格式化一个XML文件，使它在c#中看起来更好

// Format the XML text.
StringWriter string_writer = new StringWriter();
XmlTextWriter xml_text_writer = new XmlTextWriter(string_writer);
xml_text_writer.Formatting = Formatting.Indented;
xml_document.WriteTo(xml_text_writer);

// Display the result.
txtResult.Text = string_writer.ToString();

我试着:

internal static void IndentedNewWSDLString(string filePath)
{
    var xml = File.ReadAllText(filePath);
    XDocument doc = XDocument.Parse(xml);
    File.WriteAllText(filePath, doc.ToString());
}

它像预期的那样正常工作。

.NET 2.0忽略名称解析，并使用适当的资源处理、缩进、保留空白和自定义编码:

public static string Beautify(System.Xml.XmlDocument doc)
{
    string strRetValue = null;
    System.Text.Encoding enc = System.Text.Encoding.UTF8;
    // enc = new System.Text.UTF8Encoding(false);

    System.Xml.XmlWriterSettings xmlWriterSettings = new System.Xml.XmlWriterSettings();
    xmlWriterSettings.Encoding = enc;
    xmlWriterSettings.Indent = true;
    xmlWriterSettings.IndentChars = "    ";
    xmlWriterSettings.NewLineChars = "\r\n";
    xmlWriterSettings.NewLineHandling = System.Xml.NewLineHandling.Replace;
    //xmlWriterSettings.OmitXmlDeclaration = true;
    xmlWriterSettings.ConformanceLevel = System.Xml.ConformanceLevel.Document;


    using (System.IO.MemoryStream ms = new System.IO.MemoryStream())
    {
        using (System.Xml.XmlWriter writer = System.Xml.XmlWriter.Create(ms, xmlWriterSettings))
        {
            doc.Save(writer);
            writer.Flush();
            ms.Flush();

            writer.Close();
        } // End Using writer

        ms.Position = 0;
        using (System.IO.StreamReader sr = new System.IO.StreamReader(ms, enc))
        {
            // Extract the text from the StreamReader.
            strRetValue = sr.ReadToEnd();

            sr.Close();
        } // End Using sr

        ms.Close();
    } // End Using ms


    /*
    System.Text.StringBuilder sb = new System.Text.StringBuilder(); // Always yields UTF-16, no matter the set encoding
    using (System.Xml.XmlWriter writer = System.Xml.XmlWriter.Create(sb, settings))
    {
        doc.Save(writer);
        writer.Close();
    } // End Using writer
    strRetValue = sb.ToString();
    sb.Length = 0;
    sb = null;
    */

    xmlWriterSettings = null;
    return strRetValue;
} // End Function Beautify

用法:

System.Xml.XmlDocument xmlDoc = new System.Xml.XmlDocument();
xmlDoc.XmlResolver = null;
xmlDoc.PreserveWhitespace = true;
xmlDoc.Load("C:\Test.svg");
string SVG = Beautify(xmlDoc);

可以使用XmlWriter通过流转换来漂亮地打印XML字符串。XmlReader WriteNode(真正的)。这个方法

将所有内容从读取器复制到写入器，并将读取器移动到下一个同级的开始。

定义以下扩展方法:

public static class XmlExtensions
{
    public static string FormatXml(this string xml, bool indent = true, bool newLineOnAttributes = false, string indentChars = "  ", ConformanceLevel conformanceLevel = ConformanceLevel.Document) => 
        xml.FormatXml( new XmlWriterSettings { Indent = indent, NewLineOnAttributes = newLineOnAttributes, IndentChars = indentChars, ConformanceLevel = conformanceLevel });

    public static string FormatXml(this string xml, XmlWriterSettings settings)
    {
        using (var textReader = new StringReader(xml))
        using (var xmlReader = XmlReader.Create(textReader, new XmlReaderSettings { ConformanceLevel = settings.ConformanceLevel } ))
        using (var textWriter = new StringWriter())
        {
            using (var xmlWriter = XmlWriter.Create(textWriter, settings))
                xmlWriter.WriteNode(xmlReader, true);
            return textWriter.ToString();
        }
    }
}

现在你可以做:

var inXml = @"<?xml version='1.0'?><response><error code='1'> Success</error></response>";
var newXml = inXml.FormatXml(indentChars : "", newLineOnAttributes : false); // Or true, if you prefer
Console.WriteLine(newXml);

的打印

<?xml version='1.0'?>
<response>
<error code="1"> Success</error>
</response>

注:

Other answers load the XML into some Document Object Model such as XmlDocument or XDocument/XElement, then re-serialize the DOM with indentation enabled. This streaming solution completely avoids the added memory overhead of a DOM. In your question you do not add any indentation for the nested <error code='1'> Success</error> node, so I set indentChars : "". Generally an indentation of two spaces per level of nesting is customary. Attribute delimiters will be unconditionally transformed to double-quotes if currently single-quotes. (I believe this is true of other answers as well.) Passing conformanceLevel : ConformanceLevel.Fragment allows strings containing sequences of XML fragments to be formatted. Other than ConformanceLevel.Fragment, the input XML string must be well-formed. If it is not, XmlReader will throw an exception.

这里是小样。

使用XmlTextWriter……

public static string PrintXML(string xml)
{
    string result = "";

    MemoryStream mStream = new MemoryStream();
    XmlTextWriter writer = new XmlTextWriter(mStream, Encoding.Unicode);
    XmlDocument document = new XmlDocument();

    try
    {
        // Load the XmlDocument with the XML.
        document.LoadXml(xml);

        writer.Formatting = Formatting.Indented;

        // Write the XML into a formatting XmlTextWriter
        document.WriteContentTo(writer);
        writer.Flush();
        mStream.Flush();

        // Have to rewind the MemoryStream in order to read
        // its contents.
        mStream.Position = 0;

        // Read MemoryStream contents into a StreamReader.
        StreamReader sReader = new StreamReader(mStream);

        // Extract the text from the StreamReader.
        string formattedXml = sReader.ReadToEnd();

        result = formattedXml;
    }
    catch (XmlException)
    {
        // Handle the exception
    }

    mStream.Close();
    writer.Close();

    return result;
}

带有UTF-8 XML声明的可定制的漂亮XML输出

下面的类定义给出了一个简单的方法，将输入XML字符串转换为带有UTF-8声明的格式化输出XML。它支持XmlWriterSettings类提供的所有配置选项。

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

namespace CJBS.Demo
{
    /// <summary>
    /// Supports formatting for XML in a format that is easily human-readable.
    /// </summary>
    public static class PrettyXmlFormatter
    {

        /// <summary>
        /// Generates formatted UTF-8 XML for the content in the <paramref name="doc"/>
        /// </summary>
        /// <param name="doc">XmlDocument for which content will be returned as a formatted string</param>
        /// <returns>Formatted (indented) XML string</returns>
        public static string GetPrettyXml(XmlDocument doc)
        {
            // Configure how XML is to be formatted
            XmlWriterSettings settings = new XmlWriterSettings 
            {
                Indent = true
                , IndentChars = "  "
                , NewLineChars = System.Environment.NewLine
                , NewLineHandling = NewLineHandling.Replace
                //,NewLineOnAttributes = true
                //,OmitXmlDeclaration = false
            };

            // Use wrapper class that supports UTF-8 encoding
            StringWriterWithEncoding sw = new StringWriterWithEncoding(Encoding.UTF8);

            // Output formatted XML to StringWriter
            using (XmlWriter writer = XmlWriter.Create(sw, settings))
            {
                doc.Save(writer);
            }

            // Get formatted text from writer
            return sw.ToString();
        }



        /// <summary>
        /// Wrapper class around <see cref="StringWriter"/> that supports encoding.
        /// Attribution: http://stackoverflow.com/a/427737/3063884
        /// </summary>
        private sealed class StringWriterWithEncoding : StringWriter
        {
            private readonly Encoding encoding;

            /// <summary>
            /// Creates a new <see cref="PrettyXmlFormatter"/> with the specified encoding
            /// </summary>
            /// <param name="encoding"></param>
            public StringWriterWithEncoding(Encoding encoding)
            {
                this.encoding = encoding;
            }

            /// <summary>
            /// Encoding to use when dealing with text
            /// </summary>
            public override Encoding Encoding
            {
                get { return encoding; }
            }
        }
    }
}

进一步改进的可能性:-

可以创建一个额外的方法GetPrettyXml(XmlDocument doc, XmlWriterSettings settings)，允许调用者自定义输出。 可以添加一个额外的方法GetPrettyXml(String rawXml)来支持解析原始文本，而不是让客户端使用XmlDocument。在我的例子中，我需要使用XmlDocument操作XML，因此我没有添加这个。

用法:

String myFormattedXml = null;
XmlDocument doc = new XmlDocument();
try
{
    doc.LoadXml(myRawXmlString);
    myFormattedXml = PrettyXmlFormatter.GetPrettyXml(doc);
}
catch(XmlException ex)
{
    // Failed to parse XML -- use original XML as formatted XML
    myFormattedXml = myRawXmlString;
}