IEnumerableConverterFactory
using System.Collections;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Reflection;
using System.Text.Json.Reflection;
namespace System.Text.Json.Serialization.Converters
{
internal sealed class IEnumerableConverterFactory : JsonConverterFactory
{
private static readonly IDictionaryConverter<IDictionary> s_converterForIDictionary = new IDictionaryConverter<IDictionary>();
private static readonly IEnumerableConverter<IEnumerable> s_converterForIEnumerable = new IEnumerableConverter<IEnumerable>();
private static readonly IListConverter<IList> s_converterForIList = new IListConverter<IList>();
[System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("JSON serialization and deserialization might require types that cannot be statically analyzed. Use the overload that takes a JsonTypeInfo or JsonSerializerContext, or make sure all of the required types are preserved.")]
public IEnumerableConverterFactory()
{
}
public override bool CanConvert(Type typeToConvert)
{
return typeof(IEnumerable).IsAssignableFrom(typeToConvert);
}
[System.Diagnostics.CodeAnalysis.UnconditionalSuppressMessage("ReflectionAnalysis", "IL2026:RequiresUnreferencedCode", Justification = "The ctor is marked RequiresUnreferencedCode.")]
public override JsonConverter CreateConverter(Type typeToConvert, JsonSerializerOptions options)
{
Type type = null;
Type type2 = null;
Type typeFromHandle;
Type compatibleGenericBaseClass;
if (typeToConvert.IsArray) {
if (typeToConvert.GetArrayRank() > 1)
ThrowHelper.ThrowNotSupportedException_SerializationNotSupported(typeToConvert);
typeFromHandle = typeof(ArrayConverter<, >);
type = typeToConvert.GetElementType();
} else if ((compatibleGenericBaseClass = typeToConvert.GetCompatibleGenericBaseClass(typeof(List<>), null, false)) != (Type)null) {
typeFromHandle = typeof(ListOfTConverter<, >);
type = compatibleGenericBaseClass.GetGenericArguments()[0];
} else if ((compatibleGenericBaseClass = typeToConvert.GetCompatibleGenericBaseClass(typeof(Dictionary<, >), null, false)) != (Type)null) {
Type[] genericArguments = compatibleGenericBaseClass.GetGenericArguments();
typeFromHandle = typeof(DictionaryOfTKeyTValueConverter<, , >);
type2 = genericArguments[0];
type = genericArguments[1];
} else if (typeToConvert.IsImmutableDictionaryType(false)) {
Type[] genericArguments = typeToConvert.GetGenericArguments();
typeFromHandle = typeof(ImmutableDictionaryOfTKeyTValueConverterWithReflection<, , >);
type2 = genericArguments[0];
type = genericArguments[1];
} else if ((compatibleGenericBaseClass = typeToConvert.GetCompatibleGenericInterface(typeof(IDictionary<, >))) != (Type)null) {
Type[] genericArguments = compatibleGenericBaseClass.GetGenericArguments();
typeFromHandle = typeof(IDictionaryOfTKeyTValueConverter<, , >);
type2 = genericArguments[0];
type = genericArguments[1];
} else if ((compatibleGenericBaseClass = typeToConvert.GetCompatibleGenericInterface(typeof(IReadOnlyDictionary<, >))) != (Type)null) {
Type[] genericArguments = compatibleGenericBaseClass.GetGenericArguments();
typeFromHandle = typeof(IReadOnlyDictionaryOfTKeyTValueConverter<, , >);
type2 = genericArguments[0];
type = genericArguments[1];
} else if (typeToConvert.IsImmutableEnumerableType(false)) {
typeFromHandle = typeof(ImmutableEnumerableOfTConverterWithReflection<, >);
type = typeToConvert.GetGenericArguments()[0];
} else if ((compatibleGenericBaseClass = typeToConvert.GetCompatibleGenericInterface(typeof(IList<>))) != (Type)null) {
typeFromHandle = typeof(IListOfTConverter<, >);
type = compatibleGenericBaseClass.GetGenericArguments()[0];
} else if ((compatibleGenericBaseClass = typeToConvert.GetCompatibleGenericInterface(typeof(ISet<>))) != (Type)null) {
typeFromHandle = typeof(ISetOfTConverter<, >);
type = compatibleGenericBaseClass.GetGenericArguments()[0];
} else if ((compatibleGenericBaseClass = typeToConvert.GetCompatibleGenericInterface(typeof(ICollection<>))) != (Type)null) {
typeFromHandle = typeof(ICollectionOfTConverter<, >);
type = compatibleGenericBaseClass.GetGenericArguments()[0];
} else if ((compatibleGenericBaseClass = typeToConvert.GetCompatibleGenericBaseClass(typeof(Stack<>), null, false)) != (Type)null) {
typeFromHandle = typeof(StackOfTConverter<, >);
type = compatibleGenericBaseClass.GetGenericArguments()[0];
} else if ((compatibleGenericBaseClass = typeToConvert.GetCompatibleGenericBaseClass(typeof(Queue<>), null, false)) != (Type)null) {
typeFromHandle = typeof(QueueOfTConverter<, >);
type = compatibleGenericBaseClass.GetGenericArguments()[0];
} else if ((compatibleGenericBaseClass = typeToConvert.GetCompatibleGenericBaseClass(typeof(ConcurrentStack<>), null, false)) != (Type)null) {
typeFromHandle = typeof(ConcurrentStackOfTConverter<, >);
type = compatibleGenericBaseClass.GetGenericArguments()[0];
} else if ((compatibleGenericBaseClass = typeToConvert.GetCompatibleGenericBaseClass(typeof(ConcurrentQueue<>), null, false)) != (Type)null) {
typeFromHandle = typeof(ConcurrentQueueOfTConverter<, >);
type = compatibleGenericBaseClass.GetGenericArguments()[0];
} else if ((compatibleGenericBaseClass = typeToConvert.GetCompatibleGenericInterface(typeof(IEnumerable<>))) != (Type)null) {
typeFromHandle = typeof(IEnumerableOfTConverter<, >);
type = compatibleGenericBaseClass.GetGenericArguments()[0];
} else if (typeof(IDictionary).IsAssignableFrom(typeToConvert)) {
if (typeToConvert == typeof(IDictionary))
return s_converterForIDictionary;
typeFromHandle = typeof(IDictionaryConverter<>);
} else if (typeof(IList).IsAssignableFrom(typeToConvert)) {
if (typeToConvert == typeof(IList))
return s_converterForIList;
typeFromHandle = typeof(IListConverter<>);
} else if (typeToConvert.IsNonGenericStackOrQueue()) {
typeFromHandle = typeof(StackOrQueueConverterWithReflection<>);
} else {
if (typeToConvert == typeof(IEnumerable))
return s_converterForIEnumerable;
typeFromHandle = typeof(IEnumerableConverter<>);
}
Type type3;
switch (typeFromHandle.GetGenericArguments().LongLength) {
case 1:
type3 = typeFromHandle.MakeGenericType(typeToConvert);
break;
case 2:
type3 = typeFromHandle.MakeGenericType(typeToConvert, type);
break;
default:
type3 = typeFromHandle.MakeGenericType(typeToConvert, type2, type);
break;
}
return (JsonConverter)Activator.CreateInstance(type3, BindingFlags.Instance | BindingFlags.Public, null, null, null);
}
}
}