C#将Xml属性反序列化为值，而不用类包装它。

using System;
using System.IO;
using System.Xml.Serialization;

// 定义要反序列化的Xml数据的类
public class Data
{
    [XmlAttribute("value")]
    public string Value { get; set; }
}

public class Program
{
    public static void Main()
    {
        // 创建XmlSerializer实例
        XmlSerializer serializer = new XmlSerializer(typeof(Data));

        // 创建XmlAttributeOverrides实例
        XmlAttributeOverrides overrides = new XmlAttributeOverrides();

        // 创建XmlAttribute实例，并设置XmlAttribute.XmlAttribute属性为true
        XmlAttributes attributes = new XmlAttributes();
        attributes.XmlAttribute = new XmlAttributeAttribute();

        // 将XmlAttribute实例添加到XmlAttributeOverrides实例中
        overrides.Add(typeof(Data), "Value", attributes);

        // 创建XmlSerializer实例时传入XmlAttributeOverrides实例
        XmlSerializerNamespaces namespaces = new XmlSerializerNamespaces();
        namespaces.Add("", "");

        // 反序列化Xml数据
        using (StringReader reader = new StringReader("<Data value=\"123\"></Data>"))
        {
            Data data = (Data)serializer.Deserialize(reader);

            // 输出反序列化后的值
            Console.WriteLine(data.Value);
        }
    }
}