Question by Noxury · Jan 31, 2020 at 10:53 PM · serialization set binaryformatter hash

Serialize a HashSet for BinaryFormatter using Surrogate

I am using surrogates to convert non-serializable stuff like Vector3, Quaternion to use for BinaryFormmater. I have also a HashSet that stores unique neighbors of the Node class itself. These form a graph object that I want to use for persisting.

So far, the file writing works, but the serialization of HashSet is not implemented (using UnityEditor 5.6.0f3) and as discussed here. Converting to Array seems not suitable for me, because I want to use explicitely HashSet functionality without any extra allocation.

I am unsure if the same approach will be working, just like Vector3 / Quaternion as it deals with a type parameter.

Here is what I have so far.

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 using System.IO;
 using System.Runtime.Serialization.Formatters.Binary;
 using System.Runtime.Serialization;
 
 public class SerializableHashSet<T> : HashSet<T>, ISerializationSurrogate
 {
     // Method called to serialize a HashSet<T> object
     public void GetObjectData(System.Object obj, SerializationInfo info, StreamingContext context)
     {
         HashSet<T> hashset = (HashSet<T>)obj;
         info.AddValue("hashset", hashset);
     }
 
     // Method called to deserialize a HashSet<T> object
     public System.Object SetObjectData(System.Object obj, SerializationInfo info, StreamingContext context,ISurrogateSelector selector)
     {
         HashSet<T> hashset = info.GetValue("hashset", typeof(HashSet<T>));
         obj = hashset;
         return obj;
     }
 }

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