Items in a file are being read in a weird order on Xamarin iOS - file-io

Question

I am reading a list of files in a folder in my Xamarin app and displaying them in a ListView. On Android, the files are created and read in the correct order, but on iOS, they are created in the right order, but read and displayed in a weird order and in the exact same weird order every time. I know it's not a problem with the ListView because I was using Syncfusion's SfListView recently and had the same problem with that. Why is it like this?
The correct order of the files:
What they look like on iOS:
My code to create the files:
using Partylist.Models;
using System;
using System.IO;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;
namespace Partylist.Views
{
[XamlCompilation(XamlCompilationOptions.Compile)]
public partial class NewEventPage : ContentPage
{
...
// Event handler for when the "Create" button gets clicked.
async void OnCreateClicked(object sender, EventArgs e)
{
// Make sure there is something in the text entry.
if (string.IsNullOrWhiteSpace(EventNameEntry.Text))
{
// If there is nothing there, display an error message.
await DisplayAlert("Oops!", "Your event needs a name!",
"OK");
}
// If there is something in the text entry, try to create
// a new event with the text as its name.
else
{
// Variable to store the created event.
Event newEvent = new Event();
// Variable to store its folder.
DirectoryInfo newEventFolder;
// Flag to see if the event was created sccessfully.
bool eventCreated;
try
{
// If there's already an event with that name, let the
// user know.
if (Directory.Exists(Path.Combine(App.eventFolderPath,
EventNameEntry.Text)))
{
await DisplayAlert("Oops!", "You already have an event with that name.", "Ok");
eventCreated = false;
}
// Otherwise, try to create the folder.
else
{
newEventFolder = Directory.CreateDirectory(
Path.Combine(App.eventFolderPath,
EventNameEntry.Text));
// Then, create the event based on that folder.
newEvent = new Event
{
EventFolder = newEventFolder,
Location = WhereEntry.Text,
EventDate = EventDatePicker.Date,
StartTime = EventStartTimePicker.Time,
EndTime = EventEndTimePicker.Time,
Refreshments = RefreshmentsEntry.Text,
Activities = ActivitiesEntry.Text,
NumGuests = NumGuestsEntry.Text,
Theme = ThemeEntry.Text,
Budget = BudgetEntry.Text,
WillThereBePartyFavors = PartyFavorsEntry.Text,
ShouldGuestsBringGifts = GiftsEntry.Text,
WillThereBeChildren = ChildrenEntry.Text
};
// --- Add several premade lists to the event (all of --- //
// --- which are empty except the main checklist) --- //
// First, the main checklist. Also, set it as such.
using (FileStream fs = File.Create(Path.Combine(App
.eventFolderPath, EventNameEntry.Text,
"Main Checklist.mchec"))) { }
// Then, a contact list for important phone numbers.
using (FileStream fs = File.Create(Path.Combine(App
.eventFolderPath, EventNameEntry.Text,
"Important Phone Numbers.cont"))) { }
// And another contact list for guests.
using (FileStream fs = File.Create(Path.Combine(App
.eventFolderPath, EventNameEntry.Text,
"Guests.cont"))) { }
// The next thing we need is a schedule of activities.
using (FileStream fs = File.Create(Path.Combine(App
.eventFolderPath, EventNameEntry.Text,
"Schedule of Activities.sched"))) { }
// After that, a checklist for things to do.
using (FileStream fs = File.Create(Path.Combine(App
.eventFolderPath, EventNameEntry.Text,
"Things to Do.chec"))) { }
// And one for things to gather.
using (FileStream fs = File.Create(Path.Combine(App
.eventFolderPath, EventNameEntry.Text,
"Things to Gather.chec"))) { }
// And one for things to buy.
using (FileStream fs = File.Create(Path.Combine(App
.eventFolderPath, EventNameEntry.Text,
"Things to Buy.chec"))) { }
// And one for things to make.
using (FileStream fs = File.Create(Path.Combine(App
.eventFolderPath, EventNameEntry.Text,
"Things to Make.chec"))) { }
// And one that serves as a grocery list.
using (FileStream fs = File.Create(Path.Combine(App
.eventFolderPath, EventNameEntry.Text,
"Groceries.chec"))) { }
// There will also be one for things to do the day before the event.
using (FileStream fs = File.Create(Path.Combine(App
.eventFolderPath, EventNameEntry.Text,
"The Day Before.chec"))) { }
// And one for things to do the day of.
using (FileStream fs = File.Create(Path.Combine(App
.eventFolderPath, EventNameEntry.Text,
"The Day Of.chec"))) { }
// --- End of adding pre-made lists --- //
// Let the program know that an event has been created.
eventCreated = true;
}
}
// Should throw an ArgumentException in most cases where there is
// an invalid character.
catch (ArgumentException)
{
// Get all the invalid characters and turn them into a string.
char[] invalidChars = Path.GetInvalidPathChars();
string invalid = "";
foreach(char currentChar in invalidChars)
{
invalid += currentChar;
}
// Display an error message.
await DisplayAlert("Oops!", "Your event name can't have these characters: \""
+ invalid + "\".", "Ok");
eventCreated = false;
}
// If the event was created successfully, start the tip
// timer, select the event, open a "List" page
// for it, and removed the "New Event" page.
if (eventCreated)
{
App.tipTimer.Start();
App.selectedEvent = newEvent;
await Navigation.PushAsync(new ListsPage());
Navigation.RemovePage(this);
}
}
}
}
}
And my code to read in the files:
using Partylist.Models;
using System;
using System.Collections.ObjectModel;
using System.IO;
using System.Linq;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;
namespace Partylist.Views
{
[XamlCompilation(XamlCompilationOptions.Compile)]
public partial class ListsPage : ContentPage
{
// List of lists, used to populate
// the page's ListView (see the XAML).
public ObservableCollection<PartylistList> ListList { get; set; }
...
// Override for OnAppearing().
protected override void OnAppearing()
{
// Regular OnAppearing() method.
base.OnAppearing();
// Set the title to be the name of the selected event.
Title = App.selectedEvent.EventFolder.Name;
// Set the BindingContext of the page to itself.
BindingContext = this;
// Update the ListView.
UpdateListView();
...
}
// Function to update the ListView when the page loads or when something changes.
private void UpdateListView()
{
// Set the list of lists to a new ObservableCollection
// that we can add stuff to.
ListList = new ObservableCollection<PartylistList>();
// Loop to populate the ObservableCollection.
for (int i = 0; i < Directory.GetFiles(
Path.Combine(App.eventFolderPath,
App.selectedEvent.EventFolder.Name))
.Length; i++)
{
// If the current file is the main checklist (filename ends with ".mchec"),
// then add it to the list of lists as the main checklist.
if (Directory.GetFiles(Path.Combine(App.eventFolderPath,
App.selectedEvent.EventFolder.Name))[i].EndsWith(".mchec"))
{
ListList.Add(new PartylistList(new FileInfo(Path.GetFullPath(
Directory.GetFiles(Path.Combine(App.eventFolderPath,
App.selectedEvent.EventFolder.Name))[i])), new ChecklistPage(),
"#FF7700", "master_checklist_icon.png"));
// Set a "Rename" button as this thing's only SwipeItem.
ListList.ElementAt(i).SwipeOptions.Add(new SwipeItem()
{
Text = "Rename",
BackgroundColor = Color.FromHex("#ff7700"),
CommandParameter = ListList.ElementAt(i)
});
ListList.ElementAt(i).SwipeOptions[0].Invoked += OnRename;
// Set this as the event's main checklist.
App.selectedEvent.MainChecklist = new FileInfo(Path.GetFullPath(
Directory.GetFiles(Path.Combine(App.eventFolderPath, App
.selectedEvent.EventFolder.Name))[i]));
}
// If the current file is a contact list (filename ends with ".cont"),
// then add it to the list of lists as a contact list.
else if (Directory.GetFiles(Path.Combine(App.eventFolderPath,
App.selectedEvent.EventFolder.Name))[i].EndsWith(".cont"))
{
ListList.Add(new PartylistList(new FileInfo(Path.GetFullPath(
Directory.GetFiles(Path.Combine(App.eventFolderPath,
App.selectedEvent.EventFolder.Name))[i])), new ContactsListPage(),
"#00DFDF", "contact_list_icon.png"));
// Set a "Delete" button as the first SwipeItem.
ListList.ElementAt(i).SwipeOptions.Add(new SwipeItem()
{
Text = "Delete",
BackgroundColor = Color.FromHex("#ff418b"),
CommandParameter = ListList.ElementAt(i)
});
ListList.ElementAt(i).SwipeOptions[0].Invoked += OnDelete;
// Set a "Rename" button as the second SwipeItem.
ListList.ElementAt(i).SwipeOptions.Add(new SwipeItem()
{
Text = "Rename",
BackgroundColor = Color.FromHex("#ff7700"),
CommandParameter = ListList.ElementAt(i)
});
ListList.ElementAt(i).SwipeOptions[1].Invoked += OnRename;
}
// Else if it is a schedule (filename ends with ".sched"), then
// add it to the list of lists as a schedule.
else if (Directory.GetFiles(Path.Combine(App.eventFolderPath,
App.selectedEvent.EventFolder.Name))[i].EndsWith(".sched"))
{
ListList.Add(new PartylistList(new FileInfo(Path.GetFullPath(
Directory.GetFiles(Path.Combine(App.eventFolderPath,
App.selectedEvent.EventFolder.Name))[i])), new SchedulePage(),
"#BB0099", "schedule_icon.png"));
// Set a "Delete" button as the first SwipeItem.
ListList.ElementAt(i).SwipeOptions.Add(new SwipeItem()
{
Text = "Delete",
BackgroundColor = Color.FromHex("#ff418b"),
CommandParameter = ListList.ElementAt(i)
});
ListList.ElementAt(i).SwipeOptions[0].Invoked += OnDelete;
// Set a "Rename" button as the second SwipeItem.
ListList.ElementAt(i).SwipeOptions.Add(new SwipeItem()
{
Text = "Rename",
BackgroundColor = Color.FromHex("#ff7700"),
CommandParameter = ListList.ElementAt(i)
});
ListList.ElementAt(i).SwipeOptions[1].Invoked += OnRename;
}
// Else if it is a checklist (filename ends with ".chec"), then
// add it to the list of lists as a checklist.
else if (Directory.GetFiles(Path.Combine(App.eventFolderPath,
App.selectedEvent.EventFolder.Name))[i].EndsWith(".chec"))
{
ListList.Add(new PartylistList(new FileInfo(Path.GetFullPath(
Directory.GetFiles(Path.Combine(App.eventFolderPath,
App.selectedEvent.EventFolder.Name))[i])), new ChecklistPage(),
"#3F7FFF", "checklist_icon.png"));
// Set a "Delete" button as the first SwipeItem.
ListList.ElementAt(i).SwipeOptions.Add(new SwipeItem()
{
Text = "Delete",
BackgroundColor = Color.FromHex("#ff418b"),
CommandParameter = ListList.ElementAt(i)
});
ListList.ElementAt(i).SwipeOptions[0].Invoked += OnDelete;
// Set a "Rename" button as the second SwipeItem.
ListList.ElementAt(i).SwipeOptions.Add(new SwipeItem()
{
Text = "Rename",
BackgroundColor = Color.FromHex("#ff7700"),
CommandParameter = ListList.ElementAt(i)
});
ListList.ElementAt(i).SwipeOptions[1].Invoked += OnRename;
}
// Set the ItemsSource of the ListView in the XAML to the ObservableCollection.
ListListView.ItemsSource = ListList;
// Calls OnPropertyChanged() which makes the ListView update.
OnPropertyChanged("ListList");
}
}
...
}
}