ImmutableEnumerableOfTConverter.cs

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using System.Collections.Generic;
using System.Text.Json.Serialization.Metadata;
 
namespace System.Text.Json.Serialization.Converters;
 
internal class ImmutableEnumerableOfTConverter<TCollection, TElement> : IEnumerableDefaultConverter<TCollection, TElement> where TCollection : IEnumerable<TElement>
{
    internal sealed override bool CanHaveIdMetadata => false;
 
    protected sealed override void Add(in TElement value, ref ReadStack state)
    {
        ((List<TElement>)state.Current.ReturnValue).Add(value);
    }
 
    protected sealed override void CreateCollection(ref Utf8JsonReader reader, ref ReadStack state, JsonSerializerOptions options)
    {
        state.Current.ReturnValue = new List<TElement>();
    }
 
    protected sealed override void ConvertCollection(ref ReadStack state, JsonSerializerOptions options)
    {
        JsonTypeInfo jsonTypeInfo = state.Current.JsonTypeInfo;
        Func<IEnumerable<TElement>, TCollection> func = (Func<IEnumerable<TElement>, TCollection>)jsonTypeInfo.CreateObjectWithArgs;
        state.Current.ReturnValue = func((List<TElement>)state.Current.ReturnValue);
    }
}