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can two collection in wpf have same objects

Innocent Ibex answered on March 17, 2022 Popularity 1/10 Helpfulness 1/10

answer can two collection in wpf have same objects

can two collection in wpf have same objects

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using System;
using System.Collections.ObjectModel;
using System.Collections.Specialized;
using System.Linq;
using System.Windows.Input;

namespace WpfApplication1
{
public class ViewModel
{
    private readonly ObservableCollection<Item> _clone;

    private readonly ObservableCollection<Item> _source;

    private readonly Collection<Item> _changes = new Collection<Item>();

    public ViewModel(ObservableCollection<Item> items)
    {
        _source = items;            
        _clone = new ObservableCollection<Item>(items);
        _clone.CollectionChanged += clone_CollectionChanged;
    }

    void clone_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
    {
        switch (e.Action)
        {
            case NotifyCollectionChangedAction.Add:
                foreach (var newItem in e.NewItems.Cast<Item>())
                {
                    _changes.Add(newItem);
                }
                break;
        }
    }

    public ObservableCollection<Item> Clone
    {
        get { return _clone; }
    }

    private DelegateCommand _commitChangesCommand;

    public ICommand CommitChangesCommand
    {
        get { return _commitChangesCommand ?? (_commitChangesCommand = new DelegateCommand(CommitChanges, CanCommitChanges)); }
    }

    private void CommitChanges(object sender)
    {
        foreach (var change in _changes)
        {
            _source.Add(change);
        }

        _changes.Clear();
    }

    private bool CanCommitChanges(object sender)
    {
        return _changes.Any();
    }
}

public class Item
{
}

public class DelegateCommand : ICommand
{
    private readonly Predicate<object> _canExecute;
    private readonly Action<object> _execute;

    public event EventHandler CanExecuteChanged;

    public DelegateCommand(Action<object> execute)
        : this(execute, null)
    {
    }

    public DelegateCommand(Action<object> execute,
        Predicate<object> canExecute)
    {
        _execute = execute;
        _canExecute = canExecute;
    }

    public bool CanExecute(object parameter)
    {
        return _canExecute == null || _canExecute(parameter);
    }

    public void Execute(object parameter)
    {
        _execute(parameter);
    }

    public void RaiseCanExecuteChanged()
    {
        if (CanExecuteChanged != null)
        {
            CanExecuteChanged(this, EventArgs.Empty);
        }
    }
}
}

Popularity 1/10 Helpfulness 1/10 Language whatever

Source: stackoverflow.com

Tags: whatever wpf

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Contributed on Mar 17 2022

Innocent Ibex

0 Answers Avg Quality 2/10

can two collection in wpf have same objects

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