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OrderBy.cs
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OrderBy.cs
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namespace SuperLinq;
public static partial class SuperEnumerable
{
/// <summary>
/// Sorts the elements of a sequence in a particular direction (ascending, descending) according to a key
/// </summary>
/// <typeparam name="T">
/// The type of the elements in the source sequence
/// </typeparam>
/// <typeparam name="TKey">
/// The type of the key used to order elements
/// </typeparam>
/// <param name="source">
/// The sequence to order
/// </param>
/// <param name="keySelector">
/// A key selector function
/// </param>
/// <param name="direction">
/// A direction in which to order the elements (ascending, descending)
/// </param>
/// <returns>
/// An ordered copy of the source sequence
/// </returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="source"/> or <paramref name="keySelector"/> is <see langword="null"/>.
/// </exception>
/// <remarks>
/// <para>
/// This method is implemented by using deferred execution. However, <paramref name="source"/> will be consumed
/// in it's entirety immediately when first element of the returned sequence is consumed.
/// </para>
/// </remarks>
public static IOrderedEnumerable<T> OrderBy<T, TKey>(this IEnumerable<T> source, Func<T, TKey> keySelector, OrderByDirection direction)
{
return OrderBy(source, keySelector, comparer: null, direction);
}
/// <summary>
/// Sorts the elements of a sequence in a particular direction (ascending, descending) according to a key
/// </summary>
/// <typeparam name="T">
/// The type of the elements in the source sequence
/// </typeparam>
/// <typeparam name="TKey">
/// The type of the key used to order elements
/// </typeparam>
/// <param name="source">
/// The sequence to order
/// </param>
/// <param name="keySelector">
/// A key selector function
/// </param>
/// <param name="comparer">
/// An <see cref="IComparer{T}"/> to compare keys
/// </param>
/// <param name="direction">
/// A direction in which to order the elements (ascending, descending)
/// </param>
/// <returns>
/// An ordered copy of the source sequence
/// </returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="source"/> or <paramref name="keySelector"/> is <see langword="null"/>.
/// </exception>
/// <remarks>
/// <para>
/// This method is implemented by using deferred execution. However, <paramref name="source"/> will be consumed
/// in it's entirety immediately when first element of the returned sequence is consumed.
/// </para>
/// </remarks>
public static IOrderedEnumerable<T> OrderBy<T, TKey>(
this IEnumerable<T> source,
Func<T, TKey> keySelector,
IComparer<TKey>? comparer,
OrderByDirection direction
)
{
ArgumentNullException.ThrowIfNull(source);
ArgumentNullException.ThrowIfNull(keySelector);
return direction == OrderByDirection.Ascending
? source.OrderBy(keySelector, comparer)
: source.OrderByDescending(keySelector, comparer);
}
/// <summary>
/// Performs a subsequent ordering of elements of a sequence in a particular direction (ascending, descending) according to a key
/// </summary>
/// <typeparam name="T">
/// The type of the elements in the source sequence
/// </typeparam>
/// <typeparam name="TKey">
/// The type of the key used to order elements
/// </typeparam>
/// <param name="source">
/// The sequence to order
/// </param>
/// <param name="keySelector">
/// A key selector function
/// </param>
/// <param name="direction">
/// A direction in which to order the elements (ascending, descending)
/// </param>
/// <returns>
/// An ordered copy of the source sequence
/// </returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="source"/> or <paramref name="keySelector"/> is <see langword="null"/>.
/// </exception>
/// <remarks>
/// <para>
/// This method is implemented by using deferred execution. However, <paramref name="source"/> will be consumed
/// in it's entirety immediately when first element of the returned sequence is consumed.
/// </para>
/// </remarks>
public static IOrderedEnumerable<T> ThenBy<T, TKey>(
this IOrderedEnumerable<T> source,
Func<T, TKey> keySelector,
OrderByDirection direction
)
{
return ThenBy(source, keySelector, comparer: null, direction);
}
/// <summary>
/// Performs a subsequent ordering of elements of a sequence in a particular direction (ascending, descending) according to a key
/// </summary>
/// <typeparam name="T">
/// The type of the elements in the source sequence
/// </typeparam>
/// <typeparam name="TKey">
/// The type of the key used to order elements
/// </typeparam>
/// <param name="source">
/// The sequence to order
/// </param>
/// <param name="keySelector">
/// A key selector function
/// </param>
/// <param name="comparer">
/// An <see cref="IComparer{T}"/> to compare keys
/// </param>
/// <param name="direction">
/// A direction in which to order the elements (ascending, descending)
/// </param>
/// <returns>
/// An ordered copy of the source sequence
/// </returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="source"/> or <paramref name="keySelector"/> is <see langword="null"/>.
/// </exception>
/// <remarks>
/// <para>
/// This method is implemented by using deferred execution. However, <paramref name="source"/> will be consumed
/// in it's entirety immediately when first element of the returned sequence is consumed.
/// </para>
/// </remarks>
public static IOrderedEnumerable<T> ThenBy<T, TKey>(
this IOrderedEnumerable<T> source,
Func<T, TKey> keySelector,
IComparer<TKey>? comparer,
OrderByDirection direction
)
{
ArgumentNullException.ThrowIfNull(source);
ArgumentNullException.ThrowIfNull(keySelector);
return direction == OrderByDirection.Ascending
? source.ThenBy(keySelector, comparer)
: source.ThenByDescending(keySelector, comparer);
}
}