没有<？xml>文本声明的.NET XML序列化

Question

没有<？xml>文本声明的.NET XML序列化

Mat*_*ell 20 .net xml-serialization .net-2.0

我正在尝试生成这样的XML:

<?xml version="1.0"?>
<!DOCTYPE APIRequest SYSTEM
"https://url">
<APIRequest>
  <Head>
      <Key>123</Key>
  </Head>
  <ObjectClass>
    <Field>Value</Field
  </ObjectClass>
</APIRequest>

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我有一个用XMLSerialization属性装饰的类(ObjectClass),如下所示:

[XmlRoot("ObjectClass")]
public class ObjectClass
{
    [XmlElement("Field")]
    public string Field { get; set; }
}

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而我真正的hacky直觉思想让我的工作就是在序列化时这样做:

ObjectClass inst = new ObjectClass();
XmlSerializer serializer = new XmlSerializer(inst.GetType(), "");

StringWriter w = new StringWriter();
w.WriteLine(@"<?xml version=""1.0""?>");
w.WriteLine("<!DOCTYPE APIRequest SYSTEM");
w.WriteLine(@"""https://url"">");
w.WriteLine("<APIRequest>");
w.WriteLine("<Head>");
w.WriteLine(@"<Field>Value</Field>");
w.WriteLine(@"</Head>");

XmlSerializerNamespaces ns = new XmlSerializerNamespaces();
ns.Add("", ""); 
serializer.Serialize(w, inst, ns);

w.WriteLine("</APIRequest>");

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但是,这会生成如下XML:

<?xml version="1.0"?>
<!DOCTYPE APIRequest SYSTEM
"https://url">
<APIRequest>
  <Head>
      <Key>123</Key>
  </Head>
  <?xml version="1.0" encoding="utf-16"?>
  <ObjectClass>
    <Field>Value</Field>
  </ObjectClass>
</APIRequest>

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即serialize语句自动添加<？xml文本声明.

我知道我正在攻击这个错误,所以有人能指出我正确的方向吗？

作为一个注释,我认为只使用一个带有ObjectClass的APIRequest类来实现它是否具有实际意义(因为有20种不同类型的ObjectClass,每个都需要这个样板文件)但如果我是正确的话,请纠正我错误.

Answer 1

小智 31

试试这个:

internal static string ToXml(object obj)
{
  string retval = null;
  if (obj != null)
  {
    StringBuilder sb = new StringBuilder();
    using(XmlWriter writer = XmlWriter.Create(sb, new XmlWriterSettings() { OmitXmlDeclaration = true }))
    {
      new XmlSerializer(obj.GetType()).Serialize(writer, obj);
    }
    retval = sb.ToString();
  }
  return retval;
}

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Answer 2

sis*_*sve 24

永远不要使用字符串连接来构建xml.这是邪恶的.

输出:

<?xml version="1.0" encoding="utf-16"?>
<!DOCTYPE APIRequest SYSTEM "https://url">
<APIRequest>
  <Head>
    <Key>123</Key>
  </Head>
  <ObjectClass>
    <Field>Value</Field>
  </ObjectClass>
</APIRequest>

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码:

using System;
using System.Diagnostics;
using System.Text;
using System.Xml;
using System.Xml.Serialization;

public static class Program {
    public static void Main() {
        var obj = new ObjectClass { Field = "Value" };

        var settings = new XmlWriterSettings {
            Indent = true
        };

        var xml = new StringBuilder();
        using (var writer = XmlWriter.Create(xml, settings)) {
            Debug.Assert(writer != null);

            writer.WriteDocType("APIRequest", null, "https://url", null);
            writer.WriteStartElement("APIRequest");
            writer.WriteStartElement("Head");
            writer.WriteElementString("Key", "123");
            writer.WriteEndElement(); // </Head>

            var nsSerializer = new XmlSerializerNamespaces();
            nsSerializer.Add("", "");

            var xmlSerializer = new XmlSerializer(obj.GetType(), "");
            xmlSerializer.Serialize(writer, obj, nsSerializer);

            writer.WriteEndElement(); // </APIRequest>
        }

        Console.WriteLine(xml.ToString());
        Console.ReadLine();
    }
}

[XmlRoot("ObjectClass")]
public class ObjectClass {
    [XmlElement("Field")]
    public string Field { get; set; }
}

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