没有<？xml>文本声明的.NET XML序列化

我正在尝试像这样生成XML：

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

我有一个类(ObjectClass)用XMLSerialization属性装饰，如下所示：

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

而我真正的黑客直观的想法，只是得到这个工作是做这个，当我序列化：

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>");

但是，这样生成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>

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，有人可以指出我正确的方向吗？作为一个注释，我认为只要在其中添加一个ObjectClass就可以实现APIRequest类(因为有20种不同类型的ObjectClass，每个类都需要这个样板)，但是如果我是错误。

不要使用字符串连接构建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>

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; }
}

没有<？xml>文本声明的.NET XML序列化

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