Save a tree as XML using XmlSerializer

在我的一个项目中，需要保存一个这样的树结构：

恰好，这个项目的开发语言是C#，这时我就想到了XmlSerializer，从网上找了一些教程，

最后总算圆满完成任务：

[XmlRoot("HotLines")]
public class HotLines
{
    #region Constructor...
    public HotLines()
    {
        Lines = new List<HotLine>();
        LineGroups = new List<HotLines>();
    }
    #endregion

    #region Properties...
    [XmlAttribute("Name")]
    public string Name
    {
        get;
        set;
    }

    [XmlArray("Lines")]
    [XmlArrayItem("Line", typeof(HotLine))]
    public List<HotLine> Lines
    {
        get;
        set;
    }

    [XmlArray("LineGroups")]
    [XmlArrayItem("Lines", typeof(HotLines))]
    public List<HotLines> LineGroups
    {
        get;
        set;
    }
    #endregion

    #region Utilities...
    static public void SerializeToXML(HotLines lines, string fileName)
    {
        XmlSerializer serializer = new XmlSerializer(typeof(KingTools.HotLines));
        TextWriter textWriter = new StreamWriter(fileName);
        serializer.Serialize(textWriter, lines);
        textWriter.Close();
    }

    static public HotLines DeserializeFromXML(string fileName)
    {
        XmlSerializer deserializer = new XmlSerializer(typeof(KingTools.HotLines), new Type[] { typeof(HotLine) });
        TextReader textReader = new StreamReader(fileName);
        var lines = (HotLines)deserializer.Deserialize(textReader);
        textReader.Close();
        return lines;
    }
    #endregion
}

[XmlRoot("Line")]
public class HotLine
{
    #region Properties...
    [XmlElement("File")]
    public string File
    {
        get;
        set;
    }

    [XmlElement("Column")]
    public int Column
    {
        get;
        set;
    }

    [XmlElement("Comment")]
    public string Comment
    {
        get;
        set;
    }
    #endregion
}

看看最终的代码，不得不为C#开发效率的高效而折服。用C++保存这样的一份数据，想想都怕，不知道其中要出多少幺蛾子。

下面是一份测试代码：

HotLines root = new HotLines();
root.Name = "Root";

HotLine aLine = new HotLine();
aLine.Column = 10;
aLine.File = "Test";

root.Lines.Add(aLine);

HotLines group = new HotLines();
group.Name = "group";

root.LineGroups.Add(group);
group.Lines.Add(aLine);

string fileName = @"c:\lines.xml";
HotLines.SerializeToXML(root, fileName);

var newRoot = HotLines.DeserializeFromXML(fileName);

Assert.AreEqual(newRoot.Name, root.Name);
Assert.AreEqual(newRoot.Lines.Count, root.Lines.Count);
Assert.AreEqual(newRoot.LineGroups.Count, root.LineGroups.Count);

测试代码生成的XML如下：

<?xml version="1.0" encoding="utf-8"?>
<HotLines xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" Name="Root">
  <Lines>
    <Line>
      <File>Test</File>
      <Column>10</Column>
    </Line>
  </Lines>
  <LineGroups>
    <Lines Name="group">
      <Lines>
        <Line>
          <File>Test</File>
          <Column>10</Column>
        </Line>
      </Lines>
      <LineGroups />
    </Lines>
  </LineGroups>
</HotLines>

代码说明一切，XmlSerializer 和 XML Attribute的便利不言自明。