DataContractSerializer - 如何将xml输出到字符串(而不是文件)

using System;
using System.IO;
using System.Runtime.Serialization;
using System.Text;
using System.Xml;

public class Program
{
    [DataContract]
    public class MyClass
    {
        [DataMember]
        public string Name { get; set; }
        [DataMember]
        public int Age { get; set; }
    }

    public static void Main()
    {
        MyClass myObject = new MyClass { Name = "John Doe", Age = 30 };
        string xmlString = SerializeToXmlString(myObject);
        Console.WriteLine(xmlString);
    }

    public static string SerializeToXmlString(MyClass obj)
    {
        DataContractSerializer serializer = new DataContractSerializer(obj.GetType());
        using (MemoryStream memoryStream = new MemoryStream())
        {
            using (XmlDictionaryWriter writer = XmlDictionaryWriter.CreateTextWriter(memoryStream, Encoding.UTF8))
            {
                serializer.WriteObject(writer, obj);
                writer.Flush();
                return Encoding.UTF8.GetString(memoryStream.ToArray());
            }
        }
    }
}