Florian Hockmann created TINKERPOP-2976:
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Summary: InvalidOperationException: Collection was modified in
GraphBinary serialization
Key: TINKERPOP-2976
URL: https://issues.apache.org/jira/browse/TINKERPOP-2976
Project: TinkerPop
Issue Type: Bug
Components: dotnet
Affects Versions: 3.6.4, 3.5.6
Reporter: Florian Hockmann
This was first reported for JanusGraph.Net:
[https://github.com/JanusGraph/janusgraph-dotnet/issues/140]
but the issue is most likely in Gremlin.Net.
{code:java}
System.InvalidOperationException: Collection was modified; enumeration
operation may not execute.
at System.Collections.Generic.Dictionary2.KeyCollection.Enumerator.MoveNext()
at
Gremlin.Net.Structure.IO.GraphBinary.TypeSerializerRegistry.GetSerializerFor(Type
valueType)
at Gremlin.Net.Structure.IO.GraphBinary.GraphBinaryWriter.WriteAsync(Object
value, Stream stream, CancellationToken cancellationToken)
[...]{code}
The problem is most likely that the driver iterates over all supported types in
a {{foreach}} loop to find a type to which the type to be serialized can be
assigned which means that the same serializer can be used. Then this serializer
is registered for the new type which modifies the collection the {{foreach}} is
iterated on, leading to this error.
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