public async Task <IActionResult> OnPostAsync()
{
if (!ModelState.IsValid)
{
return(Page());
}
_context.Attach(Movie).State = EntityState.Modified;
try
{
await _context.SaveChangesAsync();
}
catch (DbUpdateConcurrencyException)
{
if (!MovieExists(Movie.ID))
{
return(NotFound());
}
else
{
throw;
}
}
return(RedirectToPage("./Index"));
}
public async Task <IActionResult> OnPostAsync()
{
if (!ModelState.IsValid)
{
return(Page());
}
_context.Attach(Movie).State = EntityState.Modified;
try
{
await _context.SaveChangesAsync();
}
//this handles if a movie has been deleted by one client while being edited by another
catch (DbUpdateConcurrencyException)
{
if (!MovieExists(Movie.ID))
{
return(NotFound());
}
else
{
throw;
}
}
//if no errors, return to the list
return(RedirectToPage("./Index"));
}
public async Task <IActionResult> OnPostAsync()
{
if (!ModelState.IsValid)
{
return(Page());
}
_context.Attach(Movie).State = EntityState.Modified;
try
{
await _context.SaveChangesAsync();
}
catch (DbUpdateConcurrencyException)
{
// 处理并发异常，一个用户编辑了电影，另一个用户立即删除电影，则前一个用户保存时会出现并发问题。
if (!MovieExists(Movie.ID))
{
return(NotFound());
}
else
{
throw;
}
}
// 注意区别./Index 和 Index 是当前路径下的Index页面，/Index是根目录Pages下面的Index页面
return(RedirectToPage("./Index"));
}
public async Task <IActionResult> OnPostAsync()
{
// Use LINQ to get list of genres.
IQueryable <string> genreQuery = from m in _context.MyMovie
orderby m.Genre
select m.Genre;
var movies = from m in _context.MyMovie
select m;
if (!ModelState.IsValid)
{
return(Page());
}
_context.Attach(MyMovie).State = EntityState.Modified;
try
{
await _context.SaveChangesAsync();
}
catch (DbUpdateConcurrencyException)
{
if (!MyMovieExists(MyMovie.MyMovieID))
{
return(NotFound());
}
else
{
throw;
}
}
return(RedirectToPage("./Index"));
}