在您的示例配置文件， myConfig 将是一个类继承自配置节名为三个属性 mySubConfig1 ， mySubConfig2 和 mySubConfig3 。

In your example config file, myConfig would be a class that inherits from ConfigurationSection with three properties named mySubConfig1, mySubConfig2 and mySubConfig3.

在 mySubConfig1 属性的类型（以及2和3）将是一个类继承自 ConfigurationElementCollection ，实施的IEnumerable＆LT; ConfigElement＆GT; 并装饰有 ConfigurationCollection （这里的AddItemName属性设置为mySubSubConfig1 ）。

The type of the mySubConfig1 property (as well as 2 and 3) would be a class that inherits from ConfigurationElementCollection, implements IEnumerable<ConfigElement> and is decorated with ConfigurationCollection (where the "AddItemName" property is set to "mySubSubConfig1").

下面是我用在生产部署的方法的完整样本实现。一定要包括System.Configuration的的组装的。 （这是一个有点混乱，因为System.Configuration命名空间是其他assmeblies定义，但必须包括System.Configuration的组装的使用低于code）

Below is a complete sample implementation of an approach I used in a production deployment. Be sure to include the System.Configuration assembly. (It's a bit confusing because the System.Configuration namespace is defined in other assmeblies, but you must include the System.Configuration assembly to use the code below.)

下面是自定义配置类：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Configuration;

namespace ConfigTest {
    class CustomConfigSection : ConfigurationSection {

        [ConfigurationProperty( "ConfigElements", IsRequired = true )]
        public ConfigElementsCollection ConfigElements {
            get {
                return base["ConfigElements"] as ConfigElementsCollection;
            }
        }

    }

    [ConfigurationCollection( typeof( ConfigElement ), AddItemName = "ConfigElement" )]
    class ConfigElementsCollection : ConfigurationElementCollection, IEnumerable<ConfigElement> {

        protected override ConfigurationElement CreateNewElement() {
            return new ConfigElement();
        }

        protected override object GetElementKey( ConfigurationElement element ) {
            var l_configElement = element as ConfigElement;
            if ( l_configElement != null )
                return l_configElement.Key;
            else
                return null;
        }

        public ConfigElement this[int index] {
            get {
                return BaseGet( index ) as ConfigElement;
            }
        }

        #region IEnumerable<ConfigElement> Members

        IEnumerator<ConfigElement> IEnumerable<ConfigElement>.GetEnumerator() {
            return ( from i in Enumerable.Range( 0, this.Count )
                     select this[i] )
                    .GetEnumerator();
        }

        #endregion
    }

    class ConfigElement : ConfigurationElement {

        [ConfigurationProperty( "key", IsKey = true, IsRequired = true )]
        public string Key {
            get {
                return base["key"] as string;
            }
            set {
                base["key"] = value;
            }
        }

        [ConfigurationProperty( "SubElements" )]
        public ConfigSubElementsCollection SubElements {
            get {
                return base["SubElements"] as ConfigSubElementsCollection;
            }
        }

    }

    [ConfigurationCollection( typeof( ConfigSubElement ), AddItemName = "ConfigSubElement" )]
    class ConfigSubElementsCollection : ConfigurationElementCollection, IEnumerable<ConfigSubElement> {

        protected override ConfigurationElement CreateNewElement() {
            return new ConfigSubElement();
        }

        protected override object GetElementKey( ConfigurationElement element ) {
            var l_configElement = element as ConfigSubElement;
            if ( l_configElement != null )
                return l_configElement.Key;
            else
                return null;
        }

        public ConfigSubElement this[int index] {
            get {
                return BaseGet( index ) as ConfigSubElement;
            }
        }

        #region IEnumerable<ConfigSubElement> Members

        IEnumerator<ConfigSubElement> IEnumerable<ConfigSubElement>.GetEnumerator() {
            return ( from i in Enumerable.Range( 0, this.Count )
                     select this[i] )
                    .GetEnumerator();
        }

        #endregion
    }

    class ConfigSubElement : ConfigurationElement {

        [ConfigurationProperty( "key", IsKey = true, IsRequired = true )]
        public string Key {
            get {
                return base["key"] as string;
            }
            set {
                base["key"] = value;
            }
        }

    }


}

下面是App.config文件：

Here's the App.config file:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="CustomConfigSection" type="ConfigTest.CustomConfigSection,ConfigTest" />
  </configSections>

  <CustomConfigSection>
    <ConfigElements>
      <ConfigElement key="Test1">
        <SubElements>
          <ConfigSubElement key="-SubTest1.1" />
          <ConfigSubElement key="-SubTest1.2" />
        </SubElements>
      </ConfigElement>
      <ConfigElement key="Test2">
        <SubElements>
          <ConfigSubElement key="-SubTest2.1" />
          <ConfigSubElement key="-SubTest2.2" />
        </SubElements>
      </ConfigElement>
    </ConfigElements>
  </CustomConfigSection>

</configuration>

最后，这里的code的访问和使用的配置文件：

Finally, here's the code which accesses and uses the config file:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Configuration;

namespace ConfigTest {
    class Program {
        static void Main( string[] args ) {

            var l_configSettings = (CustomConfigSection) ConfigurationManager.GetSection( "CustomConfigSection" );

            foreach ( var l_element in l_configSettings.ConfigElements.AsEnumerable() ) {
                Console.WriteLine( l_element.Key );

                foreach ( var l_subElement in l_element.SubElements.AsEnumerable() ) {
                    Console.WriteLine( l_subElement.Key );
                }

            }

            Console.WriteLine( "Press any key..." );
            Console.ReadKey( true );

        }
    }
}

一个重量更轻的替代方案是由苏尼尔·辛格在他的博客：
http://blogs.quovantis.com/net-creating-a-custom-configuration-section-that-contains-a-collection-of-collections/

A lighter-weight alternative was written by Sunil Singh on his blog:
http://blogs.quovantis.com/net-creating-a-custom-configuration-section-that-contains-a-collection-of-collections/