c# - WriteStartDocument 编写的错误 XML 编码标记

Question

我已将 XMLWriter 设置为使用 UTF8 编码，但 WriteStartDocument 方法仍然写入 UTF16 标记。

这是代码的一部分:

            m_sbXML = New System.Text.StringBuilder

            m_xmlWriterSettings = New System.Xml.XmlWriterSettings
            With m_xmlWriterSettings
                .Indent = True
                .IndentChars = "    "
                .Encoding = System.Text.Encoding.UTF8
            End With

            m_xmlWriter = System.Xml.XmlWriter.Create(m_sbXML, m_xmlWriterSettings)

            Call m_xmlWriter.WriteStartDocument()

应该写文档标签:

<?xml version="1.0" encoding="utf-8"?>

而是它写道:

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

Answer 1

您正在写信给 StringBuilder . .NET 中的字符串始终采用 UTF-16 编码。

如果您想创建一个 UTF-8 编码的 XML 文件，请写入 Stream .

示例:

var settings = new XmlWriterSettings
{
    Indent = True,
    IndentChars = "    ",
    Encoding = Encoding.UTF8
};

using (var stream = new MemoryStream())
using (var writer = XmlWriter.Create(stream, settings))
{
    writer.WriteStartDocument();
    // ...
}