C# 读取配置文件

例如：从下面的 wxpay.config 配置文件中获取相关的信息：

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="paysection" type="Test.Common.PaymentSection, Test.Common" />
  </configSections>
  <paysection>
    <pays>
      <!--微信扫码和公众号支付-->
      <pay name="WXPAY">
        <adds>
          <!-- 微信订单下载信息" -->
          <add key="" value="https://api.mch.weixin.qq.com/pay/downloadbill" />
          <!-- 下载多少天前的支付订单 -->
          <add key="" value="1" />
          <!-- FTP服务器ip -->
          <add key="" value="" />
          <!-- FTP服务器账号 -->
          <add key="" value="" />
          <!-- FTP服务器密码 -->
          <add key="" value="" />
          <!-- FTP服务器文件保存路径{0}表示订单下载日期 -->
          <add key="" value="" />
        </adds>
      </pay>
    </pays>
  </paysection>
</configuration>

处理方法：

string file = Path.Combine(System.AppDomain.CurrentDomain.BaseDirectory, "wxpay.config");
ExeConfigurationFileMap map = new ExeConfigurationFileMap();
map.ExeConfigFilename = file;
var configManager = ConfigurationManager.OpenMappedExeConfiguration(map, ConfigurationUserLevel.None);
if (configManager.HasFile)
{
    instance = (PaymentSection)configManager.GetSection(paysection);
}

PaymentSection 类的代码如下：

public class PaymentSection : ConfigurationSection
{
    internal const string SECTION_NAME = "paysection";

    /// <summary>
    /// 支付配置
    /// </summary>
    [ConfigurationProperty("pays", Options = ConfigurationPropertyOptions.IsRequired)]
    public PayCollection PaySection
    {
        get { return (PayCollection)base["pays"]; }

    }
}

/// <summary>
/// 
/// </summary>
public class PayCollection : ConfigurationElementCollection
{
    /// <summary>
    /// 
    /// </summary>
    public PayCollection()
    {
        base.AddElementName = "pay";
    }

    /// <summary>
    /// 
    /// </summary>
    /// <returns></returns>
    protected override ConfigurationElement CreateNewElement()
    {
        return new PayElement();
    }

    /// <summary>
    /// key查询值
    /// </summary>
    /// <param name="key">key</param>
    /// <returns></returns>
    public PayElement this[object key]
    {
        get { return (PayElement)base.BaseGet(key); }
    }

    /// <summary>
    /// 
    /// </summary>
    /// <param name="element"></param>
    /// <returns></returns>
    protected override object GetElementKey(ConfigurationElement element)
    {
        var el = (element as PayElement);
        return string.Format("{0}", el.Name);
    }
}

public class PayElement : ConfigurationElement
{
    /// <summary>
    /// 元素类型
    /// </summary>
    [ConfigurationProperty("name", IsRequired = true, IsKey = true)]
    public string Name
    {
        get { return (string)base["name"]; }
        set { base["name"] = value; }
    }
}