如何强制XML格式转换为UTF-8？

Question

我试图在以下方式构建的xml中强制执行编码：

XmlWriterSettings       xmlSetting = new XmlWriterSettings();
XmlWriter               xmlWriter;
Str                     res;


xmlSetting.encoding ('UTF-8');
xmlWriter = XmlWriter::newXml(xmlSetting);    
xmlWriter.writeStartDocument();
xmlWriter.writeStartElement('root');
xmlWriter.writeEndElement();
xmlWriter.writeEndDocument();
xmlWriter.flush();
res = xmlWriter.writeToString();    
info(res);

但是我的系统中的结果是：

<?xml version="1.0" encoding="utf-16"?><root />

什么是强制编码为UTF-8的正确方法，是否可行

文档没有提供示例：https://docs.microsoft.com/en-us/previous-versions/dynamics/ax-2012/system-classes/gg929065(v%3dax.60)

Answer 1

如果您正在写一个字符串，那么编码将被UTF-16覆盖。字符串始终是Unicode，即UTF-16。使用writeToString方法无法编写任何其他编码。如果您写入文件，那么您的编码将生效。

XmlWriterSettings       xmlSetting = new XmlWriterSettings();
XmlWriter               xmlWriter;
Str                     res;


xmlSetting.encoding ('UTF-8');

xmlWriter = XMLWriter::newFile(@"C:\TEMP\test.xml", xmlSetting);    
xmlWriter.writeStartDocument();
xmlWriter.writeStartElement('root');
xmlWriter.writeEndElement();
xmlWriter.writeEndDocument();
xmlWriter.flush();