/// <summary>
/// 功能： 读取应用程序exe.config文件中
/// appSettings节点下 节点add属性值
/// 根据add的属性值key来读取value值
/// </summary>
/// <param name="appKey">属性key值</param>
/// <returns></returns>
public string GetConfigValue(string appKey)
{
XmlDocument xDoc = new XmlDocument();
try
{
//System.Windows.Forms.Application.ExecutablePath可执行文件路径(包括执行文件名称)
//加载文件
xDoc.Load(System.Windows.Forms.Application.ExecutablePath + ".config");
XmlNode xNode;
XmlElement xElem;
//选取appSettings节点
xNode = xDoc.SelectSingleNode("//appSettings");
//根据key属性值appKey选择节点
xElem = (XmlElement)xNode.SelectSingleNode("//add[@key='" + appKey + "']");
if (xElem != null)
//返回value属性值
return xElem.GetAttribute("value");
else
return "";
}
catch (Exception)
{
return "";
}
}

/// <summary>
/// 功能：动态配置app.config
/// </summary>
/// <param name="AppKey">节点属性key值</param>
/// <param name="AppValue">节点属性value值</param>
private void SetValue(string AppKey, string AppValue)
{
for (int i = 0; i < 2; i++)
{
XmlDocument doc = new XmlDocument();
doc.Load(AppConfig(i));
XmlNode node = doc.SelectSingleNode(@"//appSettings");
XmlElement ele = (XmlElement)node.SelectSingleNode(@"//add[@key='" + AppKey + "']");
ele.SetAttribute("value", AppValue);
doc.Save(AppConfig(i));
}
}
/// <summary>
/// 功能：重置数据库connectionStrings连接字符串
/// 时间：2013年12月31日11:09:57
/// </summary>
/// <param name="strKey">节点属性name值</param>
/// <param name="strValue">节点属性connectionString值</param>
/// <returns></returns>
private void WriteXml(string strKey, string strValue)
{
//循环2次
//分别修改App.config及应用程序exe.config connectionStrings节点值
for (int i = 0; i < 2; i++)
{
XmlDocument doc = new XmlDocument();
doc.Load(AppConfig(i));
XmlNode node = doc.SelectSingleNode(@"//connectionStrings");
XmlElement ele = (XmlElement)node.SelectSingleNode(@"//add[@name='" + strKey + "']");
ele.SetAttribute("connectionString", strValue);
doc.Save(AppConfig(i));//保存
}
}

/// <summary>
/// 功能：获取配置文件路径
/// </summary>
/// <param name="i"></param>
/// <returns></returns>
public string AppConfig(int i)
{
if (i == 0)//获取应用程序目录下App.config路径
{
int intPos = Application.StartupPath.Trim().IndexOf("bin") - 1;
string strDirectoryPath = System.IO.Path.Combine(Application.StartupPath.Substring(0, intPos), "App.config");
return strDirectoryPath;
}
else//获取应用程序exe目录 如：MultiThreadDemo.exe.config目录路径
{
return System.Windows.Forms.Application.ExecutablePath + ".config";
}
}