序列化对象时省略XML处理指令

下面的链接将带您到一个帖子,其中有人有一个方法通过使用xmlwriter来抑制处理指令,并进入“element”状态,而不是“start”状态。这会导致无法写入处理指令。

Suppress Processing Instruction

如果将XmlWriter传递给序列化程序,它将只发出一个处理 如果xmlwriter的状态为“start”(即没有任何内容)则返回指令 还没写完)。

// Assume we have a type named 'MyType' and a variable of this type named 
'myObject' 
System.Text.StringBuilder output = new System.Text.StringBuilder(); 
System.IO.StringWriter internalWriter = new System.IO.StringWriter(output); 
System.Xml.XmlWriter writer = new System.Xml.XmlTextWriter(internalWriter); 
System.Xml.Serialization.XmlSerializer serializer = new 
System.Xml.Serialization.XmlSerializer(typeof(MyType)); 


writer.WriteStartElement("MyContainingElement"); 
serializer.Serialize(writer, myObject); 
writer.WriteEndElement(); 

在这种情况下,编写器将处于“element”(元素内部)的状态。 所以不会写处理指令。一个你写完的 XML,您可以从基础流中提取文本并将其处理为 心满意足。

我做了一个小小的修正

XmlSerializer serializer = new XmlSerializer(typeof(MyObject));
StringBuilder builder = new StringBuilder();
XmlWriterSettings settings = new XmlWriterSettings();
settings.OmitXmlDeclaration = true;
using ( XmlWriter stringWriter = XmlWriter.Create(builder, settings) )
{   
   serializer.Serialize(stringWriter, comments);  
  return builder.ToString();
}

在2.0中,您将使用 XmLWriterSettings.OmitXmlDeclaration ,并序列化到XML编写器-但是我认为1.1中不存在这种情况;因此不存在 完全地 很有用-但还有一个“考虑升级”的东西…是的,我意识到这并不总是可能的。

省略名称空间怎么样?

而不是使用

XmlSerializerNamespaces namespaces = new XmlSerializerNamespaces();
                namespaces.Add("", "");

前任:

<message xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\">

如果“处理指令”是指XML声明,那么可以通过设置xmlWriterSettings的omitxmlDeclaration属性来避免这种情况。要实现这一点,您需要使用一个XML编写器进行序列化。

XmlSerializer serializer = new XmlSerializer(typeof(MyObject));
StringBuilder builder = new StringBuilder();
XmlWriterSettings settings = new XmlWriterSettings();
settings.OmitXmlDeclaration = true;

using ( XmlWriter stringWriter = new StringWriter(builder, settings) )
{
    serializer.Serialize(stringWriter, comments);
    return builder.ToString();
}

但是,这并不能回答你1.1的问题。好吧,供参考。

这在.NET 1.1中有效。(但你还是应该考虑升级)

    XmlSerializer s1= new XmlSerializer(typeof(MyClass)); 
    XmlSerializerNamespaces ns = new XmlSerializerNamespaces();
    ns.Add( "", "" );


    MyClass c= new MyClass();
    c.PropertyFromDerivedClass= "Hallo";

    sw = new System.IO.StringWriter();
    s1.Serialize(new XTWND(sw), c, ns);
    ....

   /// XmlTextWriterFormattedNoDeclaration
   /// helper class : eliminates the XML Documentation at the
   /// start of a XML doc. 
   /// XTWFND = XmlTextWriterFormattedNoDeclaration
   public class XTWFND : System.Xml.XmlTextWriter
   {
     public XTWFND(System.IO.TextWriter w) : base(w) { Formatting = System.Xml.Formatting.Indented; }
     public override void WriteStartDocument() { }
   }