C#自定义配置文件节的实现

1.配置文件：（注意configSections必须放在最上面否则会报错）

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="UserDefinedConfiguration" type="ConsoleApplication9.UserDefinedConfiguration,ConsoleApplication9, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" 
        allowLocation="true" 
        allowDefinition="Everywhere"/>
  </configSections>
  <startup>
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.2" />
  </startup>
  <UserDefinedConfiguration id="12" name="hecong" firstProperty="property2">
    <myChildSection url="www.163.com" addr="不知道"></myChildSection><!--子节点-->
  </UserDefinedConfiguration>
</configuration>

 2.配置文件的主类型也就是配置文件section中type所标记的类(注意应用configuration，dll)：

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication9
{
    /// <summary>
    /// 自定义配置文件节点类型
    /// </summary>
    public class UserDefinedConfiguration: ConfigurationSection
    {
        private static UserDefinedConfiguration setting;
        public static UserDefinedConfiguration Setting
        {
            get
            {
                if (setting == null)
                    setting = (UserDefinedConfiguration)ConfigurationManager.GetSection("UserDefinedConfiguration");
                return setting;
            }
        }

        [ConfigurationProperty("id", DefaultValue = "1", IsRequired = true)]
        [StringValidator(InvalidCharacters = "~!@#$%^&*()[]{}/;'"|\", MinLength = 1, MaxLength = 60)]//这个属性只是不出现引号中的字符
        public long Id
        {
            get { return (long)this["id"]; }
            set { this["id"] = value; }
        }

        [ConfigurationProperty("name", DefaultValue = "Lily", IsRequired = true)]
        public string Name
        {
            get { return (string)this["name"]; }
            set { this["name"] = value; }
        }

        [ConfigurationProperty("firstProperty", DefaultValue = "Property1", IsRequired = true)]
        public string FirstProperty
        {
            get { return (string)this["firstProperty"]; }
            set { this["firstProperty"] = value; }
        }

        [ConfigurationProperty("myChildSection")]
        public UrlConfigurationElement MyChildSection//子节点
        {
            get
            { return (UrlConfigurationElement)this["myChildSection"]; }
            set
            { this["myChildSection"] = value; }
        }
    }
}

3.子节点类型：

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication9
{
    public class UrlConfigurationElement: ConfigurationElement
    {
        [ConfigurationProperty("url", DefaultValue = "www.baidu.com", IsRequired = true)]
        public string Url
        {
            get { return (string)this["url"]; }
            set { this["url"] = value; }
        }

        [ConfigurationProperty("addr", DefaultValue = "Lily", IsRequired = true)]
        public string Addr
        {
            get { return (string)this["addr"]; }
            set { this["addr"] = value; }
        }
    }
}

4.后续添加key,value 和多个add节点