Added RemappedTypeBinder

2DGAMELIB/_2DGAMELIB/RemappedTypeBinder.cs

@@ -0,0 +1,38 @@
+using System;
+using System.Collections.Generic;
+using System.Runtime.Serialization;
+
+namespace _2DGAMELIB
+{
+    public sealed class RemappedTypeBinder : SerializationBinder
+    {
+        private readonly Dictionary<string, Type> _typeOnlyMap = new();
+        private readonly Dictionary<string, (string AssemblyName, Type Type)> _fullMap = new();
+
+        public RemappedTypeBinder Add(string oldTypeName, Type newType)
+        {
+            _typeOnlyMap[oldTypeName] = newType;
+            return this;
+        }
+
+        public RemappedTypeBinder Add(string oldTypeName, string oldAssemblyName, Type newType)
+        {
+            _fullMap[oldTypeName] = (oldAssemblyName, newType);
+            return this;
+        }
+
+        public override Type BindToType(string assemblyName, string typeName)
+        {
+            if (_fullMap.TryGetValue(typeName, out var entry))
+            {
+                if (assemblyName != null && assemblyName.StartsWith(entry.AssemblyName))
+                    return entry.Type;
+            }
+
+            if (_typeOnlyMap.TryGetValue(typeName, out var type))
+                return type;
+
+            return null;
+        }
+    }
+}