C# WinForm开发中使用XML配置文件实例

<?xml version="1.0" encoding="utf-8" ?>
<root>
  <connstring>provider=sqloledb;Data Source=127.0.0.1;Initial Catalog=splaybow;User Id=splaybow;Password=splaybow;</connstring>
  <!--Email SMTP info-->
  <smtpip>127.0.0.1</smtpip>
  <smtpuser>splaybow@jb51.net</smtpuser>
  <smtppass>splaybow</smtppass>
</root>

//数据库配置信息
public static string ConnString = "";
//SMTP发信账号信息
public static string SmtpIp = "";
public static string SmtpUser = "";
public static string SmtpPass = "";

/// <summary>
/// 一次性读取配置文件
/// </summary>
public static void LoadConfig()
{
    try
    {
        XmlDocument xml = new XmlDocument();
        string xmlfile = GetXMLPath();
        if (!File.Exists(xmlfile))
        {
            throw new Exception("配置文件不存在，路径：" + xmlfile);
        }
        xml.Load(xmlfile);
        string tmpValue = null;
        //数据库连接字符串
        if (xml.GetElementsByTagName("connstring").Count > 0)
        {
            tmpValue = xml.DocumentElement["connstring"].InnerText.Trim();
            CConfig.ConnString = tmpValue;
        }
        //smtp
        if (xml.GetElementsByTagName("smtpip").Count > 0)
        {
            tmpValue = xml.DocumentElement["smtpip"].InnerText.Trim();
            CConfig.SmtpIp = tmpValue;
        }
        if (xml.GetElementsByTagName("smtpuser").Count > 0)
        {
            tmpValue = xml.DocumentElement["smtpuser"].InnerText.Trim();
            CConfig.SmtpUser = tmpValue;
        }
        if (xml.GetElementsByTagName("smtppass").Count > 0)
        {
            tmpValue = xml.DocumentElement["smtppass"].InnerText.Trim();
            CConfig.SmtpPass = tmpValue;
        }
    }
    catch (Exception ex)
    {
        CConfig.SaveLog("CConfig.LoadConfig() fail,error:" + ex.Message);
        Environment.Exit(-1);
    }
}