/// <summary>Returns the first element of the sequence that satisfies a condition or a default value if no such element is found.</summary>
/// <returns>default(<typeparamref name="TSource" />) if <paramref name="source" /> is empty or if no element passes the test specified by <paramref name="predicate" />; otherwise, the first element in <paramref name="source" /> that passes the test specified by <paramref name="predicate" />.</returns>
/// <param name="source">An <see cref="IBindableCollection{TElement}" /> to return an element from.</param>
/// <param name="predicate">A function to test each element for a condition.</param>
/// <typeparam name="TSource">The type of the elements of <paramref name="source" />.</typeparam>
/// <exception cref="T:System.ArgumentNullException">
/// <paramref name="source" /> or <paramref name="predicate" /> is null.</exception>
public static IBindable <TSource> First <TSource>(this IBindableCollection <TSource> source, Expression <Func <TSource, bool> > predicate) where TSource : class
{
return(source.FirstOrDefault(predicate));
}
/// <summary>Returns the first element of a sequence, or a default value if the sequence contains no elements.</summary>
/// <returns>default(<typeparamref name="TSource" />) if <paramref name="source" /> is empty; otherwise, the first element in <paramref name="source" />.</returns>
/// <param name="source">The <see cref="IBindableCollection{TElement}" /> to return the first element of.</param>
/// <typeparam name="TSource">The type of the elements of <paramref name="source" />.</typeparam>
/// <exception cref="T:System.ArgumentNullException">
/// <paramref name="source" /> is null.</exception>
public static IBindable <TSource> First <TSource>(this IBindableCollection <TSource> source)
{
return(source.FirstOrDefault());
}
