自定义Net Configuration 类 - 继承ConfigurationSection

配置文件在应用程序开发中发挥及其重要的作用，使用配置文件可以动态改变应用程序的程序处理逻辑。
在.net framework 2.0平台中更是使得处理配置文件更加方便、灵活。同时微软也提供了自定义配置文件处理类的功能，

实现自定义配置类主要通过继承ConfigurationSection或者实现IConfigurationSectionHandler
这篇文章介绍的方法是继承 ConfigurationSection的 MySampleConfigurationSection

using System;
using System.Collections.Generic;
using System.Text;

using System.Configuration;

namespace ConfigSample
{
    public class MySampleConfigurationSection : ConfigurationSection
    {
        public MySampleConfigurationSection() { }
        public MySampleConfigurationSection(string attr1)
        {
            MyAttribute1 = attr1;
        }

        [ConfigurationProperty("myAttribute1",DefaultValue="MyAttribute1-default-value",IsRequired=true)]
        public string MyAttribute1
        {
            get { return (string)this["myAttribute1"]; }
            set { this["myAttribute1"] = value; }
        }

        [ConfigurationProperty("myChildSection")]
        public MyChildConfigurationElement MyAttributeElement
        {
            get { return (MyChildConfigurationElement)this["myChildSection"]; }
            set { this["myChildSection"] = value; }
        }
       
    }

    public class MyChildConfigurationElement : ConfigurationElement
    {
        public MyChildConfigurationElement() { }

        public MyChildConfigurationElement(string attr1, string attr2)
        {
            MyChildAttribute1 = attr1;
            MyChildAttribute2 = attr2;
        }

        [ConfigurationProperty("myChildAttribute1")]
        public string MyChildAttribute1
        {
            get { return (string)this["myChildAttribute1"]; }
            set { this["myChildAttribute1"] = value; }
        }

        [ConfigurationProperty("myChildAttribute2")]
        public string MyChildAttribute2
        {
            get { return (string)this["myChildAttribute2"]; }
            set { this["myChildAttribute2"] = value; }
        }
    }
}

测试的app.config 文件

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <sectionGroup name="mySampleConfigurationSectionGroup">
      <section name="mySampleConfigurationSection" type="ConfigSample.MySampleConfigurationSection,ConfigSample,Version=1.0.0.0,Culture=neutral,PublicKeyToken=null" allowLocation="true" allowDefinition="Everywhere"/>
    </sectionGroup>
  </configSections>
  <mySampleConfigurationSectionGroup>
    <mySampleConfigurationSection myAttribute1="MyAttribute1 value">
      <myChildSection myChildAttribute1="MyChildAttribute1 value" myChildAttribute2="MyChildAttribute2 value" />
    </mySampleConfigurationSection>
  </mySampleConfigurationSectionGroup>
</configuration>

测试该Configuration代码

    // get sample configuration section
            MySampleConfigurationSection myConfigSection = (MySampleConfigurationSection)ConfigurationManager.GetSection("mySampleConfigurationSectionGroup/mySampleConfigurationSection");
            if (myConfigSection != null)
            {
                txtMyAttribute1.Text = myConfigSection.MyAttribute1.ToString();
                txtMyChildAttribute1.Text = myConfigSection.MyAttributeElement.MyChildAttribute1.ToString();
                txtMyChildAttribute2.Text = myConfigSection.MyAttributeElement.MyChildAttribute2.ToString();
            }
            else
            {
                MessageBox.Show("Cannot read the sample configuration value");
            }

特别注意的是configure在SectionGroup的调用路径

ConfigurationManager.GetSection("mySampleConfigurationSectionGroup/mySampleConfigurationSection")