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; }
    }
}