MintPlayer.ObservableCollection 10.0.1

MintPlayer.ObservableCollection

Extended version of System.Collections.ObjectModel.ObservableCollection. This class allows you to:

1. Use AddRange, invoking the CollectionChanged event only once
2. Monitor properties of the items in the collection
3. Be used within a WPF project
4. Change the ObservableCollection from another Thread

Version info

License	Build status

Package	Release	Preview	Downloads
MintPlayer.ObservableCollection

Installation

NuGet package manager

Open the NuGet package manager and install the MintPlayer.ObservableCollection package in the project

Package manager console

Install-Package MintPlayer.ObservableCollection

WPF support

Xamarin.Forms is by default able to deal with Range Operations. WPF however (both .NET Framework and .NET Core) is unable to deal with Range Operations. This ObservableCollection does in fact support range operations (AddRange, RemoveRange) for WPF too.

A working example can be found in the following repository

Usage

Example 1

var collection = new ObservableCollection<string>();
collection.CollectionChanged += (sender, e) =>
{
    Console.WriteLine($"Collection changed:");
    if (!e.NewItems.IsNullOrEmpty())
    {
        var newItemsArray = new string[e.NewItems.Count];
        e.NewItems.CopyTo(newItemsArray, 0);
        Console.WriteLine($"- items added: {string.Join(", ", newItemsArray)}");
    }
    if (!e.OldItems.IsNullOrEmpty())
    {
        var oldItemsArray = new string[e.OldItems.Count];
        e.OldItems.CopyTo(oldItemsArray, 0);
        Console.WriteLine($"- items removed: {string.Join(", ", oldItemsArray)}");
    }
};

collection.Add("Michael");
//collection.Enabled = false;
collection.Add("Junior");
//collection.Enabled = true;
collection.Add("Jackson");

Example 2

public class Person : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;
    protected void OnPropertyChanged([CallerMemberName] string propertyName = "")
    {
        if (PropertyChanged != null)
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
    }

    private string firstname;
    public string FirstName
    {
        get { return firstname; }
        set
        {
            firstname = value;
            OnPropertyChanged();
        }
    }

    private string lastname;
    public string LastName
    {
        get { return lastname; }
        set
        {
            lastname = value;
            OnPropertyChanged();
        }
    }

    public string FullName => $"{firstname} {lastname}";
}

Program.cs

var collection = new ObservableCollection<Person>();
collection.CollectionChanged += (sender, e) =>
{
    Console.WriteLine($"Collection changed:");
    if (!e.NewItems.IsNullOrEmpty())
    {
        var newItemsArray = new Person[e.NewItems.Count];
        e.NewItems.CopyTo(newItemsArray, 0);
        Console.WriteLine($"- items added: {string.Join(", ", newItemsArray.Select(p => p.FullName))}");
    }
    if (!e.OldItems.IsNullOrEmpty())
    {
        var oldItemsArray = new Person[e.OldItems.Count];
        e.OldItems.CopyTo(oldItemsArray, 0);
        Console.WriteLine($"- items removed: {string.Join(", ", oldItemsArray.Select(p => p.FullName))}");
    }
};
collection.ItemPropertyChanged += (sender, e) =>
{
    Console.WriteLine($"Item property changed: {e.PropertyName}");
};

collection.AddRange(new[] {
    new Person { FirstName = "John", LastName = "Doe" },
    new Person { FirstName = "Jimmy", LastName = "Fallon" },
    new Person { FirstName = "Michael", LastName = "Douglas" }
});

collection[1].LastName = "Knibble";