XmlWriter编码问题

Question

我有以下代码：

    MemoryStream ms = new MemoryStream();
    XmlWriter w = XmlWriter.Create(ms);

    w.WriteStartDocument(true);
    w.WriteStartElement("data");

    w.WriteElementString("child", "myvalue");

    w.WriteEndElement();//data
    w.Close();
    ms.Close();

    string test = UTF8Encoding.UTF8.GetString(ms.ToArray());

XML正确生成；但是，我的问题是字符串'test'的第一个字符是ï（字符＃239），使其对某些xml解析器无效：这是哪里来的？我到底在做什么错？

[我知道我可以通过在第一个字符之后开始来解决问题，但我宁愿知道为什么会在那里，而不是简单地解决问题。

谢谢！

Answer 1

在这里找到一个解决方案：https://timvw.be/2007/01/08/generating-utf-8-with-systemxmlxmlwriter/

我在顶部缺少此位置：

XmlWriterSettings xmlWriterSettings = new XmlWriterSettings();
xmlWriterSettings.Encoding = new UTF8Encoding(false);
MemoryStream ms = new MemoryStream();
XmlWriter w = XmlWriter.Create(ms, xmlWriterSettings);

感谢大家的帮助！

Answer 2

问题是，当您使用UTF-8将其转换为字符串时，编写器生成的XML为UTF-16。请尝试以下方法：

StringBuilder sb = new StringBuilder();
using (StringWriter writer = new StringWriter(sb))
using (XmlWriter w = XmlWriter.Create(writer))
{
    w.WriteStartDocument(true);
    w.WriteStartElement("data");

    w.WriteElementString("child", "myvalue");

    w.WriteEndElement();//data
}

string test = sb.ToString();

Answer 3

检查

• XMLTextWriter Encoding problem
• XmlWriter, Strings and Byte Order Marks

Answer 4

您可以像这样更改编码：

w.Settings.Encoding = Encoding.UTF8;

Answer 5

如果您关心编辑器使用的字节顺序标记（例如Visual Studio检测到UTF8编码的XML和正确突出显示语法），所有这些都会略有不同。

这里是解决方法：

MemoryStream stream = new MemoryStream();

XmlWriterSettings settings = new XmlWriterSettings();
settings.Encoding = Encoding.UTF8;
settings.Indent = true;
settings.IndentChars = "\t";

using (XmlWriter writer = XmlWriter.Create(stream, settings))
{
    // ... write

    // Make sure you flush or you only get half the text
    writer.Flush();

    // Use a StreamReader to get the byte order correct
    StreamReader reader = new StreamReader(stream,Encoding.UTF8,true);
    stream.Seek(0, SeekOrigin.Begin);
    result = reader.ReadToEnd();
}

我有2个完整的here代码段>