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https://github.com/oliverbooth/X10D
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Add IEnumerable<T?>.WhereNotNull()
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@ -22,6 +22,7 @@
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- X10D: Added `IEnumerable<T>.LastWhereNot(Func<T, bool>)`
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- X10D: Added `IEnumerable<T>.LastWhereNotOrDefault(Func<T, bool>)`
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- X10D: Added `IEnumerable<T>.WhereNot(Func<T, bool>)`
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- X10D: Added `IEnumerable<T>.WhereNotNull()`
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- X10D: Added `IList<T>.RemoveRange(Range)`
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- X10D: Added `IList<T>.Swap(IList<T>)` (#62)
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- X10D: Added `IReadOnlyList<T>.IndexOf(T[, int[, int]])`
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@ -287,6 +287,27 @@ public class EnumerableTests
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Assert.ThrowsException<ArgumentNullException>(() => ((IEnumerable<int>?)null)!.WhereNot(x => x % 2 == 0));
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}
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[TestMethod]
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public void WhereNotNull_ShouldContainNoNullElements()
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{
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object?[] array = Enumerable.Repeat(new object(), 10).ToArray();
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array[1] = null;
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array[2] = null;
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array[8] = null;
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array[9] = null;
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const int expectedCount = 6;
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var actualCount = 0;
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foreach (object o in array.WhereNotNull())
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{
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Assert.IsNotNull(o);
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actualCount++;
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}
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Assert.AreEqual(expectedCount, actualCount);
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}
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private class DummyClass
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{
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public int Value { get; set; }
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@ -1,4 +1,4 @@
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using System.Diagnostics.Contracts;
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using System.Diagnostics.Contracts;
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namespace X10D.Collections;
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@ -352,4 +352,28 @@ public static class EnumerableExtensions
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return source.Where(item => !predicate(item));
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}
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/// <summary>
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/// Filters a sequence of values by omitting elements that are <see langword="null" /> (<see langword="Nothing" /> in
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/// Visual Basic).
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/// </summary>
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/// <param name="source">An <see cref="IEnumerable{T}" /> to filter.</param>
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/// <typeparam name="TSource">The type of the elements of <paramref name="source" />.</typeparam>
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/// <returns>
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/// An <see cref="IEnumerable{T}" /> that contains elements from the input sequence that are not <see langword="null" />
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/// (<see langword="Nothing" /> in Visual Basic).
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/// </returns>
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public static IEnumerable<TSource> WhereNotNull<TSource>(this IEnumerable<TSource?> source)
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{
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#if NET6_0_OR_GREATER
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ArgumentNullException.ThrowIfNull(source);
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#else
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if (source is null)
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{
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throw new ArgumentNullException(nameof(source));
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}
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#endif
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return source.Where(item => item is not null).Select(item => item!);
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}
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}
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