public override void SerializeReferences(GraphSerializationContext ctx)
{
if (connections == null)
{
ctx.writer.Write(-1);
}
else
{
ctx.writer.Write(connections.Length);
for (int i = 0; i < connections.Length; i++)
{
ctx.writer.Write(ctx.GetNodeIdentifier(connections[i]));
ctx.writer.Write(connectionCosts[i]);
}
}
}