<?xml version="1.0" encoding="utf-8"?>

<configuration>

  <!--<otherconfig configSource="XmlConfig\other.config" />-->

  <otherconfig   a="" b="" c=""/>

</configuration>

public class OtherConfigInfo : ConfigurationSection

    {

        /// <summary>

        /// 获取配置信息

        /// </summary>

        /// <returns></returns>

        public static OtherConfigInfo GetConfig()

        {

            return GetConfig("otherconfig");

        }

        /// <summary>

        /// 获取配置信息

        /// </summary>

        /// <param name="sectionName">xml节点名称</param>

        /// <returns></returns>

        public static OtherConfigInfo GetConfig(string sectionName)

        {

            OtherConfigInfo section = (OtherConfigInfo)ConfigurationManager.GetSection(sectionName);

            if (section == null)

                throw new ConfigurationErrorsException("Section " + sectionName + " is not found.");

            return section;

        }

        [ConfigurationProperty("a", IsRequired = false)]

        public string a

        {

            get

            {

                return (string)base["a"];

            }

            set

            {

                base["a"] = value;

            }

        }

        [ConfigurationProperty("b", IsRequired = false)]

        public string b

        {

            get

            {

                return (string)base["b"];

            }

            set

            {

                base["b"] = value;

            }

        }

        [ConfigurationProperty("c", IsRequired = false)]

        public string c

        {

            get

            {

                return (string)base["c"];

            }

            set

            {

                base["c"] = value;

            }

        }

    }

 //调用方法

OtherConfigInfo configInfo = OtherConfigInfo.GetConfig();

 Console.WriteLine(configInfo.a);