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

问题描述

我希望能够编写XML与申报和使用UTF-8编码的字符串。这似乎是非常困难的完成。

我已经阅读了一下周围，并试图一些流行的答案，这个的，但他们都有问题。我当前的代码正确输出为UTF-8，但不维护的XDocument的原始格式（即缩进/空格）！

任何人都可以提供一些建议吗？

 的XDocument XML =新的XDocument（新XDeclaration（1.0，UTF-8，是），xelementXML）; 
 
的MemoryStream毫秒​​=新的MemoryStream（）;使用
（XmlWriter的XW =新的XmlTextWriter（MS，Encoding.UTF8））
 {
 xml.Save（XW）; 
 xw.Flush（）; 
 
 StreamReader的SR =新的StreamReader（毫秒）; 
 ms.Seek（0，SeekOrigin.Begin）; 
 
字符串的xmlString = sr.ReadToEnd（）; 
} 
  

的

XML要求的格式是相同的方式的ToString（）将其格式化即

 <？XML版本=1.0编码=UTF-8独立=YES>？; 
<根和GT; 
<节点>等等< /节点> 
< /根> 
  

什么我目前看到的是

 <？XML版本=1.0编码=UTF-8独立=YES><根><节点>等等< /节点>< /根> 
  

更新
我设法得到这个由工作加入的XmlTextWriter 设置...似乎很笨重，但！

 的MemoryStream MS =新的MemoryStream（）; 
 XmlWriterSettings设置=新XmlWriterSettings（）; 
 settings.Encoding = Encoding.UTF8; 
 settings.ConformanceLevel = ConformanceLevel.Document; 
 settings.Indent = TRUE;使用（XmlWriter的XW = XmlTextWriter.Create（MS，设置））
 {
 xml.Save（XW）
; 
 xw.Flush（）; 
 
 StreamReader的SR =新的StreamReader（毫秒）; 
 ms.Seek（0，SeekOrigin.Begin）; 
串等等= sr.ReadToEnd（）; 
} 
  

解决方案

试试这个：

 使用系统; 
：使用System.IO; 
使用System.Text; 
使用System.Xml.Linq的; 
 
类测试
 {
静态无效的主要（）
 {
的XDocument DOC = XDocument.Load（的test.xml，
 LoadOptions.PreserveWhitespace）; 
 doc.Declaration =新XDeclaration（1.0，UTF-8，NULL）; 
 StringWriter的作家=新Utf8StringWriter（）; 
 doc.Save（作家，SaveOptions.None）; 
 Console.WriteLine（作家）; 
} 
 
私有类Utf8StringWriter：StringWriter的
 {
公众覆盖编码编码{{返回Encoding.UTF8; }} 
} 
} 
  

当然，你还没有告诉我们你是如何构建文档，这使得它很难对其进行测试...我只是试着用一只手构造的XDocument ，并包含相关空白了。

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.

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)!

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();
}

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>

What I'm currently seeing is

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

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();
}

解决方案

Try this:

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; } }
    }
}

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.

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