Fix array of user defined structs serialization failure (#235)

Author: Arkatufus

src/Hyperion.Tests/CollectionTests.cs

@@ -616,5 +616,87 @@ public override ValueSerializer BuildSerializer(Serializer serializer, Type type
 				return os;
 			}
 		}
-	}
+	    
+	    [Fact]
+	    public void CanSerializeNullableIntArray()
+	    {
+		    SerializeAndAssert(new int?[]{1, 2, 3, 4, 5});
+	    }
+
+	    [Fact]
+	    public void CanSerializeLongArray()
+	    {
+		    SerializeAndAssert(new []{1L, 2L, 3L, 4L, 5L});
+	    }
+
+	    [Fact]
+	    public void CanSerializeNullableLongArray()
+	    {
+		    SerializeAndAssert(new long?[]{1L, 2L, 3L, 4L, 5L});
+	    }
+
+	    [Fact]
+	    public void CanSerializeShortArray()
+	    {
+		    SerializeAndAssert(new short[]{1, 2, 3, 4, 5});
+	    }
+        
+	    [Fact]
+	    public void CanSerializeNullableShortArray()
+	    {
+		    SerializeAndAssert(new short?[]{1, 2, 3, 4, 5});
+	    }
+        
+	    [Fact]
+	    public void CanSerializeStringArray()
+	    {
+		    SerializeAndAssert(new []{"1", "2", "3", "4", "5"});
+	    }
+        
+	    [Fact]
+	    public void CanSerializeDateTimeOffsetArray()
+	    {
+		    SerializeAndAssert(new []
+		    {
+			    DateTimeOffset.Now, 
+			    DateTimeOffset.UtcNow,
+		    });
+	    }
+        
+	    [Fact]
+	    public void CanSerializeStructArray()
+	    {
+		    SerializeAndAssert(new IStructInterface[]
+		    {
+			    new PrimitiveStruct {Int = 1, Long = 1, String = "1"},
+			    new PrimitiveStruct {Int = 2, Long = 2, String = "2"},
+			    new PrimitiveStruct {Int = 3, Long = 3, String = "3"},
+			    new PrimitiveStruct {Int = 4, Long = 4, String = "4"},
+			    new PrimitiveStruct {Int = 5, Long = 5, String = "5"},
+		    });
+	    }
+        
+	    private interface IStructInterface
+	    {
+		    int Int { get; set; }
+		    long Long { get; set; }
+		    string String { get; set; }
+	    }
+	    
+	    private struct PrimitiveStruct : IStructInterface
+	    {
+		    public int Int { get; set; }
+		    public long Long { get; set; }
+		    public string String { get; set; }
+	    }	    
+	    
+	    private void SerializeAndAssert<T>(T[] expected)
+	    {
+		    Serialize(expected);
+		    Reset();
+		    var res = Deserialize<T[]>();
+		    Assert.Equal(expected, res);
+		    AssertMemoryStreamConsumed();
+	    }
+    }
 }

src/Hyperion/SerializerFactories/ArraySerializerFactory.cs

@@ -8,8 +8,10 @@
 #endregion
 
 using System;
+using System.Collections;
 using System.Collections.Concurrent;
 using System.IO;
+using System.Linq;
 using Hyperion.Extensions;
 using Hyperion.ValueSerializers;
 
@@ -21,7 +23,7 @@ internal sealed class ArraySerializerFactory : ValueSerializerFactory
 
         public override bool CanDeserialize(Serializer serializer, Type type) => CanSerialize(serializer, type);
 
-        private static void WriteValues<T>(T[] array, Stream stream, Type elementType, ValueSerializer elementSerializer, SerializerSession session)
+        private static void WriteValues(Array array, Stream stream, Type elementType, ValueSerializer elementSerializer, SerializerSession session)
         {
             Int32Serializer.WriteValueImpl(stream, array.Length, session);
             var preserveObjectReferences = session.Serializer.Options.PreserveObjectReferences;
@@ -30,12 +32,13 @@ private static void WriteValues<T>(T[] array, Stream stream, Type elementType, V
                 stream.WriteObject(value, elementType, elementSerializer, preserveObjectReferences, session);
             }
         }
-        private static void ReadValues<T>(int length, Stream stream, DeserializerSession session, T[] array)
+        
+        private static void ReadValues(int length, Stream stream, DeserializerSession session, Array array)
         {
             for (var i = 0; i < length; i++)
             {
-                var value = (T)stream.ReadObject(session);
-                array[i] = value;
+                var value = stream.ReadObject(session);
+                array.SetValue(value, i);
             }
         }
 
@@ -57,7 +60,7 @@ public override ValueSerializer BuildSerializer(Serializer serializer, Type type
                     session.TrackDeserializedObject(array);
                 }
 
-                ReadValues(length, stream, session, (dynamic)array);
+                ReadValues(length, stream, session, array);
 
                 return array;
             };
@@ -68,7 +71,8 @@ public override ValueSerializer BuildSerializer(Serializer serializer, Type type
                     session.TrackSerializedObject(arr);
                 }
 
-                WriteValues((dynamic)arr, stream, elementType, elementSerializer, session);
+                // This janky way of converting array to Array is done to get around the problem of ValueType arrays
+                WriteValues(((IEnumerable)arr).Cast<object>().ToArray(), stream, elementType, elementSerializer, session);
             };
             arraySerializer.Initialize(reader, writer);