IEnumerableOfTConverter.cs

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using System.Collections.Generic;
 
namespace System.Text.Json.Serialization.Converters;
 
internal sealed class IEnumerableOfTConverter<TCollection, TElement> : IEnumerableDefaultConverter<TCollection, TElement> where TCollection : IEnumerable<TElement>
{
    internal override Type RuntimeType => typeof(List<TElement>);
 
    protected override void Add(in TElement value, ref ReadStack state)
    {
        ((List<TElement>)state.Current.ReturnValue).Add(value);
    }
 
    protected override void CreateCollection(ref Utf8JsonReader reader, ref ReadStack state, JsonSerializerOptions options)
    {
        if (!TypeToConvert.IsAssignableFrom(RuntimeType))
        {
            ThrowHelper.ThrowNotSupportedException_CannotPopulateCollection(TypeToConvert, ref reader, ref state);
        }
        state.Current.ReturnValue = new List<TElement>();
    }
}