ICollectionOfTConverter.cs

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using System.Collections.Generic;
using System.Text.Json.Serialization.Metadata;
 
namespace System.Text.Json.Serialization.Converters;
 
internal sealed class ICollectionOfTConverter<TCollection, TElement> : IEnumerableDefaultConverter<TCollection, TElement> where TCollection : ICollection<TElement>
{
    internal override Type RuntimeType
    {
        get
        {
            if (TypeToConvert.IsAbstract || TypeToConvert.IsInterface)
            {
                return typeof(List<TElement>);
            }
            return TypeToConvert;
        }
    }
 
    protected override void Add(in TElement value, ref ReadStack state)
    {
        TCollection val = (TCollection)state.Current.ReturnValue;
        val.Add(value);
        if (base.IsValueType)
        {
            state.Current.ReturnValue = val;
        }
    }
 
    protected override void CreateCollection(ref Utf8JsonReader reader, ref ReadStack state, JsonSerializerOptions options)
    {
        JsonTypeInfo jsonTypeInfo = state.Current.JsonTypeInfo;
        if (TypeToConvert.IsInterface || TypeToConvert.IsAbstract)
        {
            if (!TypeToConvert.IsAssignableFrom(RuntimeType))
            {
                ThrowHelper.ThrowNotSupportedException_CannotPopulateCollection(TypeToConvert, ref reader, ref state);
            }
            state.Current.ReturnValue = new List<TElement>();
            return;
        }
        if (jsonTypeInfo.CreateObject == null)
        {
            ThrowHelper.ThrowNotSupportedException_DeserializeNoConstructor(TypeToConvert, ref reader, ref state);
        }
        TCollection val = (TCollection)jsonTypeInfo.CreateObject();
        if (val.IsReadOnly)
        {
            ThrowHelper.ThrowNotSupportedException_CannotPopulateCollection(TypeToConvert, ref reader, ref state);
        }
        state.Current.ReturnValue = val;
    }
}