NH-4052 - Adding missing serializable implementation (#1456)

- NH-4052 (#663) has introduced a new exception class but has forgotten to provide its serializable implementation.

Author: fredericDelaporte

src/NHibernate/SchemaValidationException.cs

@@ -1,5 +1,7 @@
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
+using System.Runtime.Serialization;
+using System.Security;
 
 namespace NHibernate
 {
@@ -11,5 +13,18 @@ public SchemaValidationException(string msg, IList<string> validationErrors) : b
 		{
 			ValidationErrors = new ReadOnlyCollection<string>(validationErrors);
 		}
+
+		protected SchemaValidationException(SerializationInfo info, StreamingContext context) : base(info, context)
+		{
+			ValidationErrors =
+				(ReadOnlyCollection<string>) info.GetValue("ValidationErrors", typeof(ReadOnlyCollection<string>));
+		}
+
+		[SecurityCritical]
+		public override void GetObjectData(SerializationInfo info, StreamingContext context)
+		{
+			base.GetObjectData(info, context);
+			info.AddValue("ValidationErrors", ValidationErrors);
+		}
 	}
 }