CSHARP-994 Add AsyncEnumerable support to RowSet #617
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| // Copyright (C) DataStax Inc. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
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| #if NETSTANDARD2_1_OR_GREATER && !NET10_OR_GREATER // These methods are implemented in .NET 10. | ||
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| using System.Collections.Generic; | ||
| using System.Threading; | ||
| using System.Threading.Tasks; | ||
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| // ReSharper disable once CheckNamespace | ||
| namespace System.Linq | ||
| { | ||
| internal static class AsyncEnumerable | ||
| { | ||
| public static async ValueTask<TSource> FirstAsync<TSource>( | ||
| this IAsyncEnumerable<TSource> source, | ||
| CancellationToken cancellationToken = default) | ||
| { | ||
| await using var e = source.GetAsyncEnumerator(cancellationToken); | ||
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| if (!await e.MoveNextAsync()) | ||
| { | ||
| throw new InvalidOperationException("Sequence contains no elements"); | ||
| } | ||
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| return e.Current; | ||
| } | ||
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| public static async ValueTask<TSource> FirstOrDefaultAsync<TSource>( | ||
| this IAsyncEnumerable<TSource> source, | ||
| CancellationToken cancellationToken = default) | ||
| { | ||
| await using var e = source.GetAsyncEnumerator(cancellationToken); | ||
| return await e.MoveNextAsync() ? e.Current : default; | ||
| } | ||
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| public static async ValueTask<TSource> SingleAsync<TSource>( | ||
| this IAsyncEnumerable<TSource> source, | ||
| CancellationToken cancellationToken = default) | ||
| { | ||
| await using var e = source.GetAsyncEnumerator(cancellationToken); | ||
|
|
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| if (!await e.MoveNextAsync()) | ||
| { | ||
| throw new InvalidOperationException("Sequence contains no elements"); | ||
| } | ||
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| TSource result = e.Current; | ||
| if (await e.MoveNextAsync()) | ||
| { | ||
| throw new InvalidOperationException("Sequence contains more than one element"); | ||
| } | ||
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| return result; | ||
| } | ||
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| public static async ValueTask<TSource> SingleOrDefaultAsync<TSource>( | ||
| this IAsyncEnumerable<TSource> source, | ||
| CancellationToken cancellationToken = default) | ||
| { | ||
| await using var e = source.GetAsyncEnumerator(cancellationToken); | ||
|
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| if (!await e.MoveNextAsync()) | ||
| { | ||
| return default; | ||
| } | ||
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| TSource result = e.Current; | ||
| if (await e.MoveNextAsync()) | ||
| { | ||
| throw new InvalidOperationException("Sequence contains more than one element"); | ||
| } | ||
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| return result; | ||
| } | ||
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| public static async IAsyncEnumerable<TResult> Select<TSource, TResult>( | ||
| this IAsyncEnumerable<TSource> source, | ||
| Func<TSource, TResult> selector) | ||
| { | ||
| await foreach (TSource element in source) | ||
| { | ||
| yield return selector(element); | ||
| } | ||
| } | ||
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| public static async ValueTask<List<TSource>> ToListAsync<TSource>( | ||
| this IAsyncEnumerable<TSource> source, | ||
| CancellationToken cancellationToken = default) | ||
| { | ||
| var list = new List<TSource>(); | ||
| await foreach (TSource element in source.WithCancellation(cancellationToken)) | ||
| { | ||
| list.Add(element); | ||
| } | ||
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| return list; | ||
| } | ||
| } | ||
| } | ||
| #endif | ||
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