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EnumerableExtensions.cs
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EnumerableExtensions.cs
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// Copyright (c) .NET Foundation and contributors. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
using System.Collections;
using System.Collections.Generic;
using System.Linq;
namespace Microsoft.DotNet.Interactive.Formatting;
internal static class EnumerableExtensions
{
public static (IReadOnlyList<T> items, int? remainingCount) TakeAndCountRemaining<T>(
this IEnumerable<T> source,
int count,
bool forceCountRemainder = false)
{
using var enumerator = source.GetEnumerator();
var items = new List<T>();
int? remainingCount = null;
while (enumerator.MoveNext())
{
items.Add(enumerator.Current);
if (items.Count >= count)
{
if (forceCountRemainder)
{
remainingCount = source.Count() - items.Count;
}
else
{
remainingCount = source switch
{
ICollection collection => collection.Count - items.Count,
ICollection<T> collection => collection.Count - items.Count,
_ => null
};
}
return (items, remainingCount);
}
}
return (items, 0);
}
}