async Task ExecuteLoadItemsCommand()
{
if (IsBusy)
{
return;
}
IsBusy = true;
try
{
Notes.Clear();
var notes = await PluralsightDataStore.GetNotesAsync();
foreach (var note in notes)
{
Notes.Add(note);
}
}
catch (Exception ex)
{
Debug.WriteLine(ex);
}
finally
{
IsBusy = false;
}
}
async Task ExecuteLoadItemsCommand()
{
if (IsBusy)
{
return;
}
IsBusy = true;
try
{
Notes.Clear();
// this gets complicated
// PluralSightDataStore is a (member ...property? )
// created in BaseViewModel via DependencyService
// it is of type IPluralSightDataStore
var notes = await PluralsightDataStore.GetNotesAsync();
foreach (var note in notes)
{
Notes.Add(note);
}
}
catch (Exception ex)
{
Debug.WriteLine(ex);
}
finally
{
IsBusy = false;
}
}
public ItemsViewModel()
{
Title = "Browse";
Notes = new ObservableCollection <Note>();
LoadItemsCommand = new Command(async() => await ExecuteLoadItemsCommand());
// Handle "SaveNote" message
MessagingCenter.Subscribe <ItemDetailPage, Note>(this, "SaveNote",
async(sender, note) => {
// Add note to collection - will automatically refresh data binding
Notes.Add(note);
// Add to data store
await PluralsightDataStore.AddNoteAsync(note);
});
// Handle "UpdateNote" message
MessagingCenter.Subscribe <ItemDetailPage, Note>(this, "UpdateNote",
async(sender, note) => {
// Update note in data store
await PluralsightDataStore.UpdateNoteAsync(note);
// Modifying a member (our note) within an ObservableCollection
// does not automatically refresh data binding .. so explicitly
// repopulate the collection
await ExecuteLoadItemsCommand();
});
/*
* MessagingCenter.Subscribe<NewItemPage, Item>(this, "AddItem", async (obj, item) =>
* {
* var newItem = item as Item;
* Items.Add(newItem);
* await DataStore.AddItemAsync(newItem);
* });
*/
}
public ItemsViewModel()
{
Title = "Browse";
Notes = new ObservableCollection <Note>();
LoadItemsCommand = new Command(async() => await ExecuteLoadItemsCommand());
MessagingCenter.Subscribe <ItemDetailPage, Note>(this, "SaveNote",
async(sender, note) => {
Notes.Add(note);
await PluralsightDataStore.AddNoteAsync(note);
});
}
public ItemsViewModel()
{
Title = "Browse";
Notes = new ObservableCollection <Note>();
LoadItemsCommand = new Command(async() => await ExecuteLoadItemsCommand());
//step 7 subscribe to message
// he throws in an lambda with two outs in the bottome of the 9th
MessagingCenter.Subscribe <ItemDetailPage, Note>(this, "SaveNote",
async(sender, note) => {
Notes.Add(note);
await PluralsightDataStore.AddNoteAsync(note);
});
}
public ItemsViewModel()
{
Title = "Browse";
Notes = new ObservableCollection <Note>();
LoadItemsCommand = new Command(async() => await ExecuteLoadItemsCommand());
MessagingCenter.Subscribe <ItemDetailPage, Note>(this, "SaveNote", async(sender, note) =>
{
var newNote = note as Note;
Notes.Add(newNote);
await PluralsightDataStore.AddNoteAsync(newNote);
});
MessagingCenter.Subscribe <ItemDetailPage, Note>(this, "UpdateNote",
async(sender, note) => {
// Update note in data store
await PluralsightDataStore.UpdateNoteAsync(note);
// Modifying a member (our note) within an ObservableCollection
// does not automatically refresh data binding .. so explicitly
// repopulate the collection
await ExecuteLoadItemsCommand();
});
}
async void InitializedCourseList()
{
CourseList = await PluralsightDataStore.GetCoursesAsync();
}
async void InitializeCourselist()
{
CourseList = await PluralsightDataStore.GetCoursesAsync();
MealList = await PluralsightDataStore.GetMealingsAsync();
}