Data binding for listview in xamarin - xamarin

Question

I am trying to populate listview with database table in xamarin forms app
I am getting null pointer exception
Below is XAML for listview
<ListView x:Name="_listView"
ItemsSource="{Binding itemsInList}"
Grid.Column="0"
Grid.Row="0"
SelectedItem="{Binding SelectedItem}">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<StackLayout>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="1*"/>
</Grid.ColumnDefinitions>
<Label Text="{Binding Name}" Grid.Column="0" Grid.Row="0" />
</Grid>
</StackLayout>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
Below is xaml.cs(code behind)
public List <ServiceProvider> itemlist;
public List <ServiceProvider> itemsInList
{
get {return itemlist;}
}
protected override void OnAppearing()
{
base.OnAppearing();
ExpensesDatabase dbcon = new ExpensesDatabase(completePath);
itemlist = dbcon.GetItems(completePath);
// _listView.ItemsSource = itemlist;
}
Below is db file
public class ExpensesDatabase
{
readonly SQLiteConnection database;
public ExpensesDatabase(string dbPath)
{
database = new SQLiteConnection(dbPath);
database.CreateTable < ServiceProvider > ();
}
public List < ServiceProvider > GetItems(string dbPath)
{
return database.Table < ServiceProvider > ().ToList();
}
}
Data is not displayed in listview

Answer 1

If you want the ListView to automatically update as items are added, removed and changed in the underlying list, you'll need to use an ObservableCollection. ObservableCollection is defined in System.Collections.ObjectModel and is just like List, except that it can notify ListView of any changes:
public ObservableCollection<ServiceProvider> itemsInList { get; set; }
Then make sure you have set the right bindingContext and initialized the ObservableCollection:
public MainPage()
{
InitializeComponent();
itemsInList = new ObservableCollection<ServiceProvider>();
BindingContext = this;
}
I write a sample to test and it works on my side, you can have a look at the full code:
public partial class MainPage : ContentPage
{
public ObservableCollection<ServiceProvider> itemsInList { get; set; }
public MainPage()
{
InitializeComponent();
itemsInList = new ObservableCollection<ServiceProvider>();
BindingContext = this;
}
protected override void OnAppearing()
{
base.OnAppearing();
itemsInList.Add(new ServiceProvider() { Name= "a"});
}
}
public class ServiceProvider : INotifyPropertyChanged
{
string name;
public event PropertyChangedEventHandler PropertyChanged;
public ServiceProvider()
{
}
public String Name
{
set
{
if (name != value)
{
name = value;
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs("Name"));
}
}
}
get
{
return name;
}
}
}
Feel free to ask me any question if you still can't solve it.