强制 XDocument 使用 UTF-8 编码写入字符串 [英] Force XDocument to write to String with UTF-8 encoding

问题描述

我希望能够使用声明和 UTF-8 编码将 XML 写入字符串.这似乎很难完成.

I want to be able to write XML to a String with the declaration and with UTF-8 encoding. This seems mighty tricky to accomplish.

我已经阅读了一些并为此尝试了一些流行的答案，但它们都有问题.我当前的代码正确输出为 UTF-8，但不保持 XDocument 的原始格式(即缩进/空格)！

I have read around a bit and tried some of the popular answers for this but the they all have issues. My current code correctly outputs as UTF-8 but does not maintain the original formatting of the XDocument (i.e. indents / whitespace)!

有人可以提供一些建议吗?

Can anyone offer some advice please?

XDocument xml = new XDocument(new XDeclaration("1.0", "utf-8", "yes"), xelementXML);

MemoryStream ms = new MemoryStream();
using (XmlWriter xw = new XmlTextWriter(ms, Encoding.UTF8))
{
    xml.Save(xw);
    xw.Flush();

    StreamReader sr = new StreamReader(ms);
    ms.Seek(0, SeekOrigin.Begin);

    String xmlString = sr.ReadToEnd();
}

XML 要求格式与 .ToString() 的格式相同，即

The XML requires the formatting to be identical to the way .ToString() would format it i.e.

<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<root>
    <node>blah</node>
</root>

我现在看到的是

<?xml version="1.0" encoding="utf-8" standalone="yes"?><root><node>blah</node></root>

更新我已经通过添加 XmlTextWriter 设置设法让它工作......虽然它看起来很笨重！

Update I have managed to get this to work by adding XmlTextWriter settings... It seems VERY clunky though!

MemoryStream ms = new MemoryStream();
XmlWriterSettings settings = new XmlWriterSettings();
settings.Encoding = Encoding.UTF8;
settings.ConformanceLevel = ConformanceLevel.Document;
settings.Indent = true;
using (XmlWriter xw = XmlTextWriter.Create(ms, settings))
{
    xml.Save(xw);
    xw.Flush();

    StreamReader sr = new StreamReader(ms);
    ms.Seek(0, SeekOrigin.Begin);
    String blah = sr.ReadToEnd();
}

推荐答案

试试这个:

using System;
using System.IO;
using System.Text;
using System.Xml.Linq;

class Test
{
    static void Main()
    {
        XDocument doc = XDocument.Load("test.xml",
                                       LoadOptions.PreserveWhitespace);
        doc.Declaration = new XDeclaration("1.0", "utf-8", null);
        StringWriter writer = new Utf8StringWriter();
        doc.Save(writer, SaveOptions.None);
        Console.WriteLine(writer);
    }

    private class Utf8StringWriter : StringWriter
    {
        public override Encoding Encoding { get { return Encoding.UTF8; } }
    }
}

当然，您还没有向我们展示您如何构建文档，这使得测试变得困难...我刚刚尝试使用手工构建的 XDocument，其中包含相关的空格也是如此.

Of course, you haven't shown us how you're building the document, which makes it hard to test... I've just tried with a hand-constructed XDocument and that contains the relevant whitespace too.

这篇关于强制 XDocument 使用 UTF-8 编码写入字符串的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！