VS2005中读写配置文件（方法二）

File = App.config

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
    <section name="systems" type="ConfigConsoleApplication.SystemsSection, ConfigConsoleApplication" />
</configSections>
<systems>
    <system name="Production" server="PRODSERVER" database="Prod" />
    <system name="Demo" server="DEMOSERVER" database="Demo" />
    <system name="Testing" server="TESTSERVER" database="Test" />
    <system name="Development" server="DEVSERVER" database="DEV" />
</systems>
</configuration>

File = Program.cs

using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Configuration; // remember to add reference in project
using System.Reflection;
using System.Text;

namespace ConfigConsoleApplication
...{
      public sealed class SystemsSection : ConfigurationSection
      ...{
          public SystemsSection()
          ...{
          }
          [ConfigurationProperty( "", IsDefaultCollectionProperty = true )]
          public SystemsCollection Systems
          ...{
              get
              ...{
                  return (SystemsCollection)base[ "" ];
              }
          }
      }
      public sealed class SystemsCollection : ConfigurationElementCollection
      ...{
          protected override ConfigurationElement CreateNewElement()
          ...{
              return new SystemElement();
          }
          protected override object GetElementKey( ConfigurationElement element )
          ...{
              return ( (SystemElement)element ).Name;
          }
          protected override ConfigurationElementCollectionType CollectionType
          ...{
              get
              ...{
                  return ConfigurationElementCollectionType.BasicMap;
              }
          }
          protected override string ElementName
          ...{
              get
              ...{
                  return "system";
              }
          }
      }
      public sealed class SystemElement : ConfigurationElement
      ...{
          [ConfigurationProperty( "name", IsCollectionKey = true, RequiredValue = true )]
          public string Name
          ...{
              get
              ...{
                  return (string)base[ "name" ];
              }
              set
              ...{
                  base[ "name" ] = value;
              }
          }
          [ConfigurationProperty( "server", RequiredValue = true )]
          public string Server
          ...{
              get
              ...{
                  return (string)base[ "server" ];
              }
              set
              ...{
                  base[ "server" ] = value;
              }
          }
          [ConfigurationProperty( "database", RequiredValue = true )]
          public string Database
          ...{
              get
              ...{
                  return (string)base[ "database" ];
              }
              set
              ...{
                  base[ "database" ] = value;
              }
          }
          public override string ToString()
          ...{
              string output = "SystemElement : ";
              output += string.Format( "Name = {0} ", Name );
              output += string.Format( "Server = {0} ", Server );
              output += string.Format( "Database = {0} ", Database );
              return output;
          }
      }      public class Program
      ...{
          static void Main( string[] args )
          ...{
              SystemsSection sysSection = ConfigurationManager.GetSection( "systems" )
                  as SystemsSection;
              SystemsCollection oneCollection = sysSection.Systems;
              foreach ( SystemElement oneElement in oneCollection )
              ...{
                  Console.WriteLine( oneElement.ToString() );
              }
          }
      }
}