在您的示例配置文件中，myConfig 将是一个继承自 ConfigurationSection 的类，具有名为 mySubConfig1、mySubConfig2 和 mySubConfig3 的三个属性。
mySubConfig1 属性的类型（以及 2 和 3）将是继承自 ConfigurationElementCollection、实现 IEnumerable<ConfigElement> 并用 ConfigurationCollection 装饰的类（其中设置了“AddItemName”属性到“mySubSubConfig1”）。
以下是我在生产部署中使用的方法的完整示例实现。请务必包含 System.Configuration 程序集。 （这有点令人困惑，因为 System.Configuration 命名空间是在其他程序集中定义的，但您必须包含 System.Configuration assembly 才能使用下面的代码。）
以下是自定义配置类：
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;
}
}
}
}
这是 App.config 文件：
<?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，这是访问和使用配置文件的代码：
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 );
}
}
}
Sunil Singh 在他的博客上写了一个更轻量级的替代方案：
http://blogs.quovantis.com/net-creating-a-custom-configuration-section-that-contains-a-collection-of-collections/