gistfile1.txt

using System;
using System.Runtime.Serialization.Formatters.Binary;
using System.IO;

// NOTE A: Change the "struct" to a "class" on line NOTE A below and crash disappears
// NOTE B: Change the "float[] data" to "float data;" on line NOTE B below and crash disappears
// NOTE C: Change SamCombatant() to PlayerCombatant() on line NOTE C below and crash disappears

class Test {
	[Serializable()]
	public struct SerializableColor { // NOTE A
		public float[] data;          // NOTE B
		public SerializableColor(float a) {
			data = new float[] {a};
		}
	}

	[Serializable()]
	public class PlayerCombatant {
		SerializableColor color;
		public PlayerCombatant() {
			color = new SerializableColor(1);
		}
	}

	[Serializable()]
	public class SamCombatant : PlayerCombatant {
	}

	static void Main() {
		Console.WriteLine("AWAKE");

		// Serialize to file
		{
			FileStream fs = new FileStream("DataFile.dat", FileMode.Create);
			BinaryFormatter formatter = new BinaryFormatter();
			formatter.Serialize(fs, new SamCombatant()); // NOTE C
			fs.Close();
		}

		// Deserialize from file
		{
			FileStream fs = new FileStream("DataFile.dat", FileMode.Open);
			BinaryFormatter formatter = new BinaryFormatter();
			formatter.Deserialize(fs);
			fs.Close();
		}
	}
}