Modify and obtain the value attribute function in Add in the configuration section of the appSettings of the web. config or app. config file.

   1:  /// <summary>

2: // modify the value Attribute in Add in the appSettings configuration section of the web. config or app. config file.

   3:  /// </summary>

   4:  /// <remarks>

5: // Note: after calling this function, the entire Web Application will be restarted, resulting in the loss of all sessions currently.

   6:  /// </remarks>

7: // <param name = "key"> key to be modified </param>

8: // <param name = "strValue"> modified value </param>

9: // <exception cref = ""> the related key cannot be found. </exception>

10: // <exception cref = ""> the permission is insufficient and cannot be saved to the web. config file. </exception>

  11:  public static void ModifyAppSettings(string key, string strValue)

  12:  {

  13:      string XPath = "/configuration/appSettings/add[@key='?']";

  14:      XmlDocument domConfig = new XmlDocument();

  15:   

  16:      domConfig.Load(Environment.CurrentDirectory + "/Application1.exe.config");

  17:      XmlNode addKey = domConfig.SelectSingleNode((XPath.Replace("?", key)));

  18:      if (addKey == null)

  19:      {

20: throw new ArgumentException ("configuration section of <add key = '" + key + "'value =.../> not found ");

  21:      }

  22:      addKey.Attributes["value"].InnerText = strValue;

  23:      domConfig.Save(Environment.CurrentDirectory + "/Application1.exe.config");

  24:   

  25:  }

  26:   

  27:  /// <summary>

28: // obtain the value attribute in Add in the appSettings configuration section of the web. config or app. config file.

  29:  /// </summary>

30: /// <param name = "key"> key to be modified </param>

31: // <param name = "strValue"> modified value </param>

32: // <exception cref = ""> the related key cannot be found. </exception>

33: // <exception cref = ""> the permission is insufficient and cannot be saved to the web. config file. </exception>

  34:  public static string GetAppSettings(string key)

  35:  {

  36:      string XPath = "/configuration/appSettings/add[@key='?']";

  37:      XmlDocument domConfig = new XmlDocument();

  38:   

  39:      domConfig.Load(Environment.CurrentDirectory + "/Application1.exe.config");

  40:      XmlNode addKey = domConfig.SelectSingleNode((XPath.Replace("?", key)));

  41:      if (addKey == null)

  42:      {

43: throw new ArgumentException ("configuration section of <add key = '" + key + "'value =.../> not found ");

  44:      }

  45:      return addKey.Attributes["value"].InnerText;

  46:  }