Uses 64bit to 32bit hash Mapping for primitive, Value, and Reference types<\/p>\n\n\n\n
using System;\nusing System.Collections.Generic;\nusing System.IO;\nusing System.Linq;\nusing System.Reflection;\nusing System.Runtime.Serialization.Formatters.Binary;\nusing System.Security;\n[Serializable]\npublic class MapComparer<T> : IEqualityComparer<T>\n{\n private static Mapping64BitToHash32Bit _hash;\n private static Type _type = typeof(T);\n private static readonly BinaryFormatter _bf = new BinaryFormatter();\n private static readonly MemoryStream _ms = new MemoryStream();\n private readonly bool _isPrimitive;\n public MapComparer()\n {\n _isPrimitive = IsPrimitive();\n _hash = new Mapping64BitToHash32Bit();\n _type = typeof(T);\n }\n public bool Equals(T x, T y)\n {\n if (x == null || y == null)\n return false;\n if (_isPrimitive)\n return x.Equals(y);\n var xb = GetBytesObject(x, _type);\n var yb = GetBytesObject(y, _type);\n if (xb.Length != yb.Length)\n return false;\n return xb.Compare(yb);\n }\n public int GetHashCode(T obj)\n {\n var buf = GetBytesObject(obj, _type);\n return _hash.ComputeHash(buf).ToInt();\n }\n private static byte[] GetBytesObjectSerial(object value)\n {\n if (!_type.IsSerializable)\n return GetBytesObjectR(value);\n _ms.SetLength(0);\n _bf.Serialize(_ms, value);\n return _ms.ToArray().SubArray(0, (int) _ms.Length);\n }\n [SecurityCritical]\n private static byte[] GetBytesObjectR(object data)\n {\n var result = new List<byte>();\n var type = data.GetType();\n IEnumerable<FieldInfo> tFields = type.GetFields();\n foreach (var fieldInfo in tFields)\n {\n var value = fieldInfo.GetValue(data);\n var lt = value.GetType();\n var buf = GetBytesObject(value, lt);\n result.AddRange(buf);\n }\n var p = type.GetNestedTypes();\n if (p.Length > 0)\n foreach (var t in p)\n {\n var nFields = t.GetFields(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Static).ToArray();\n if (nFields.Length > 0)\n if (!nFields[0].IsStatic)\n return result.ToArray();\n foreach (var fieldInfo in nFields)\n {\n var value = fieldInfo.GetValue(null);\n var lt = value.GetType();\n var buf = GetBytesObject(value, lt);\n result.AddRange(buf);\n }\n }\n return result.ToArray();\n }\n [SecurityCritical]\n private static byte[] GetBytesObject(object obj, Type ltype)\n {\n switch (ltype.Name.Trim('[', ']'))\n {\n case \"Byte\":\n return !ltype.IsArray ? new[] {(byte) obj} : (byte[]) obj;\n case \"Boolean\":\n return !ltype.IsArray ? ((bool) obj).GetBytes() : ((bool[]) obj).GetBytes();\n case \"SByte\":\n return !ltype.IsArray ? ((sbyte) obj).GetBytes() : ((sbyte[]) obj).GetBytes();\n case \"Char\":\n return !ltype.IsArray ? ((char) obj).GetBytes() : ((char[]) obj).GetBytes();\n case \"Int16\":\n return !ltype.IsArray ? ((short) obj).GetBytes() : ((short[]) obj).GetBytes();\n case \"UInt16\":\n return !ltype.IsArray ? ((ushort) obj).GetBytes() : ((ushort[]) obj).GetBytes();\n case \"Int32\":\n return !ltype.IsArray ? ((int) obj).GetBytes() : ((int[]) obj).GetBytes();\n case \"UInt32\":\n return !ltype.IsArray ? ((uint) obj).GetBytes() : ((uint[]) obj).GetBytes();\n case \"Int64\":\n return !ltype.IsArray ? ((long) obj).GetBytes() : ((long[]) obj).GetBytes();\n case \"UInt64\":\n return !ltype.IsArray ? ((ulong) obj).GetBytes() : ((ulong[]) obj).GetBytes();\n case \"Single\":\n return !ltype.IsArray ? ((float) obj).GetBytes() : ((float[]) obj).GetBytes();\n case \"Double\":\n return !ltype.IsArray ? ((double) obj).GetBytes() : ((double[]) obj).GetBytes();\n case \"String\":\n return !ltype.IsArray ? ((string) obj).GetBytes() : ((string[]) obj).GetBytes();\n case \"Decimal\":\n return !ltype.IsArray ? ((decimal) obj).GetBytes() : ((decimal[]) obj).GetBytes();\n case \"DateTime\":\n return !ltype.IsArray ? ((DateTime) obj).GetBytes() : ((DateTime[]) obj).GetBytes();\n }\n return GetBytesObjectSerial(obj);\n }\n private bool IsPrimitive()\n {\n switch (Type.GetTypeCode(_type))\n {\n case TypeCode.Boolean:\n case TypeCode.Char:\n case TypeCode.SByte:\n case TypeCode.Byte:\n case TypeCode.Int16:\n case TypeCode.UInt16:\n case TypeCode.Int32:\n case TypeCode.UInt32:\n case TypeCode.Single:\n case TypeCode.String:\n case TypeCode.Decimal:\n case TypeCode.DateTime:\n case TypeCode.Int64:\n case TypeCode.UInt64:\n case TypeCode.Double:\n return true;\n default:\n return false;\n }\n }\n}<\/pre>\n","protected":false},"excerpt":{"rendered":"Uses 64bit to 32bit hash Mapping for primitive, Value, and Reference types<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[2],"tags":[146,62,145],"_links":{"self":[{"href":"https:\/\/michaeljohnsteiner.com\/index.php\/wp-json\/wp\/v2\/posts\/298"}],"collection":[{"href":"https:\/\/michaeljohnsteiner.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/michaeljohnsteiner.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/michaeljohnsteiner.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/michaeljohnsteiner.com\/index.php\/wp-json\/wp\/v2\/comments?post=298"}],"version-history":[{"count":2,"href":"https:\/\/michaeljohnsteiner.com\/index.php\/wp-json\/wp\/v2\/posts\/298\/revisions"}],"predecessor-version":[{"id":303,"href":"https:\/\/michaeljohnsteiner.com\/index.php\/wp-json\/wp\/v2\/posts\/298\/revisions\/303"}],"wp:attachment":[{"href":"https:\/\/michaeljohnsteiner.com\/index.php\/wp-json\/wp\/v2\/media?parent=298"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/michaeljohnsteiner.com\/index.php\/wp-json\/wp\/v2\/categories?post=298"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/michaeljohnsteiner.com\/index.php\/wp-json\/wp\/v2\/tags?post=298"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}