<?xmlversionxmlversion="1.0"encoding="utf-8" ?>
<configuration>
</configuration>

<!--数据库连接串--> <connectionStrings> <clear /> <addnameaddname="conJxcBook" connectionString="Data Source=localhost;Initial Catalog=jxcbook;User ID=sa;password=********" providerName="System.Data.SqlClient" /> </connectionStrings>

<!--进销存管理系统初始化需要的参数--> <appSettings> <clear /> <addkeyaddkey="userName"value="" /> <addkeyaddkey="password"value="" /> <addkeyaddkey="Department"value="" /> <addkeyaddkey="returnValue"value="" /> <addkeyaddkey="pwdPattern"value="" /> <addkeyaddkey="userPattern"value="" />
</appSettings> 

///<summary>
///依据连接串名字connectionName返回数据连接字符串
///</summary>
///<param name="connectionName"></param>
///<returns></returns>
private static string GetConnectionStringsConfig(string connectionName)
{  string connectionString =  ConfigurationManager.ConnectionStrings[connectionName].ConnectionString.ToString();  Console.WriteLine(connectionString);  return connectionString;
} 

///<summary>
///更新连接字符串
///</summary>
///<param name="newName">连接字符串名称</param>
///<param name="newConString">连接字符串内容</param>
///<param name="newProviderName">数据提供程序名称</param>
private static void UpdateConnectionStringsConfig(string newName, string newConString, string newProviderName)
{  bool isModified = false;    //记录该连接串是否已经存在  //如果要更改的连接串已经存在  if (ConfigurationManager.ConnectionStrings[newName] != null)  {  isModified = true;  } //新建一个连接字符串实例  ConnectionStringSettings mySettings = new ConnectionStringSettings(newName, newConString, newProviderName);  // 打开可执行的配置文件*.exe.config  Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);  // 如果连接串已存在，首先删除它  if (isModified)  {  config.ConnectionStrings.ConnectionStrings.Remove(newName);  }  // 将新的连接串添加到配置文件中.
    config.ConnectionStrings.ConnectionStrings.Add(mySettings);  // 保存对配置文件所作的更改
    config.Save(ConfigurationSaveMode.Modified);  // 强制重新载入配置文件的ConnectionStrings配置节  ConfigurationManager.RefreshSection("ConnectionStrings");
} 

///<summary>
///返回＊.exe.config文件中appSettings配置节的value项
///</summary>
///<param name="strKey"></param>
///<returns></returns>
private static string GetAppConfig(string strKey)
{  foreach (string key in ConfigurationManager.AppSettings)  {  if (key == strKey)  {  return ConfigurationManager.AppSettings[strKey];  }  }  return null;
}  

///<summary>
///在＊.exe.config文件中appSettings配置节增加一对键、值对
///</summary>
///<param name="newKey"></param>
///<param name="newValue"></param>
private static void UpdateAppConfig(string newKey, string newValue)
{  bool isModified = false;      foreach (string key in ConfigurationManager.AppSettings)  {  if(key==newKey)  {      isModified = true;  }  }  // Open App.Config of executable  Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);  // You need to remove the old settings object before you can replace it  if (isModified)  {  config.AppSettings.Settings.Remove(newKey);  }   // Add an Application Setting.
    config.AppSettings.Settings.Add(newKey,newValue);  // Save the changes in App.config file.
    config.Save(ConfigurationSaveMode.Modified);  // Force a reload of a changed section.  ConfigurationManager.RefreshSection("appSettings");
}