config中自定义配置

<section name="TestKeyValue" type="System.Configuration.NameValueSectionHandler"></section>

<TestKeyValue>
  <add key="aaa" value="aaa"/>
  <add key="bbb" value="bbbb"/>
  <add key="ccc" value="ccccc"/>
</TestKeyValue>

var testKeyValue = ConfigurationManager.GetSection("TestKeyValue") as System.Collections.Specialized.NameValueCollection;

<section name="TEST" type="TestApplication.Test, TestApplication"></section>

<TEST AAA="10">
  <BBB CCC="20"></BBB>
  <DDD>
    <add  key="aa" value="aaa"></add>
    <add  key="bb" value="bbb"></add>
  </DDD>
</TEST>

public class Test : ConfigurationSection/
{
    [ConfigurationProperty("AAA", IsRequired = true)]
    public int AAA
    {
        get
        {
            return (int)base["AAA"];
        }
        set
        {
            base["AAA"] = value;
        }
    }

    [ConfigurationProperty("BBB", IsRequired = false)]
    public BBB BBB
    {
        get
        {
            return (BBB)base["BBB"];
        }
        set
        {
            base["BBB"] = value;
        }
    }

    [ConfigurationProperty("DDD", Options = ConfigurationPropertyOptions.IsDefaultCollection, IsRequired = true)]
    public NameValueFileCollection DDD
    {
        get
        {
            return (NameValueFileCollection)base["DDD"];
        }
    }
}

public class BBB : ConfigurationElement
{
    [ConfigurationProperty("CCC", IsRequired = true)]
    public int CCC
    {
        get { return (int)base["CCC"]; }
        set { base["CCC"] = value; }
    }
}

[ConfigurationCollection(typeof(KeyValueConfigurationElement))]
public class NameValueFileCollection : ConfigurationElementCollection
{
    new public KeyValueConfigurationElement this[string name]
    {
        get
        {
            return (KeyValueConfigurationElement)base.BaseGet(name);
        }
    }
    protected override ConfigurationElement CreateNewElement()
    {
        return new KeyValueConfigurationElement();
    }

    protected override object GetElementKey(ConfigurationElement element)
    {
        return ((KeyValueConfigurationElement)element).Key;
    }
}

public class KeyValueConfigurationElement : ConfigurationElement
{
    [ConfigurationProperty("key", IsRequired = true)]
    public string Key
    {
        get { return base["key"].ToString(); }
        set { base["key"] = value; }
    }

    [ConfigurationProperty("value", IsRequired = true)]
    public string Value
    {
        get { return base["value"].ToString(); }
        set { base["value"] = value; }
    }
}

var read = ConfigurationManager.GetSection("TEST") as Test;

<sectionGroup name="SectionGroup" >
  <section name="TestGroup" type="TestApplication.TestGroup, TestApplication"/>
  <section name="TestGroup2" type="System.Configuration.NameValueSectionHandler"/>
</sectionGroup>

<SectionGroup>
  <TestGroup>
    <add Name="zhangsan" Age="19" Gender="true" />
    <add Name="lisi" Age="20" Gender="false" />
    <add Name="wangwu" Age="22" Gender="true" />
  </TestGroup>
  <TestGroup2>
    <add key="A" value="aaa"/>
    <add key="B" value="bbb"/>
  </TestGroup2>
</SectionGroup>

public class TestGroup : ConfigurationSection
{
    public static TestGroup FromConfigFile()
    {
        return (TestGroup)ConfigurationManager.GetSection("SectionGroup");
    }

    [ConfigurationProperty("", DefaultValue = null, IsDefaultCollection = true, IsRequired = false)]
    public XDCollection Content
    {
        get { return (XDCollection)base[new ConfigurationProperty("", typeof(XDCollection), null, ConfigurationPropertyOptions.IsDefaultCollection)]; }
    }
}

[ConfigurationCollection(typeof(TestGroupElement))]
public class XDCollection : ConfigurationElementCollection
{
    new public TestGroupElement this[string name]
    {
        get { return (TestGroupElement)base[name]; }
    }

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

    protected override object GetElementKey(ConfigurationElement element)
    {
        return ((TestGroupElement)element).Name;
    }
}

public class TestGroupElement : ConfigurationElement
{
    [ConfigurationProperty("Name", DefaultValue = "JLQ", IsRequired = false)]
    public string Name { get { return (string)base["Name"]; } set { base["Name"] = value; } }

    [ConfigurationProperty("Age", DefaultValue = 18, IsRequired = false)]
    public int Age { get { return (int)base["Age"]; } set { base["Age"] = value; } }

    [ConfigurationProperty("Gender", DefaultValue = false, IsRequired = false)]
    public bool Gender { get { return (bool)base["Gender"]; } set { base["Gender"] = value; } }
}

var testGroup = ConfigurationManager.GetSection("SectionGroup/TestGroup") as TestGroup;
var testGroup2 = ConfigurationManager.GetSection("SectionGroup/TestGroup2") as System.Collections.Specialized.NameValueCollection;