在C#中，可以通过使用System.Runtime.Serialization命名空间中的DataContractSerializer类来实现对象的序列化和反序列化。

序列化对象示例代码：

using System;using System.IO;using System.Runtime.Serialization;[DataContract]public class Person{[DataMember]public string Name { get; set; }[DataMember]public int Age { get; set; }}class Program{static void Main(){Person person = new Person { Name = "Alice", Age = 30 };DataContractSerializer serializer = new DataContractSerializer(typeof(Person));using (FileStream stream = new FileStream("person.xml", FileMode.Create)){serializer.WriteObject(stream, person);}}}

反序列化对象示例代码：

using System;using System.IO;using System.Runtime.Serialization;class Program{static void Main(){DataContractSerializer serializer = new DataContractSerializer(typeof(Person));using (FileStream stream = new FileStream("person.xml", FileMode.Open)){Person person = (Person)serializer.ReadObject(stream);Console.WriteLine($"Name: {person.Name}, Age: {person.Age}");}}}

以上代码中，Person类使用DataContract和DataMember属性来标记需要序列化的属性，然后通过DataContractSerializer类将对象序列化为XML文件或从XML文件反序列化为对象。