被修改的字段
/*
*
*/
ConsoleHelper.WriteLineAndReadKey();
}