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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
namespace System.Data.Entity
{
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Diagnostics.CodeAnalysis;
/// <summary>
/// Extends <see cref="ObservableCollection{T}" /> and adds an explicit implementation of <see cref="IListSource" />.
/// The GetList method of IListSource is implemented to return an <see cref="IBindingList" /> implementation that
/// stays in sync with the ObservableCollection.
/// This class can be used to implement navigation properties on entities for use in Windows Forms data binding.
/// For WPF data binding using an ObservableCollection rather than an instance of this class is recommended.
/// </summary>
/// <typeparam name="T"> </typeparam>
[SuppressMessage("Microsoft.Naming", "CA1710:IdentifiersShouldHaveCorrectSuffix",
Justification = "Adding Collection makes the name too long.")]
public class ObservableListSource<T> : ObservableCollection<T>, IListSource
where T : class
{
#region Fields and constructors
private IBindingList _bindingList;
/// <summary>
/// Initializes a new instance of the <see cref="ObservableListSource{T}" /> class.
/// </summary>
public ObservableListSource()
{
}
/// <summary>
/// Initializes a new instance of the <see cref="ObservableListSource{T}" /> class that
/// contains elements copied from the specified collection.
/// </summary>
/// <param name="collection"> The collection from which the elements are copied. </param>
public ObservableListSource(IEnumerable<T> collection)
: base(collection)
{
}
/// <summary>
/// Initializes a new instance of the <see cref="ObservableListSource{T}" /> class that
/// contains elements copied from the specified list.
/// </summary>
/// <param name="list"> The list from which the elements are copied. </param>
public ObservableListSource(List<T> list)
: base(list)
{
}
#endregion
#region IListSource implementation
/// <summary>
/// Returns <c>false</c>.
/// </summary>
/// <returns> <c>false</c> . </returns>
bool IListSource.ContainsListCollection
{
get { return false; }
}
/// <summary>
/// Returns an <see cref="IBindingList" /> implementation that stays in sync with this <see cref="ObservableCollection{T}" />.
/// The returned list is cached on this object such that the same list is returned each time this method is called.
/// </summary>
/// <returns> An <see cref="IBindingList" /> implementation that stays in sync with this <see
/// cref="ObservableCollection{T}" /> . </returns>
IList IListSource.GetList()
{
return _bindingList ?? (_bindingList = this.ToBindingList());
}
#endregion
}
}
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