From d8b055c178b9915dc8f0467e7d61ce54bedc395c Mon Sep 17 00:00:00 2001
From: Steve Wagner <wagner@landaumedia.de>
Date: Mon, 26 Apr 2021 09:55:42 +0200
Subject: [PATCH 1/3] add: PolymorphicTypenameConverter class to handle
 __typename deserialization

---
 .../PolymorphicTypenameConverter.cs           | 32 +++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 src/GraphQL.Client.Serializer.SystemTextJson/PolymorphicTypenameConverter.cs

diff --git a/src/GraphQL.Client.Serializer.SystemTextJson/PolymorphicTypenameConverter.cs b/src/GraphQL.Client.Serializer.SystemTextJson/PolymorphicTypenameConverter.cs
new file mode 100644
index 00000000..c68b2bf4
--- /dev/null
+++ b/src/GraphQL.Client.Serializer.SystemTextJson/PolymorphicTypenameConverter.cs
@@ -0,0 +1,32 @@
+using System;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace GraphQL.Client.Serializer.SystemTextJson
+{
+    public abstract class PolymorphicTypenameConverter<T> : JsonConverter<T>
+    {
+        protected abstract Type Descriminator(string typename);
+
+        public override bool CanConvert(Type typeToConvert) =>
+            typeof(T).IsAssignableFrom(typeToConvert);
+
+        public override T Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+        {
+            var clone = reader; // cause its a struct
+
+            if(clone.TokenType == JsonTokenType.StartObject)
+                clone.Read();
+            if(clone.TokenType != JsonTokenType.PropertyName || clone.GetString() != "__typename")
+                throw new JsonException();
+
+            clone.Read();
+            var type = Descriminator(clone.GetString());
+            object deserialize = JsonSerializer.Deserialize(ref reader, type, options);
+            return (T)deserialize;
+        }
+
+        public override void Write(Utf8JsonWriter writer, T obj, JsonSerializerOptions options) =>
+            throw new NotSupportedException();
+    }
+}

From 7ddf3d01e72918608c3917fe4583301283b4e752 Mon Sep 17 00:00:00 2001
From: Steve Wagner <accounts@lanwin.de>
Date: Tue, 27 Apr 2021 14:42:13 +0200
Subject: [PATCH 2/3] Update
 src/GraphQL.Client.Serializer.SystemTextJson/PolymorphicTypenameConverter.cs

Co-authored-by: Ivan Maximov <sungam3r@yandex.ru>
---
 .../PolymorphicTypenameConverter.cs                          | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/GraphQL.Client.Serializer.SystemTextJson/PolymorphicTypenameConverter.cs b/src/GraphQL.Client.Serializer.SystemTextJson/PolymorphicTypenameConverter.cs
index c68b2bf4..f57370bb 100644
--- a/src/GraphQL.Client.Serializer.SystemTextJson/PolymorphicTypenameConverter.cs
+++ b/src/GraphQL.Client.Serializer.SystemTextJson/PolymorphicTypenameConverter.cs
@@ -15,9 +15,10 @@ public override T Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerial
         {
             var clone = reader; // cause its a struct
 
-            if(clone.TokenType == JsonTokenType.StartObject)
+            if (clone.TokenType == JsonTokenType.StartObject)
                 clone.Read();
-            if(clone.TokenType != JsonTokenType.PropertyName || clone.GetString() != "__typename")
+            if (clone.TokenType != JsonTokenType.PropertyName || clone.GetString() != "__typename")
+
                 throw new JsonException();
 
             clone.Read();

From 574e24c2102be8a0f47d8b6f4fbb7b9629662b56 Mon Sep 17 00:00:00 2001
From: Steve Wagner <accounts@lanwin.de>
Date: Mon, 29 Aug 2022 12:20:15 +0200
Subject: [PATCH 3/3] Update
 src/GraphQL.Client.Serializer.SystemTextJson/PolymorphicTypenameConverter.cs

Co-authored-by: Alexander Rose <alex@rose-a.de>
---
 .../PolymorphicTypenameConverter.cs                             | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/GraphQL.Client.Serializer.SystemTextJson/PolymorphicTypenameConverter.cs b/src/GraphQL.Client.Serializer.SystemTextJson/PolymorphicTypenameConverter.cs
index f57370bb..674e4926 100644
--- a/src/GraphQL.Client.Serializer.SystemTextJson/PolymorphicTypenameConverter.cs
+++ b/src/GraphQL.Client.Serializer.SystemTextJson/PolymorphicTypenameConverter.cs
@@ -6,7 +6,7 @@ namespace GraphQL.Client.Serializer.SystemTextJson
 {
     public abstract class PolymorphicTypenameConverter<T> : JsonConverter<T>
     {
-        protected abstract Type Descriminator(string typename);
+        protected abstract Type GetTypeFromTypenameField(string typename);
 
         public override bool CanConvert(Type typeToConvert) =>
             typeof(T).IsAssignableFrom(typeToConvert);