Add GetExtension method to GraphQLErrorsException and GraphQLResponse; update Serializer.Deserialize method signature

Author: clement911

GraphQLSharp/Client/Exceptions/GraphQLErrorsException.cs

@@ -18,4 +18,12 @@ public GraphQLErrorsException(GraphQLRequest request, HttpResponse httpResponse,
         this.errors = errors;
         this.extensions = extensions;
     }
+
+    public TExtension GetExtension<TExtension>(string key)
+    {
+        if (extensions == null || !extensions.TryGetValue(key, out var element))
+            return default;
+
+        return Serializer.Deserialize<TExtension>(element.GetRawText());
+    }
 }

GraphQLSharp/Client/Response/GraphQLResponse.cs

@@ -22,4 +22,12 @@ public void ThrowIfAnyError()
         if (errors?.Count > 0)
             throw new GraphQLErrorsException(Request, HttpResponse, errors, extensions);
     }
+
+    public TExtension GetExtension<TExtension>(string key)
+    {
+        if (extensions == null || !extensions.TryGetValue(key, out var element))
+            return default;
+
+        return Serializer.Deserialize<TExtension>(element.GetRawText());
+    }
 }

GraphQLSharp/GraphQLSharp.csproj

@@ -4,7 +4,7 @@
 		<PackageProjectUrl>https://github.com/Wish-Org/GraphQLSharp</PackageProjectUrl>
 		<RepositoryUrl>https://github.com/Wish-Org/GraphQLSharp</RepositoryUrl>
 		<Description>.NET Client for GraphQL - Modern and fast</Description>
-		<Version>2.9.6</Version>
+		<Version>2.9.7</Version>
 		<PackageTags>graphql;client;graphql-client;graphql-generator</PackageTags>
 		<Authors>Wish-Org</Authors>
 		<PackageReadmeFile>README.md</PackageReadmeFile>

GraphQLSharp/Serialization/Serializer.cs

@@ -30,7 +30,7 @@ public static string Serialize(object obj)
         return JsonSerializer.Deserialize(json, type, Options);
     }
 
-    public static T? Deserialize<T>(string json) where T : class
+    public static T? Deserialize<T>(string json)
     {
         return JsonSerializer.Deserialize<T>(json, Options);
     }