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Next, the controller calls into the service layer to do the actual database
operation of saving the new to-do item:
var successful = await _todoItemService.AddItemAsync(newItem);
if (!successful)
{
return BadRequest(new { error = "Could not add item." });
}
The AddItemAsync method will return true or false depending on
whether the item was successfully added to the database. If it fails for
some reason, the action will return an HTTP 400 Bad Request error
along with an object that contains an error message.
Finally, if everything completed without errors, the action redirects the
browser to the /Todo/Index route, which refreshes the page and
displays the new, updated list of to-do items to the user.
Add a service method
66
Add new to-do items
If you're using a code editor that understands C#, you'll see red squiggely
lines under AddItemAsync because the method doesn't exist yet.
As a last step, you need to add a method to the service layer. First, add it
to the interface definition in ITodoItemService :
public interface ITodoItemService
{
Task<TodoItem[]> GetIncompleteItemsAsync();
Task<bool> AddItemAsync(TodoItem newItem);
}
Then, the actual implementation in TodoItemService :
public async Task<bool> AddItemAsync(TodoItem newItem)
{
newItem.Id = Guid.NewGuid();
newItem.IsDone = false;
newItem.DueAt = DateTimeOffset.Now.AddDays(3);
_context.Items.Add(newItem);
var saveResult = await _context.SaveChangesAsync();
return saveResult == 1;
}
The newItem.Title property has already been set by ASP.NET Core's
model binder, so this method only needs to assign an ID and set the
default values for the other properties. Then, the new item is added to
the database context. It isn't actually saved until you call
SaveChangesAsync() . If the save operation was successful,
SaveChangesAsync() will return 1.
Try it out
67
Add new to-do items
Run the application and add some items to your to-do list with the form.
Since the items are being stored in the database, they'll still be there
even after you stop and start the application again.
As an extra challenge, try adding a date picker using HTML and
JavaScript, and let the user choose an (optional) date for the