graphql-dotnet: Byte Array sent through Variables(graphql .net client library) receive invalid_value

Description

Hi,

I’m trying to create an InputObjectGraphType/ObjectGraphType with a property of byte array. I’m using Json .NET for serialization. I’m trying to receive a byte array property to my server query field resolver but it fails with INVALID_VALUE I’d appreciate your help in understanding what am i doing wrong Thanks a lot in advance!

Steps to reproduce

I have this basic setup:

   public class BytesHolder
    {
        public byte[] Bytes { get; set; }
    }

   public class OutputBytesType : ObjectGraphType<BytesHolder>
    {
        public OutputBytesType()
        {
            Field(x => x.Bytes);
        }
    }

    public class InputBytesType : InputObjectGraphType<BytesHolder>
    {
        public InputBytesType()
        {
            Field(x => x.Bytes);
        }
    }

   public class DemoQuery : ObjectGraphType
    {
        public DemoQuery()
        {
            Field<OutputBytesType>(
                "bytes",
                arguments: new QueryArguments(new QueryArgument<InputBytesType> { Name = "bytesObject" }),
                resolve: context => 
                {
                    var bytesObject = context.GetArgument<BytesHolder>("bytesObject");
                    return bytesObject;
                }
            );
        }
    }

I’m sending this request through a console application client

            var bytesRequest = new GraphQLRequest
            {
                Query = @"
                query BytesRequest($bytesHolder: InputBytesType) {
                    bytes(bytesObject: $bytesHolder) {
                        bytes
                    }
                }",
                Variables = new
                {
                    bytesHolder = new BytesHolder
                    {
                        Bytes = new byte[] { 1, 2, 3, 4 }
                    }
                }
            };

            var graphQLResponse = await graphQLClient.SendQueryAsync<BytesHolder>(bytesRequest);

Upon receiving the request, the server fails to parse the request (it gets to this line:

Register<string, byte>(value => byte.Parse(value, NumberFormatInfo.InvariantInfo));

instead of this line:

Register<string, byte[]>(value => Convert.FromBase64String(value)); // such a built-in conversion for string->byte[] seems useful

Expected result

The server should succeed in parsing the byte array property.

Actual result

The server fails with INVALID_VALUE due to miscalculation in the value converter

Environment

GraphQL 3.0.0, Windows 10, Asp .NET Core 3.1