除了使用继承IConfigurationSectionHandler的方法定义处理自定义节点的类，还可以通过继承ConfigurationSection类实现同样效果。
首先说下.Net配置文件中一个潜规则：
在配置节点时，对于想要进行存储的参数数据，可以采用两种方式：一种是存储到节点的属性中，另一种是存储在节点的文本中。
因为一个节点可以有很多属性，但是只要一个innertext,而要在程序中将这两种形式区分开会带来复杂性。 为了避免这个问题，.net的配置文件只是用属性存储而不使用innertext.
接着，我们来写一个符合这个潜规则的自定义配置文件，方便测试：
<mailServerGroup provider="www.baidu.com">
<mailServers>
<mailServer client="http://blog.csdn.net/lhc1105" address="13232@qq.com" userName="lhc" password="2343254"/>
<mailServer client="http://blog345.csdn.net/lhc1105" address="132wdfgdsggtaewg32@qq.com" userName="dfshs水田如雅" password="2334t243的萨芬234254"/>
<mailServer client="http://blog436.csdn.net/lhc1105" address="132wdgadsfgdtaewg32@qq.com" userName="sdfhdfs水田如雅" password="23ewrty2343的萨芬234254"/>
<mailServer client="http://blo345734g.csdn.net/lhc1105" address="132wdgdfagdstaewg32@qq.com" userName="sdfher水田如雅" password="23erwt43的萨芬234254"/>
</mailServers>
</mailServerGroup>
接着，我们来写相应的处理类，这里我们由内向外来写：
首先是最内层的mailServer:
/// <summary>
/// Class MailServerElement：用于映射mailServer节点，这里是实际存储数据的地方；
/// </summary>
/// <remarks>Editor：v-liuhch CreateTime：2015/6/27 21:51:57</remarks>
public sealed class MailServerElement : ConfigurationElement //配置文件中的配置元素
{
/// <summary>
/// Gets or sets the client.
/// </summary>
/// <value>The client.</value>
/// <remarks>Editor：v-liuhch CreateTime：2015/6/27 22:05:40</remarks>
[ConfigurationProperty("client", IsKey = true, IsRequired = true)] //client是必须的key属性，有点儿主键的意思，例如，如果定义多个client相同的节点，循环读取的话就只读取到最后一个值
public string Client
{
get
{
return this["client"] as string;
}
set
{
this["client"] = value;
}
}
/// <summary>
/// Gets or sets the address.
/// </summary>
/// <value>The address.</value>
/// <remarks>Editor：v-liuhch CreateTime：2015/6/27 22:05:38</remarks>
[ConfigurationProperty("address")]
public string Address
{
get
{
return this["address"] as string;
}
set
{
this["address"] = value;
}
}
/// <summary>
/// Gets or sets the name of the user.
/// </summary>
/// <value>The name of the user.</value>
/// <remarks>Editor：v-liuhch CreateTime：2015/6/27 22:05:35</remarks>
[ConfigurationProperty("userName")]
public string UserName
{
get
{
return this["userName"] as string;
}
set
{
this["userName"] = value;
}
}
/// <summary>
/// Gets or sets the password.
/// </summary>
/// <value>The password.</value>
/// <remarks>Editor：v-liuhch CreateTime：2015/6/27 22:05:33</remarks>
[ConfigurationProperty("password")]
public string Password
{
get
{
return this["password"] as string;
}
set
{
this["password"] = value;
}
}
}
接着是mailServers,它是一个mailServer的集合：
/// <summary>
/// Class MailServerCollection:映射mailServers节点，为一个集合类，另外还包含了很多对节点的操作方法，大部分继承自ConfigurationElementCollection
/// </summary>
/// <remarks>Editor：v-liuhch CreateTime：2015/6/27 21:52:00</remarks>
public sealed class MailServerCollection : ConfigurationElementCollection
{
/// <summary>
/// 获取 <see cref="T:System.Configuration.ConfigurationElementCollection" /> 的类型。
/// </summary>
/// <value>The type of the collection.</value>
/// <returns>此集合的 <see cref="T:System.Configuration.ConfigurationElementCollectionType" />。</returns>
/// <remarks>Editor：v-liuhch CreateTime：2015/6/27 22:05:08</remarks>
public override ConfigurationElementCollectionType CollectionType
{
get
{
return ConfigurationElementCollectionType.BasicMap;
}
}
/// <summary>
/// 当在派生的类中重写时，创建一个新的 <see cref="T:System.Configuration.ConfigurationElement" />。
/// </summary>
/// <returns>新的 <see cref="T:System.Configuration.ConfigurationElement" />。</returns>
/// <remarks>Editor：v-liuhch CreateTime：2015/6/27 22:05:03</remarks>
protected override ConfigurationElement CreateNewElement()
{
return new MailServerElement();
}
/// <summary>
/// 在派生类中重写时获取指定配置元素的元素键。
/// </summary>
/// <param name="element">要为其返回键的 <see cref="T:System.Configuration.ConfigurationElement" />。</param>
/// <returns>一个 <see cref="T:System.Object" />，用作指定 <see cref="T:System.Configuration.ConfigurationElement" /> 的键。</returns>
/// <remarks>Editor：v-liuhch CreateTime：2015/6/27 22:04:51</remarks>
protected override object GetElementKey(ConfigurationElement element)
{
return (element as MailServerElement).Client;
}
/// <summary>
/// 获取在派生的类中重写时用于标识配置文件中此元素集合的名称。
/// </summary>
/// <value>The name of the element.</value>
/// <returns>集合的名称；否则为空字符串。默认值为空字符串。</returns>
/// <remarks>Editor：v-liuhch CreateTime：2015/6/27 23:41:40</remarks>
protected override string ElementName
{
get
{
return "mailServer";
}
}
/// <summary>
/// 获取集合中的元素数。
/// </summary>
/// <value>The count.</value>
/// <returns>集合中的元素数。</returns>
/// <remarks>Editor：v-liuhch CreateTime：2015/6/27 22:08:24</remarks>
public new int Count
{
get { return base.Count; }
}
/// <summary>
/// 获取或设置此配置元素的属性、特性或子元素。
/// </summary>
/// <param name="index">The index.</param>
/// <returns>MailServerElement.</returns>
/// <remarks>Editor：v-liuhch</remarks>
public MailServerElement this[int index]
{
get { return BaseGet(index) as MailServerElement; }
set
{
if (BaseGet(index) != null)
{
BaseRemoveAt(index);
}
BaseAdd(index, value);
}
}
/// <summary>
/// 获取或设置此配置元素的属性、特性或子元素。
/// </summary>
/// <param name="Name">The name.</param>
/// <returns>MailServerElement.</returns>
/// <remarks>Editor：v-liuhch</remarks>
new public MailServerElement this[string Name]
{
get { return BaseGet(Name) as MailServerElement; }
}
/// <summary>
/// Indexes the of.
/// </summary>
/// <param name="element">The element.</param>
/// <returns>System.Int32.</returns>
/// <remarks>Editor：v-liuhch CreateTime：2015/6/27 22:24:16</remarks>
public int IndexOf(MailServerElement element)
{
return BaseIndexOf(element);
}
/// <summary>
/// Adds the specified element.
/// </summary>
/// <param name="element">The element.</param>
/// <remarks>Editor：v-liuhch CreateTime：2015/6/27 22:26:06</remarks>
public void Add(MailServerElement element)
{
BaseAdd(element);
}
/// <summary>
/// Removes the specified element.
/// </summary>
/// <param name="element">The element.</param>
/// <remarks>Editor：v-liuhch CreateTime：2015/6/27 22:27:01</remarks>
public void Remove(MailServerElement element)
{
if (BaseIndexOf(element) > 0)
{
BaseRemove(element.Client);
}
}
/// <summary>
/// Removes at.
/// </summary>
/// <param name="index">The index.</param>
/// <remarks>Editor：v-liuhch CreateTime：2015/6/27 22:33:29</remarks>
public void RemoveAt(int index)
{
BaseRemoveAt(index);
}
/// <summary>
/// Removes the specified client.
/// </summary>
/// <param name="client">The client.</param>
/// <remarks>Editor：v-liuhch CreateTime：2015/6/27 22:34:04</remarks>
public void Remove(string client)
{
BaseRemove(client);
}
/// <summary>
/// Clears this instance.
/// </summary>
/// <remarks>Editor：v-liuhch CreateTime：2015/6/27 22:34:29</remarks>
public void Clear()
{
BaseClear();
}
}
最后是最外层的group:
/// <summary>
/// Class MailServerSection 为入口：
/// </summary>
/// <remarks>Editor：v-liuhch CreateTime：2015/6/27 21:41:02</remarks>
public class MailServerSection : ConfigurationSection //继承配置文件中节
{
/// <summary>
/// Gets the provider.：映射mailServerGroup节点的provider
/// </summary>
/// <value>The provider.</value>
/// <remarks>Editor：v-liuhch CreateTime：2015/6/27 22:05:59</remarks>
[ConfigurationProperty("provider", IsKey = true)]
public string provider { get { return this["provider"] as string; } }
/// <summary>
/// Gets or sets the mail servers.：映射新添加的节点mailServers节点；这个节点下还包含了若干个mailServer节点，因此它是一个集合类
/// </summary>
/// <value>The mail servers.</value>
/// <remarks>Editor：v-liuhch CreateTime：2015/6/27 22:05:56</remarks>
[ConfigurationProperty("mailServers", IsDefaultCollection = false)]
public MailServerCollection MailServers
{
get
{
return this["mailServers"] as MailServerCollection;
}
set
{
this["mailServers"] = value;
}
}
}
同样，关联处理类和节点：
<section name="mailServerGroup" type="继承ConfigurationSection基类.MailServerSection,继承ConfigurationSection基类"/> </configSections>
之后做个测试：
class Program
{
static void Main(string[] args)
{
Test();
}
/// <summary>
/// Tests this instance.：读取节点值示例
/// </summary>
/// <remarks>Editor：v-liuhch CreateTime：2015/6/27 23:04:53</remarks>
private static void Test() {
MailServerSection mailSection = (MailServerSection)ConfigurationManager.GetSection("mailServerGroup");
Console.WriteLine("MailServerSection 的provider属性值："+mailSection.provider);
foreach (MailServerElement config in mailSection.MailServers)
{
Console.WriteLine("----------------------------------");
Console.WriteLine("client值为："+config.Client);
Console.WriteLine("address值为："+config.Address);
Console.WriteLine("username值为："+config.UserName);
Console.WriteLine("password值为："+config.Password);
Console.WriteLine("----------------------------------");
}
Console.ReadKey();
}
}