app.config 配置多项 配置集合 自定义配置(3)

再说说利用app.config配置多个自定义的方法.
先看这个例子:美国家庭Simpson的家里有父亲母亲和三个儿女,而中国的老王只有独生子女.结构如下:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <sectionGroup type="Family.SectionGroups,Family" name="family">
      <section name="simpson" type="Family.Simpson.FamilySection,Family" allowDefinition="Everywhere"/>
      <section name="wang" type="Family.Wang.WangSection,Family" allowDefinition="Everywhere"/>
    </sectionGroup>
  </configSections>

  <family>
  <simpson surname="Simpson">
    <father  firstName="James" lastName="Simpson"/>
    <mother firstName="Kate" lastName="Simpson"/>
    <children >
      <add firstName="Jim" lastName="Simpson"/>
      <add firstName="Aaron" lastName="Simpson"/>
      <add firstName="Lukas" lastName="Simpson"/>

    </children>
  </simpson>

  <wang surname="King">
    <father  firstName="王" lastName="二小"/>
    <mother firstName="李" lastName="菲菲"/>
    <child firstName="王" lastName="博"/>
  </wang>

  </family>

</configuration>

各个Section和ConfigurationElementCollection的实现参见上一篇文章.此处不贴.
注意老王美国家庭区别是:老王家由于只有child,所以没有children,只有一个child属性.

增加一个SectionGroups类,继承自System.Configuration.ConfigurationSectionGroup.

这个SectionGroups类和配置文件中,下面这句话

<sectionGroup type="Family.SectionGroups,Family" name="family">
这句话是对应的,
"Family.SectionGroups"命名空间+类名,Family为程序集;name="fanmily"为配置节点的名称.

class SectionGroups : System.Configuration.ConfigurationSectionGroup
    {

        public Family.Wang.WangSection Wang
        {
            get { return (Family.Wang.WangSection)base.Sections["wang"]; }
        }

        public Family.Simpson.FamilySection Simpson
        {
            get { return (Family.Simpson.FamilySection)base.Sections["simpson"]; }
        }
    }

　　测试代码1

SectionGroups sample = (SectionGroups)System.Configuration.ConfigurationManager.OpenExeConfiguration(System.Configuration.ConfigurationUserLevel.None).SectionGroups["family"];
            Family.Wang.WangSection w = sample.Wang;
            Father f= w.Father;
            Mother m = w.Mother;
            Child c = w.Child;

            Family.Simpson.FamilySection s = sample.Simpson;
            // do  to for s.Father; s.Mother;s.Children

　　测试代码2,也可以这样使用:

Family.Wang.WangSection w = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None).GetSection("family/wang") as Family.Wang.WangSection;

　　测试代码3,这样也行

 System.Configuration.Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);

            ConfigurationSectionGroupCollection sectionGroups = config.SectionGroups;
            foreach (ConfigurationSectionGroup sectionGroup in sectionGroups)
            {
                foreach (ConfigurationSection section in sectionGroup.Sections)//有很多其他默认节点
                {
                    if (section.SectionInformation.Name == "wang")
                    {
                        Family.Wang.WangSection wang = section as Family.Wang.WangSection;
                        Console.WriteLine("father: " + wang.Father.FirstName + " " + wang.Father.LastName);
                        Console.WriteLine("mother: " + wang.Mother.FirstName + " " + wang.Mother.LastName);
                    }
                    if (section.SectionInformation.Name == "simpson")
                    {
                        Family.Simpson.FamilySection simpson = section as Family.Simpson.FamilySection;
                        Console.WriteLine("father: " + simpson.Father.FirstName + " " + simpson.Father.LastName);
                        Console.WriteLine("mother: " + simpson.Mother.FirstName + " " + simpson.Mother.LastName);
                        foreach (Family.Simpson. Child child in simpson.Children)
                        {
                            Console.WriteLine("child: " + child.FirstName + " " + child.LastName);
                        }
                    }
                }
            }

注意:在最上面的app.config文件中,我开始忘记了<family></family>标签,导致读出来的数据始终为空的,白白浪费我2个小时.