CODEWITHSUNDEEP
c#listdatagridicollectionview
user572844
user572844

Reputation:

Convert ICollectionView to List<T>

I am binding property type of ICollectionView on DataGrid controls in WPF, .NET 4.0.

I use Filter on ICollectionView.

    public ICollectionView CallsView
    {
        get
        {
            return _callsView;
        }
        set
        {
            _callsView = value;
            NotifyOfPropertyChange(() => CallsView);
        }
    }

    private void FilterCalls()
    {
        if (CallsView != null)
        {
            CallsView.Filter = new Predicate<object>(FilterOut);
            CallsView.Refresh();
        }
    }

    private bool FilterOut(object item)
    {
       //..
    }

Init ICollection view:

IList<Call> source;
CallsView = CollectionViewSource.GetDefaultView(source);

I am trying to solve this problem:

For example source data count is 1000 items. I use filter, in DataGrid control I show only 200 items.

I would like convert ICollection current view to IList<Call>

Upvotes: 16

Views: 18875

Answers (4)

Steven Volckaert
Steven Volckaert

Reputation: 357

Because System.Component.ICollectionView doesn't implement IList, you can't just call ToList(). Like Niloo already answered, you first need to cast the items in the collection view.

You could use the following extension method:

/// <summary>
/// Casts a System.ComponentModel.ICollectionView of as a System.Collections.Generic.List&lt;T&gt; of the specified type.
/// </summary>
/// <typeparam name="TResult">The type to cast the elements of <paramref name="source"/> to.</typeparam>
/// <param name="source">The System.ComponentModel.ICollectionView that needs to be casted to a System.Collections.Generic.List&lt;T&gt; of the specified type.</param>
/// <returns>A System.Collections.Generic.List&lt;T&gt; that contains each element of the <paramref name="source"/>
/// sequence cast to the specified type.</returns>
/// <exception cref="ArgumentNullException"><paramref name="source"/> is <c>null</c>.</exception>
/// <exception cref="InvalidCastException">An element in the sequence cannot be cast to the type <typeparamref name="TResult"/>.</exception>
[SuppressMessage("Microsoft.Design", "CA1002:DoNotExposeGenericLists", Justification = "Method is provided for convenience.")]
public static List<TResult> AsList<TResult>(this ICollectionView source)
{
    return source.Cast<TResult>().ToList();
}

Usage:

var collectionViewList = MyCollectionViewSource.View.AsList<Call>();

Upvotes: 1

Niloo
Niloo

Reputation: 1215

You can try:

List<Call> CallsList = CallsView.Cast<Call>().ToList();

Upvotes: 28

mike gold
mike gold

Reputation: 1611

I just ran into this problem in Silverlight, but its the same in WPF:

IEnumerable<call> calls = collectionViewSource.View.Cast<call>();

Upvotes: 1

payo
payo

Reputation: 4561

Can you just use an extension method to convert:

IList<Call> source = collection.ToList();

Upvotes: 0

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