.NET XML序列化，而不＆LT; XML＆GT;文本声明 [英] .NET XML Serialization without <?xml> text declaration
问题描述
我试图生成XML是这样的：
I'm trying to generate XML like this:
<?xml version="1.0"?>
<!DOCTYPE APIRequest SYSTEM
"https://url">
<APIRequest>
<Head>
<Key>123</Key>
</Head>
<ObjectClass>
<Field>Value</Field
</ObjectClass>
</APIRequest>
我饰XMLSerialization类（对象类）的属性是这样的：
I have a class (ObjectClass) decorated with XMLSerialization attributes like this:
[XmlRoot("ObjectClass")]
public class ObjectClass
{
[XmlElement("Field")]
public string Field { get; set; }
}
和我真的哈克直觉思维刚刚得到这个工作就是要做到这一点，当我序列：
And my really hacky intuitive thought to just get this working is to do this when I serialize:
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>");
不过，这会产生这样的XML：
However, this generates XML like this:
<?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。串行化语句自动添加一个＆LT;。XML文本声明
i.e. the serialize statement is automatically adding a <?xml text declaration.
我知道我攻击这错了，所以可以有人点我在正确的方向？
I know I'm attacking this wrong so can someone point me in the right direction?
作为一个说明，我不认为这会令实际意义，只是做与对象类的APIRequest类在里面（因为有说20种不同类型的对象类的每一个需求，他们周围的这个样板），但纠正我，如果我错了。
As a note, I don't think it will make practical sense to just make an APIRequest class with an ObjectClass in it (because there are say 20 different types of ObjectClass that each needs this boilerplate around them) but correct me if I'm wrong.
推荐答案
切勿使用字符串连接构建XML。这是邪恶的。
Never build xml using string concatenation. It's evil.
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>
code：
Code:
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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