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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,33 @@ | ||
| // <auto-generated /> | ||
| #if NET46X || NET47 | ||
| #pragma warning disable | ||
|
|
||
| namespace Polyfills; | ||
| using System.Collections; | ||
| using System.Collections.Generic; | ||
| using Link = System.ComponentModel.DescriptionAttribute; | ||
| using System.Linq; | ||
|
|
||
| static partial class Polyfill | ||
| { | ||
| /// <summary> | ||
| /// Appends a value to the end of the sequence. | ||
| /// </summary> | ||
| /// <param name="source">A sequence of values.</param> | ||
| /// <param name="element">The value to append to <paramref name="target" />.</param> | ||
| /// <typeparam name="TSource">The type of the elements of source.</typeparam> | ||
| /// <returns>A new sequence that ends with element.</returns> | ||
| [Link("https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.append")] | ||
| public static IEnumerable<TSource> Append<TSource>( | ||
| this IEnumerable<TSource> target, | ||
| TSource element) | ||
| { | ||
| foreach (var item in target) | ||
| { | ||
| yield return item; | ||
| } | ||
|
|
||
| yield return element; | ||
| } | ||
| } | ||
| #endif |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,28 @@ | ||
| // <auto-generated /> | ||
| #if NETFRAMEWORK || NETSTANDARD2_0 | ||
| #pragma warning disable | ||
|
|
||
| namespace Polyfills; | ||
| using System.Collections; | ||
| using System.Collections.Generic; | ||
| using Link = System.ComponentModel.DescriptionAttribute; | ||
| using System.Linq; | ||
|
|
||
| static partial class Polyfill | ||
| { | ||
| /// <summary> | ||
| /// Returns a new enumerable collection that contains the elements from source with the last count elements of the | ||
| /// source collection omitted. | ||
| /// </summary> | ||
| /// <param name="source">An enumerable collection instance.</param> | ||
| /// <param name="count">The number of elements to omit from the end of the collection.</param> | ||
| /// <typeparam name="TSource">The type of the elements in the enumerable collection.</typeparam> | ||
| /// <returns>A new enumerable collection that contains the elements from source minus count elements from the end | ||
| /// of the collection.</returns> | ||
| [Link("https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.skiplast")] | ||
| public static IEnumerable<TSource> SkipLast<TSource>( | ||
| this IEnumerable<TSource> target, | ||
| int count) => | ||
| target.Reverse().Skip(count).Reverse(); | ||
| } | ||
| #endif |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,28 @@ | ||
| // <auto-generated /> | ||
|
|
||
| #if NET471 || NET46X || NETSTANDARD2_0 | ||
| #pragma warning disable | ||
|
|
||
| namespace Polyfills; | ||
| using System.Collections; | ||
| using System.Collections.Generic; | ||
| using Link = System.ComponentModel.DescriptionAttribute; | ||
| using System.Linq; | ||
|
|
||
| static partial class Polyfill | ||
| { | ||
| /// <summary> | ||
| /// Creates a HashSet<T> from an IEnumerable<T> using the comparer to compare keys. | ||
| /// </summary> | ||
| /// <param name="source">An IEnumerable<T> to create a HashSet<T> from.</param> | ||
| /// <param name="comparer">An IEqualityComparer<T> to compare keys.</param> | ||
| /// <typeparam name="TSource">The type of the elements of source.</typeparam> | ||
| /// <returns>A HashSet<T> that contains values of type TSource selected from the input sequence.</returns> | ||
| [Link("https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.tohashset#system-linq-enumerable-tohashset-1(system-collections-generic-ienumerable((-0))-system-collections-generic-iequalitycomparer((-0)))")] | ||
| public static HashSet<TSource> ToHashSet<TSource>( | ||
| this IEnumerable<TSource> target, | ||
| IEqualityComparer<TSource>? comparer = null) => | ||
| new HashSet<TSource>(target, comparer); | ||
|
|
||
| } | ||
| #endif |
52 changes: 52 additions & 0 deletions
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src/Polyfill/Polyfill_IEnumerable_TryGetNonEnumeratedCount.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,52 @@ | ||
| // <auto-generated /> | ||
| #if !NET6_0_OR_GREATER | ||
| #pragma warning disable | ||
|
|
||
| namespace Polyfills; | ||
| using System.Collections; | ||
| using System.Collections.Generic; | ||
| using Link = System.ComponentModel.DescriptionAttribute; | ||
| using System.Linq; | ||
|
|
||
| static partial class Polyfill | ||
| { | ||
| /// <summary> | ||
| /// Attempts to determine the number of elements in a sequence without forcing an enumeration. | ||
| /// </summary> | ||
| /// <typeparam name="TSource">The type of the elements of <paramref name="source" />.</typeparam> | ||
| /// <param name="source">A sequence that contains elements to be counted.</param> | ||
| /// <param name="count"> | ||
| /// When this method returns, contains the count of <paramref name="source" /> if successful, | ||
| /// or zero if the method failed to determine the count.</param> | ||
| /// <returns> | ||
| /// <see langword="true" /> if the count of <paramref name="source"/> can be determined without enumeration; | ||
| /// otherwise, <see langword="false" />. | ||
| /// </returns> | ||
| /// <remarks> | ||
| /// The method performs a series of type tests, identifying common subtypes whose | ||
| /// count can be determined without enumerating; this includes <see cref="ICollection{T}"/>, | ||
| /// <see cref="ICollection"/> as well as internal types used in the LINQ implementation. | ||
| /// | ||
| /// The method is typically a constant-time operation, but ultimately this depends on the complexity | ||
| /// characteristics of the underlying collection implementation. | ||
| /// </remarks> | ||
| [Link("https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.trygetnonenumeratedcount")] | ||
| public static bool TryGetNonEnumeratedCount<TSource>(this IEnumerable<TSource> target, out int count) | ||
| { | ||
| if (target is ICollection<TSource> genericCollection) | ||
| { | ||
| count = genericCollection.Count; | ||
| return true; | ||
| } | ||
|
|
||
| if (target is ICollection collection) | ||
| { | ||
| count = collection.Count; | ||
| return true; | ||
| } | ||
|
|
||
| count = 0; | ||
| return false; | ||
| } | ||
| } | ||
| #endif |