多层级XML的序列化和反序列化

CODING中经常遇到序列化多层级的XML，例如下面这种，假设名字是“Default.xml”，和Program.cs在同一文件夹下

<?xml version="1.0" encoding="utf-8" ?>
<config>
  <rules>
    <rule name="namea">
      <params>
        <item name="p" type="get" pattern="(ios|android|)" />
        <item name="cid" type="get" pattern="(ios|android|)" />
        <item name="type" type="get" pattern="(ios|android|)" />
        <item name="sort" type="get" pattern="(ios|android|)" />
        <item name="action" type="post" pattern="(ios|android|)" />
        <item name="userAgent" type="header" pattern="(ios|android|)" />
      </params>
    </rule>

    <rule name="nameb">
      <params>
        <item name="p" type="get" pattern="(ios|android|)" />
        <item name="cid" type="get" pattern="(ios|android|)" />
        <item name="type" type="get" pattern="(ios|android|)" />
        <item name="sort" type="get" pattern="(ios|android|)" />
        <item name="action" type="post" pattern="(ios|android|)" />
        <item name="userAgent" type="header" pattern="(ios|android|)" />
      </params>
    </rule>

    <rule name="namec">
      <params>
        <item name="p" type="get" pattern="(ios|android|)" />
        <item name="cid" type="get" pattern="(ios|android|)" />
        <item name="type" type="get" pattern="(ios|android|)" />
        <item name="sort" type="get" pattern="(ios|android|)" />
        <item name="action" type="post" pattern="(ios|android|)" />
        <item name="userAgent" type="header" pattern="(ios|android|)" />
      </params>
    </rule>

    <rule name="named">
      <params>
        <item name="p" type="get" pattern="(ios|android|)" />
        <item name="cid" type="get" pattern="(ios|android|)" />
        <item name="type" type="get" pattern="(ios|android|)" />
        <item name="sort" type="get" pattern="(ios|android|)" />
        <item name="action" type="post" pattern="(ios|android|)" />
        <item name="userAgent" type="header" pattern="(ios|android|)" />
      </params>
    </rule>
  </rules>
</config>

我们可以定义这样一个实体类

[XmlType(TypeName = "config")]
    public class XmlConfig
    {
        [XmlArray("rules")]
        public List<rule> rules { get; set; }
    }

    [XmlType(TypeName = "rule")]
    public class rule
    {
        [XmlAttribute]
        public string name { get; set; }

        [XmlArray("params")]
        public List<paramsItem> @params { get; set; }
    }

    [XmlType(TypeName = "item")]
    public class paramsItem
    {
        [XmlAttribute]
        public string name { get; set; }
        [XmlAttribute]
        public string type { get; set; }
        [XmlAttribute]
        public string pattern { get; set; }
    }

接下来是调用序列化和反序列化的方法

   class Program
    {
        //反序列化
        public static T DeserializeFromXml<T>(string filePath)
        {
            try
            {
                if (!File.Exists(filePath))
                    throw new ArgumentNullException(filePath + "不存在");

                using (StreamReader reader = new StreamReader(filePath))
                {
                    XmlSerializer xs = new XmlSerializer(typeof(T));
                    T ret = (T)xs.Deserialize(reader);
                    return ret;
                }
            }
            catch (Exception ex)
            {
                return default(T);
            }
        }

        //序列化
        public static void SerializeToXml<T>(string filePath, T obj)
        {
            try
            {
                using (StreamWriter writer = new StreamWriter(filePath))
                {
                    XmlSerializer xs = new XmlSerializer(typeof(T));
                    xs.Serialize(writer, obj);
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        static void Main(string[] args)
        {
            //这里的相对路径如果直接写“Default.xml”是错误的，因为当前文件实际是在bin文件夹下面
            XmlConfig xml = DeserializeFromXml<XmlConfig>(@"..\..\Default.xml");
            SerializeToXml<XmlConfig>(@"..\..\test.xml",xml);
            Console.ReadKey();
        }
    }