CollectionsMarshal.cs

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using System.Collections.Generic;
 
namespace System.Runtime.InteropServices;
 
public static class CollectionsMarshal
{
    public static Span<T> AsSpan<T>(List<T>? list)
    {
        if (list != null)
        {
            return new Span<T>(list._items, 0, list._size);
        }
        return default(Span<T>);
    }
 
    public static ref TValue GetValueRefOrNullRef<TKey, TValue>(Dictionary<TKey, TValue> dictionary, TKey key) where TKey : notnull
    {
        return ref dictionary.FindValue(key);
    }
 
    public static ref TValue? GetValueRefOrAddDefault<TKey, TValue>(Dictionary<TKey, TValue> dictionary, TKey key, out bool exists) where TKey : notnull
    {
        return ref Dictionary<TKey, TValue>.CollectionsMarshalHelper.GetValueRefOrAddDefault(dictionary, key, out exists);
    }
}