我正在尝试使用Linq XML命名空间中的XText将换行符插入文本节点。
我有一个包含换行符的字符串，但是我需要找出如何将它们转换为实体字符（即 ），而不仅仅是让它们在XML中显示为新行。
XElement element = new XElement( "NodeName" );
...
string example = "This is a string\nWith new lines in it\n";
element.Add( new XText( example ) );
XmlTextWriter将XElement写出，导致文件包含换行符而不是实体替换。有人遇到过这个问题并找到解决方案吗？ 替换换行符，否则在EXCEL中不会显示换行符。 XmlWriterSettings settings = new XmlWriterSettings();
settings.Indent = true;
settings.CheckCharacters = false;
settings.NewLineChars = " ";
XmlWriter writer = XmlWriter.Create(..., settings);
element.WriteTo(writer);
writer.Flush();
更新:
完整程序
using System;
using System.Xml;
using System.Xml.Linq;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
XElement element = new XElement( "NodeName" );
string example = "This is a string\nWith new lines in it\n";
element.Add( new XText( example ) );
XmlWriterSettings settings = new XmlWriterSettings();
settings.Indent = true;
settings.CheckCharacters = false;
settings.NewLineChars = " ";
XmlWriter writer = XmlWriter.Create(Console.Out, settings);
element.WriteTo(writer);
writer.Flush();
}
}
}
输出：
C:\Users\...\\ConsoleApplication1\bin\Release>ConsoleApplication1.exe
<?xml version="1.0" encoding="ibm850"?> <NodeName>This is a string With new lines in it </NodeName>
和换行符没有区别，因为它们是同一个东西。string s1 = "<root>Test Test2</root>";
string s2 = "<root>Test\nTest2</root>";
XDocument doc1 = XDocument.Parse(s1);
XDocument doc2 = XDocument.Parse(s2);
Console.WriteLine(doc1.ToString());
Console.WriteLine(doc2.ToString());
是XmlTextWriter负责输出转义实体。因此，如果您执行以下操作：
using (XmlTextWriter w = new XmlTextWriter("test.xml", Encoding.UTf8))
{
w.WriteString("");
}
在 text.xml 中还会出现一个转义的 ampersand 输出 &#x10，而这不是您想要的。您希望保留  序列原始状态。
我提出的解决方案是创建一个新的 StreamWriter 实现，能够检测到像 "&#x10;" 这样的转义字符串：
// A StreamWriter that does not escape characters
public class NonXmlEscapingStreamWriter : StreamWriter
{
private const string AmpToken = "amp";
private int _bufferState = 0; // used to keep state
// add other ctors overloads if needed
public NonXmlEscapingStreamWriter(string path)
: base(path)
{
}
// NOTE this code is based on the assumption that StreamWriter
// only overrides these 4 Write functions, which is true today but could change in the future
// and also on the assumption that the XmlTextWrite writes escaped values in a specific WriteXX calls sequence
public override void Write(char value)
{
if (value == '&')
{
if (_bufferState == 0)
{
_bufferState++;
return; // hold it
}
else
{
_bufferState = 0;
}
}
else if (value == ';')
{
if (_bufferState > 1)
{
_bufferState++;
return;
}
else
{
Write('&'); // release what's been held
Write(AmpToken);
_bufferState = 0;
}
}
else if (value == '\n') // detect non escaped \n
{
base.Write(" ");
return;
}
base.Write(value);
}
public override void Write(string value)
{
if (_bufferState > 0)
{
if (value == AmpToken)
{
_bufferState++;
return; // hold it
}
else
{
Write('&'); // release what's been held
_bufferState = 0;
}
}
base.Write(value);
}
public override void Write(char[] buffer, int index, int count)
{
if (_bufferState > 2)
{
_bufferState = 0;
base.Write('&'); // release this anyway
string replace;
if ((buffer != null) && ((replace = GetReplaceLength(buffer, index, count)) != null))
{
base.Write(replace);
base.Write(buffer, index + replace.Length, count - replace.Length);
return;
}
else
{
base.Write(AmpToken); // release this
base.Write(';'); // release this
}
}
base.Write(buffer, index, count);
}
public override void Write(char[] buffer)
{
Write(buffer, 0, buffer != null ? buffer.Length : 0);
}
private string GetReplaceLength(char[] buffer, int index, int count)
{
// this is specific to the 10 character but could be adapted
const string token = "#10;";
if ((index + count) < token.Length)
return null;
// we test the char array to avoid string allocations
for(int i = 0; i < token.Length; i++)
{
if (buffer[index + i] != token[i])
return null;
}
return token;
}
}
你可以像这样使用它：
using (XmlTextWriter w = new XmlTextWriter(new NonXmlEscapingStreamWriter("test.xml")))
{
element.WriteTo(w);
}
注意：尽管它能够检测到孤立的 \n 序列，但我建议您确保在原始文本中所有的 \n 都已经被转义，因此，在实际输出 XML 之前，您需要将 \n 替换为 ，就像这样：
string example = "This is a stringWith new lines in it";
XCData代替XText呢？ - sellmeadog