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C#的XmlSerializer如何序列化对象为XML?

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发布时间:2025-08-22 09:51:01

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来源于php中文网

原创

c#中序列化对象为xml最直接方式是使用xmlserializer类;2. 核心步骤为创建xmlserializer实例、调用serialize方法写入流;3. 处理复杂类型需注意嵌套对象自动递归、集合默认带包装元素,可用[xmlarray]或[xmlelement]定制;4. 自定义xml结构可用[xmlelement]改元素名、[xmlattribute]变属性、[xmlignore]忽略成员、[xmlinclude]支持多态;5. 常见问题包括必须提供公共无参构造函数、只读属性反序列化失败、循环引用导致栈溢出、首次序列化性能低、命名空间需手动控制;6. 对比其他序列化方式:xmlserializer适合严格xml schema场景,datacontractserializer适合.net内部数据契约,json序列化库适合现代web api和跨平台交互。

C#的XmlSerializer如何序列化对象为XML?

C#中,要将一个对象序列化成XML,最直接且常用的方式就是利用

System.Xml.Serialization
命名空间下的
XmlSerializer
类。它能将对象的公共属性和字段转换为XML元素和属性,反之亦然,实现对象与XML文档之间的双向转换。

解决方案

使用

XmlSerializer
将C#对象序列化为XML,核心步骤是创建一个
XmlSerializer
实例,指定要序列化的对象类型,然后调用其
Serialize
方法,将对象写入到一个流(如
FileStream
MemoryStream
)或
TextWriter
中。

以下是一个简单的示例,展示如何将一个

Book
对象序列化为XML字符串:

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

public class Book
{
    public string Title { get; set; }
    public string Author { get; set; }
    public int PublicationYear { get; set; }
    // 默认构造函数是XmlSerializer序列化和反序列化所必需的
    public Book() { }

    public Book(string title, string author, int year)
    {
        Title = title;
        Author = author;
        PublicationYear = year;
    }
}

public class XmlSerializationExample
{
    public static void Main(string[] args)
    {
        // 创建一个要序列化的对象实例
        Book myBook = new Book("The Hitchhiker's Guide to the Galaxy", "Douglas Adams", 1979);

        // 创建XmlSerializer实例,指定要序列化的类型
        XmlSerializer serializer = new XmlSerializer(typeof(Book));

        // 使用StringWriter来捕获XML输出到字符串
        using (StringWriter writer = new StringWriter())
        {
            // 执行序列化
            serializer.Serialize(writer, myBook);

            // 获取序列化后的XML字符串
            string xmlString = writer.ToString();
            Console.WriteLine("Serialized XML:");
            Console.WriteLine(xmlString);
        }

        // 也可以序列化到文件
        string filePath = "myBook.xml";
        using (FileStream fs = new FileStream(filePath, FileMode.Create))
        {
            serializer.Serialize(fs, myBook);
            Console.WriteLine($"\nObject serialized to {filePath}");
        }

        // 反序列化示例 (从文件读取)
        Console.WriteLine("\nDeserializing from file...");
        using (FileStream fsRead = new FileStream(filePath, FileMode.Open))
        {
            Book deserializedBook = (Book)serializer.Deserialize(fsRead);
            Console.WriteLine($"Deserialized Book: {deserializedBook.Title} by {deserializedBook.Author} ({deserializedBook.PublicationYear})");
        }
    }
}

运行这段代码,你会看到

Book
对象被转换成了一个结构清晰的XML,其中
Title
Author
PublicationYear
都成了XML元素。这感觉就像是把一个C#对象“拍扁”成了文本格式,方便存储和传输。

XmlSerializer在处理复杂类型或集合时有哪些注意事项?

当你的数据模型变得复杂,比如包含嵌套对象、列表或数组时,

XmlSerializer
的处理方式就显得尤为重要,而且它也提供了一些特性(Attributes)来精细控制XML的输出结构。

首先,对于嵌套对象

XmlSerializer
默认会递归地序列化它们。比如,如果你的
Book
类里有一个
Publisher
对象,那么
Publisher
的公共属性也会被序列化为XML元素,嵌套在
元素内部。这很符合直觉,但如果嵌套层级很深,生成的XML可能会变得很冗长。

处理集合类型(如

List
T[]
IEnumerable
)时,
XmlSerializer
会默认生成一个包装元素,其名称通常是“ArrayOf”加上集合元素的类型名。比如
List
会序列化成
......
。如果你觉得这个默认的包装元素名不够语义化,或者根本不想要这个包装,可以使用
[XmlArray("Books")]
[XmlElement("Book")]
来定制。我个人觉得,直接使用
[XmlElement("Book")]
List
属性上,可以避免
ArrayOf
前缀,让XML看起来更简洁,更符合某些API的要求。

更进一步的自定义XML结构,这才是

XmlSerializer
的真正魅力所在:

  • [XmlElement("NewElementName")]
    : 改变属性对应的XML元素名。比如,
    [XmlElement("BookTitle")] public string Title { get; set; }
    会让
    Title
    属性序列化为
    而不是
    </pre>。</li>
    <li>
    <strong><pre class="brush:php;toolbar:false;">[XmlAttribute("Year")]</pre></strong>: 将属性序列化为XML元素的属性而非子元素。<pre class="brush:php;toolbar:false;">[XmlAttribute("Year")] public int PublicationYear { get; set; }</pre>会让<pre class="brush:php;toolbar:false;">PublicationYear</pre>变成<pre class="brush:php;toolbar:false;"><Book Year="1979"></pre>。这在XML中非常常见,比如用于ID或版本号。</li>
    <li>
    <strong><pre class="brush:php;toolbar:false;">[XmlIgnore]</pre></strong>: 忽略某个公共属性或字段,不将其序列化到XML中。如果你的类里有一些内部状态或只读属性,不希望暴露在XML里,这个特性就很有用。</li>
    <li>
    <strong><pre class="brush:php;toolbar:false;">[XmlArray("Items")]</pre> 和 <pre class="brush:php;toolbar:false;">[XmlArrayItem("Item")]</pre></strong>: 精确控制集合的包装元素和内部元素的名称。例如,<pre class="brush:php;toolbar:false;">[XmlArray("Chapters"), XmlArrayItem("Chapter")] public List<string> Chapters { get; set; }</pre>会生成<pre class="brush:php;toolbar:false;"><Chapters><Chapter>...</Chapter></Chapters></pre>。</li>
    <li>
    <strong><pre class="brush:php;toolbar:false;">[XmlInclude(typeof(DerivedType))]</pre></strong>: 这是处理<strong>多态性</strong>的关键。如果你的类包含一个基类类型的属性,但运行时它实际上是派生类的实例,<pre class="brush:php;toolbar:false;">XmlSerializer</pre>默认可能无法正确序列化派生类的特有成员。通过在基类或包含属性的类上添加<pre class="brush:php;toolbar:false;">[XmlInclude(typeof(DerivedType))]</pre>,你可以告诉<pre class="brush:php;toolbar:false;">XmlSerializer</pre>在序列化时,这个属性可能包含<pre class="brush:php;toolbar:false;">DerivedType</pre>的实例,从而正确处理其成员。这对于构建灵活的数据模型非常重要。</li>
    </ul>
    <p>这些特性提供了非常强大的控制力,让你能够将C#对象映射到几乎任何复杂的XML Schema。我通常会根据预期的XML输出结构,灵活运用这些特性,而不是完全依赖<pre class="brush:php;toolbar:false;">XmlSerializer</pre>的默认行为。</p>
    <h3>使用XmlSerializer时常见的序列化问题及如何解决?</h3>
    <p>虽然<pre class="brush:php;toolbar:false;">XmlSerializer</pre>功能强大,但在实际使用中,确实会遇到一些让人头疼的问题。我个人就没少在这上面踩过坑。</p>
    <p>一个最常见、也最让人困惑的问题是:<strong>被序列化的类必须有一个公共的无参构造函数</strong>。哪怕你的类有其他带参数的构造函数,<pre class="brush:php;toolbar:false;">XmlSerializer</pre>在反序列化时,仍然会尝试调用这个默认的无参构造函数来创建对象实例。如果缺少,它就会抛出异常,通常是<pre class="brush:php;toolbar:false;">InvalidOperationException</pre>。解决方案很简单,就是给你的类加一个<pre class="brush:php;toolbar:false;">public YourClass() { }</pre>。这听起来有点反直觉,毕竟很多时候我们习惯用带参数的构造函数来初始化对象,但在序列化/反序列化场景下,这是个铁律。</p>
    <p>其次,<strong>只读属性和私有字段</strong>默认是不会被<pre class="brush:php;toolbar:false;">XmlSerializer</pre>序列化的。<pre class="brush:php;toolbar:false;">XmlSerializer</pre>只关心公共的、可读写的属性和公共字段。如果你想序列化私有数据,你需要通过公共属性来暴露它,或者考虑使用<pre class="brush:php;toolbar:false;">DataContractSerializer</pre>,它对私有成员有更好的支持。对于只读属性(只有<pre class="brush:php;toolbar:false;">get</pre>没有<pre class="brush:php;toolbar:false;">set</pre>),<pre class="brush:php;toolbar:false;">XmlSerializer</pre>可以序列化它,但反序列化时无法设置其值,这可能导致<a style="color:#f60; text-decoration:underline;" title="数据丢失" href="https://www.php.cn/zt/38926.html" target="_blank">数据丢失</a>。</p><div class="aritcle_card flexRow">
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    <p><strong>循环引用</strong>是另一个大问题。如果你的对象图存在循环引用(例如,<pre class="brush:php;toolbar:false;">Person</pre>有一个<pre class="brush:php;toolbar:false;">Car</pre>属性,而<pre class="brush:php;toolbar:false;">Car</pre>又有一个<pre class="brush:php;toolbar:false;">Owner</pre>属性指向同一个<pre class="brush:php;toolbar:false;">Person</pre>),<pre class="brush:php;toolbar:false;">XmlSerializer</pre>无法处理这种情况,它会陷入无限循环,最终导致<pre class="brush:php;toolbar:false;">StackOverflowException</pre>。这是<pre class="brush:php;toolbar:false;">XmlSerializer</pre>的一个设计限制。在设计数据模型时,要特别注意避免这种显式的循环引用,或者在序列化前手动断开这些引用,或者使用<pre class="brush:php;toolbar:false;">[XmlIgnore]</pre>来忽略那些可能导致循环的属性。</p>
    <p><strong>性能问题</strong>也是一个需要考虑的点。<pre class="brush:php;toolbar:false;">XmlSerializer</pre>在首次对特定类型进行序列化或反序列化时,会动态生成一个临时的序列化程序集。这个过程可能会比较耗时,导致第一次操作感觉有点慢。对于生产环境或需要高性能的场景,你可以使用<pre class="brush:php;toolbar:false;">Sgen.exe</pre><a style="color:#f60; text-decoration:underline;" title="工具" href="https://www.php.cn/zt/16887.html" target="_blank">工具</a>来预先生成这个序列化程序集,避免运行时的开销。</p>
    <p>最后,<strong>命名空间问题</strong>有时也会让人困扰。默认情况下,<pre class="brush:php;toolbar:false;">XmlSerializer</pre>会生成一些默认的XML命名空间。如果你需要精确控制XML元素的命名空间,可以使用<pre class="brush:php;toolbar:false;">XmlSerializerNamespaces</pre>类来定义和传递命名空间前缀,或者在类和属性上使用<pre class="brush:php;toolbar:false;">[XmlRoot]</pre>、<pre class="brush:php;toolbar:false;">[XmlElement]</pre>、<pre class="brush:php;toolbar:false;">[XmlAttribute]</pre>等特性来指定<pre class="brush:php;toolbar:false;">Namespace</pre>属性。这在与外部系统集成,需要遵循严格XML Schema时尤为重要。</p>
    <p>处理这些问题,关键在于理解<pre class="brush:php;toolbar:false;">XmlSerializer</pre>的工作原理和限制。很多时候,解决方案就是遵守它的“规矩”,或者在数据模型设计阶段就规避掉这些潜在的问题。</p>
    <h3>XmlSerializer与DataContractSerializer、Json.NET等其他序列化方式的对比与选择?</h3>
    <p>在.NET生态系统中,除了<pre class="brush:php;toolbar:false;">XmlSerializer</pre>,我们还有<pre class="brush:php;toolbar:false;">DataContractSerializer</pre>和用于JSON序列化的<pre class="brush:php;toolbar:false;">Newtonsoft.Json</pre>(或<pre class="brush:php;toolbar:false;">System.Text.Json</pre>)。它们各有侧重,选择哪一个取决于你的具体需求和应用场景。</p>
    <p><strong><pre class="brush:php;toolbar:false;">XmlSerializer</pre></strong>:</p>
    <ul>
    <li>
    <strong>优点</strong>:对XML结构有极致的控制力,可以通过各种特性(<pre class="brush:php;toolbar:false;">[XmlElement]</pre>, <pre class="brush:php;toolbar:false;">[XmlAttribute]</pre>, <pre class="brush:php;toolbar:false;">[XmlArray]</pre>, <pre class="brush:php;toolbar:false;">[XmlArrayItem]</pre>等)精确映射C#对象到复杂的XML Schema。它与SOAP Web Services(ASMX)紧密集成,是处理传统XML格式的首选。</li>
    <li>
    <strong>缺点</strong>:要求被序列化的类有公共无参构造函数;不擅长处理循环引用;默认只序列化公共属性和字段;首次使用性能开销较大。我个人觉得它在处理复杂XML结构时虽然强大,但也意味着配置起来可能比较繁琐。</li>
    <li>
    <strong>适用场景</strong>:与遗留系统交互,特别是基于SOAP的Web服务;需要严格遵循特定XML Schema的场景;对XML输出格式有精细控制需求时。</li>
    </ul>
    <p><strong><pre class="brush:php;toolbar:false;">DataContractSerializer</pre></strong>:</p>
    <ul>
    <li>
    <strong>优点</strong>:更加面向数据契约,通过<pre class="brush:php;toolbar:false;">[DataContract]</pre>和<pre class="brush:php;toolbar:false;">[DataMember]</pre>特性明确指定要序列化的成员,可以序列化私有成员;对版本控制有更好的支持(<pre class="brush:php;toolbar:false;">Order</pre>属性);性能通常比<pre class="brush:php;toolbar:false;">XmlSerializer</pre>好;不要求公共无参构造函数;能更好地处理循环引用(通过对象引用)。它更像是.NET内部对象序列化的通用解决方案。</li>
    <li>
    <strong>缺点</strong>:对生成的XML结构控制力不如<pre class="brush:php;toolbar:false;">XmlSerializer</pre>,生成的XML通常比较冗余,带有默认的命名空间前缀;不适合需要精确匹配外部XML Schema的场景。</li>
    <li>
    <strong>适用场景</strong>:WCF服务;内部应用程序之间的数据交换;当XML结构不是首要考虑,而更关注数据本身的传输和版本兼容性时。</li>
    </ul>
    <p><strong><pre class="brush:php;toolbar:false;">Newtonsoft.Json</pre> (Json.NET) / <pre class="brush:php;toolbar:false;">System.Text.Json</pre></strong>:</p>
    <ul>
    <li>
    <strong>优点</strong>:这些是用于JSON序列化的库,与XML无关。JSON作为一种轻量级的数据交换格式,在现代Web应用、RESTful API和移动开发中占据主导地位。JSON序列化器通常性能优异,生成的数据体积小,易于跨平台解析。<pre class="brush:php;toolbar:false;">Newtonsoft.Json</pre>功能强大、灵活,而<pre class="brush:php;toolbar:false;">System.Text.Json</pre>是.NET Core/.NET 5+内置的高性能选项。</li>
    <li>
    <strong>缺点</strong>:无法生成XML。</li>
    <li>
    <strong>适用场景</strong>:构建RESTful API;前后端分离的Web应用;移动应用数据传输;任何需要轻量级、高性能、跨平台数据交换的场景。</li>
    </ul>
    <p><strong>如何选择?</strong></p>
    <p>我通常会这么考虑:</p>
    <ul>
    <li>
    <strong>如果你的需求是与旧的SOAP服务交互,或者必须生成/解析特定、复杂的XML文件(比如遵循某个行业标准XML Schema)</strong>,那么<pre class="brush:php;toolbar:false;">XmlSerializer</pre>几乎是唯一的选择,尽管它可能需要你投入更多精力去配置和调试。</li>
    <li>
    <strong>如果是在.NET应用程序内部,或者WCF服务之间进行数据传输,并且对XML的具体结构没有那么严格的要求,更注重数据契约和性能</strong>,那么<pre class="brush:php;toolbar:false;">DataContractSerializer</pre>会是更优的选择,它更“现代”一些,用起来也更省心。</li>
    <li>
    <strong>如果你的项目是面向Web API、前后端分离,或者需要与非.NET平台进行数据交互,并且数据格式是JSON</strong>,那么毫无疑问,选择<pre class="brush:php;toolbar:false;">Newtonsoft.Json</pre>或<pre class="brush:php;toolbar:false;">System.Text.Json</pre>。它们是现代应用数据交换的主流。</li>
    </ul>
    <p>简单来说,<pre class="brush:php;toolbar:false;">XmlSerializer</pre>是XML结构控制的专家,<pre class="brush:php;toolbar:false;">DataContractSerializer</pre>是.NET内部数据契约的专家,而JSON序列化库则是Web和跨平台数据交换的专家。根据你的“输出”格式要求和“通信”对象,选择最合适的工具,这才是最高效的做法。</p>					</div>
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