如何使用 XMLWriterClass 在 C# 中生成以下 Xml 代码？

Question

我正在尝试获取这个：

      <ATCWaypointEnd id="KLKP">
      </ATCWaypointEnd>

但我明白了：

      <ATCWaypointEnd id="KLKP"></ATCWaypointEnd>

这是我的代码：

      writer.WriteStartElement("ATCWaypointEnd");
      writer.WriteStartAttribute("id");
      writer.WriteString(ICAO);
      writer.WriteFullEndElement();

Answer 1

我建议创建一个 class 来表示您的 XML 文件，然后使用序列化。这样你就可以让框架创建 XML 元素，你可以很容易地指定它是否应该包含换行符（缩进）。

您还可以使用外部工具生成您的 POCO classes，例如：https://xmltocsharp.azurewebsites.net/

使用您提供的 xml 片段：

// The class representing the XML file
[XmlRoot(ElementName="ATCWaypointEnd")]
public class ATCWaypointEnd 
{
    [XmlAttribute(AttributeName="id")]
    public string Id { get; set; }
}

// The method that will return the object as a XML string
public static string GenerateXml(ATCWaypointEnd obj)
{
    string xml;
    using (var stream = new MemoryStream())
    {
        var serializer = new XmlSerializer(typeof(ATCWaypointEnd));
        
        var writer = new XmlTextWriter(stream, encoding);
        writer.Formatting = Formatting.Indented; // Here

        serializer.Serialize(writer, obj);
        xml = encoding.GetString(stream.ToArray());
    }
    return xml;
}

然后在你的代码中你可以这样使用：

var obj = new ATCWaypointEnd();
obj.Id = "KLKP";

var xml = GenerateXml(obj);

Answer 2

您可以执行以下操作：

writer.WriteStartElement("ATCWaypointEnd");
writer.WriteAttributeString("id", ICAO); 
writer.WriteString(System.Environment.NewLine);
writer.WriteFullEndElement();

完整代码见下方：

添加以下“using”语句：

using System.Xml;
using System.IO;

选项 1：

private void WriteXmlData(string ICAO, string filename)
{

    XmlWriterSettings settings = new XmlWriterSettings();
    settings.Indent = true;
    settings.OmitXmlDeclaration = false;
    settings.NewLineChars = Environment.NewLine;

    string dirName = System.IO.Path.GetDirectoryName(filename);


    if (!System.IO.Directory.Exists(dirName))
    {
        System.Diagnostics.Debug.WriteLine("Output folder doesn't exist. Creating.");

        //create folder if it doesn't exist
        System.IO.Directory.CreateDirectory(dirName);
    }

    using (XmlWriter writer = XmlWriter.Create(filename, settings))
    {
        writer.WriteStartDocument();

        writer.WriteStartElement("ATCWaypointEnd");
        writer.WriteAttributeString("id", ICAO);
        writer.WriteString(System.Environment.NewLine);
        writer.WriteFullEndElement(); 

        writer.WriteEndDocument();

        writer.Close();
        writer.Dispose();
    }

}

用法：

WriteXmlData("KLKP", @"C:\Temp\test.xml");

选项 2：

private string WriteXmlData(string ICAO)
{
    string xmlOutput = string.Empty;

    XmlWriterSettings settings = new XmlWriterSettings();
    settings.Indent = true;
    settings.OmitXmlDeclaration = false;
    settings.NewLineChars = Environment.NewLine;


    using (MemoryStream ms = new MemoryStream())
    {
        using (XmlWriter writer = XmlWriter.Create(ms, settings))
        {
            writer.WriteStartDocument();

            writer.WriteStartElement("ATCWaypointEnd");
            writer.WriteAttributeString("id", ICAO); 
            writer.WriteString(System.Environment.NewLine);
            writer.WriteFullEndElement(); 

            writer.WriteEndDocument();

            writer.Close();
            writer.Dispose();
        }

        //reset position
        ms.Position = 0;
        using (StreamReader sr = new StreamReader(ms))
        {
            //put XML into string
            xmlOutput = sr.ReadToEnd();

            //clean up
            sr.Close();
            sr.Dispose();
        }

        //clean up
        ms.Close();
        ms.Dispose();
    }

    return xmlOutput;
}

用法：

string output = WriteXmlData("KLKP");

如何使用 XMLWriterClass 在 C# 中生成以下 Xml 代码？

How do I generate the following Xml code in C# with XMLWriterClass?

c#

xmlwriter