var s1 = "12";
var s2 = "12";

//序列化方式1
var o3 = Newtonsoft.Json.JsonConvert.DeserializeObject<string>(Newtonsoft.Json.JsonConvert.SerializeObject(s1));
//序列化方式2
MemoryStream stream = new MemoryStream();
System.Runtime.Serialization.Formatters.Binary.BinaryFormatter bf = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();
bf.Serialize(stream, s1);
stream.Seek(0, SeekOrigin.Begin);
var o4 = bf.Deserialize(stream);

//====分割線===================================================

var e1 = object.ReferenceEquals(s1, s2);

var e2 = o4 == s1;

var e3 = s1.Equals(o4);

var e4 = o3 == o4;

Console.ReadKey();

        // Determines whether two strings match.
        public override bool Equals([NotNullWhen(true)] object? obj)
        {
            if (object.ReferenceEquals(this, obj))
                return true;

            if (!(obj is string str))
                return false;

            if (this.Length != str.Length)
                return false;

            return EqualsHelper(this, str);
        }

        // Optimized byte-based SequenceEquals. The "length" parameter for this one is declared a nuint rather than int as we also use it for types other than byte
        // where the length can exceed 2Gb once scaled by sizeof(T).
        public static unsafe bool SequenceEqual(ref byte first, ref byte second, nuint length)