我正在使用XmlWriter.Create()
来获取一个写入器实例,然后写入XML。但结果中包含了 <?xml version="1.0" encoding="utf-16" ?>
,我该如何告诉我的xml写入器不要产生它?
使用XmlWriterSettings.OmitXmlDeclaration
。
别忘了把XmlWriterSettings.ConformanceLevel
设置为ConformanceLevel.Fragment
。
您可以创建 XmlTextWriter
的子类,并覆盖 WriteStartDocument()
方法,使其什么也不做:
public class XmlFragmentWriter : XmlTextWriter
{
// Add whichever constructor(s) you need, e.g.:
public XmlFragmentWriter(Stream stream, Encoding encoding) : base(stream, encoding)
{
}
public override void WriteStartDocument()
{
// Do nothing (omit the declaration)
}
}
使用方法:
var stream = new MemoryStream();
var writer = new XmlFragmentWriter(stream, Encoding.UTF8);
// Use the writer ...
参考资料:Scott Hanselman的博客文章。
您可以使用 XmlWriter.Create()
来完成以下操作:
new XmlWriterSettings {
OmitXmlDeclaration = true,
ConformanceLevel = ConformanceLevel.Fragment
}
public static string FormatXml(string xml)
{
if (string.IsNullOrEmpty(xml))
return string.Empty;
try
{
XmlDocument document = new XmlDocument();
document.LoadXml(xml);
using (MemoryStream memoryStream = new MemoryStream())
using (XmlWriter writer = XmlWriter.Create(
memoryStream,
new XmlWriterSettings {
Encoding = Encoding.Unicode,
OmitXmlDeclaration = true,
ConformanceLevel = ConformanceLevel.Fragment,
Indent = true,
NewLineOnAttributes = false }))
{
document.WriteContentTo(writer);
writer.Flush();
memoryStream.Flush();
memoryStream.Position = 0;
using (StreamReader streamReader = new StreamReader(memoryStream))
{
return streamReader.ReadToEnd();
}
}
}
catch (XmlException ex)
{
return "Unformatted Xml version." + Environment.NewLine + ex.Message;
}
catch (Exception ex)
{
return "Unformatted Xml version." + Environment.NewLine + ex.Message;
}
}
ConformanceLevel.Default
和OmitXmlDeclaration = false
可以正常工作,并且不会写入 XML 声明头(当使用XmlDocument.Save
时)。 - Dai