[BUG] System.Runtime.Serialization.SerializationException : Serializing delegates is not supported on this platform.

Describe the bug

I trying t serialize undirected graph to binary stream. And getting exception:

Message: 
    System.Runtime.Serialization.SerializationException : Serializing delegates is not supported on this platform.
  Stack Trace: 
    MulticastDelegate.GetObjectData(SerializationInfo info, StreamingContext context)
    WriteObjectInfo.InitSerialize(Object obj, ISurrogateSelector surrogateSelector, StreamingContext context, SerObjectInfoInit serObjectInfoInit, IFormatterConverter converter, ObjectWriter objectWriter, SerializationBinder binder)
    ObjectWriter.Write(WriteObjectInfo objectInfo, NameInfo memberNameInfo, NameInfo typeNameInfo)
    ObjectWriter.Serialize(Object graph, BinaryFormatterWriter serWriter, Boolean fCheck)
    BinaryFormatter.Serialize(Stream serializationStream, Object graph, Boolean check)
    BinaryFormatter.Serialize(Stream serializationStream, Object graph)
    SerializationExtensions.SerializeToBinary[TVertex,TEdge](IGraph`2 graph, Stream stream)

To Reproduce

        [Test]
        public void Test()
        {
            var graph = new UndirectedGraph<VertexTest, EdgeTest>();
            using var stream = new MemoryStream();
            QuikGraph.Serialization.SerializationExtensions.SerializeToBinary(graph, stream);
        }

        [Serializable]
        class VertexTest
        { 
        }

        [Serializable]
        class EdgeTest : IEdge<VertexTest>
        {
            public VertexTest Source { get; }
            public VertexTest Target { get; }
        }

Expected behavior Wiki says:

QuikGraph supports a wide range of targets for maximal compatibility.

.NET Standard 1.3+ .NET Core 1.0+ .NET Framework 3.5+ https://github.com/KeRNeLith/QuikGraph/wiki

I used library in .NET Core 3.1.

There is csproj of my test project

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>netcoreapp3.1</TargetFramework>
    <IsPackable>false</IsPackable>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.5.0" />
    <PackageReference Include="NUnit" Version="3.12.0" />
    <PackageReference Include="NUnit3TestAdapter" Version="3.15.1" />
  </ItemGroup>
</Project>

[KeRNeLith]

@kreghek I finally managed to publish a new version of QuikGraph packages. Those will include fixes about the serialization of graphs not supported on .NET Core platform.

[KeRNeLith]

I don’t know what was your real edge structure but indeed it can produce big stuff in memory since it’s a graph with 50k edges and 100k vertices. BTW the serialization process is in the end performed by the BinaryFormatter which is quite old. As of today, it is maybe not the most efficient serializer. Do you think there really is something wrong there?

Yes but this version was already existing before your report. To have a version including the fix, we will need a new version of both QuikGraph.Serialization and QuikGraph. I didn’t make it for now. Maybe I will try to include lastest PR in this version. Is it ok for you?