i don t like using built in method Configuration.AppSettings since it only
provides read method not write so i use something i found and made. this
reads and writes bo config files.
I don t have 2005 so i can t help you with your specific problem but i am
including my class i use for application settings read/write.
hope this helps and pass it along to others if you wish :)
using System;
using System.Xml;
using System.Reflection;
using System.Configuration;
using System.Windows.Forms;
using System.Collections;
namespace SOMENAMESPACE
{
#region AppSettings Class
/// <summary>
/// Summary description for AppSettings.
/// </summary>
///<app.config>
///
///<?xml version="1.0" encoding="utf-8" ?>
///<configuration>
///<appSettings>
///<add key="ircroom" value="#jami"/>
///<add key="server" value="lucky"/>
///<add key="port" value="6667"/>
///</appSettings>
///</configuration>
///</app.config>
///<example>
///
///AppSettings app = new
AppSettings(((Assembly.GetEntryAssembly()).GetName ()).Name+".exe.config");
///mIRCRoom = app.GetValue("//appSettings//add[@key='ircroom']"); //reads
///mServer = app.GetValue("//appSettings//add[@key='server']"); //reads
///app.SetValue("//appSettings//add[@key='port']"
///
///</example>
///
public class AppSettings : System.Configuration.AppSettingsReader
{
#region Variable Declarations
#region Private Variables
/// <summary> xmlnode</summary>
private XmlNode mXmlNode;
/// <summary> config file name</summary>
private string mConfigFile;
#endregion
#endregion
#region Constructor
/// <summary>
/// appsetting reads and writes to any given xml file
/// pass the xml file name in
/// </summary>
/// <param name="file">xml file name to read from and write to</param>
/// <example> to read or write to the following key
/// "<appSettings><add key="ircroom" value="#jami"/></appSettings>
/// use //appSettings//add[@key='ircroom']
///
///</example>
public AppSettings(string file)
{
ConfigFileName = Application.StartupPath+"\\"+file;
}
#endregion
#region Public Methods
/// <summary>
/// gets key as an xml object, converts to string and reutrns the string
/// </summary>
/// <param name="key"></param>
/// <returns>string key</returns>
public string GetValue(string key)
{
return Convert.ToString(GetValue(key,typeof(string)));
}
/// <summary>
/// takes key and type of the string, ie.string, bool, int, double,DateTime
/// </summary>
/// <param name="key"></param>
/// <param name="sType"></param>
/// <returns>convert value to given type parameter and returns an
object</returns>
public new object GetValue(string key, System.Type sType)
{
XmlDocument doc = new XmlDocument();
object ro = String.Empty;
LoadConfigFile(doc);
string sNode = key.Substring(0, key.LastIndexOf("//"));
try
{
mXmlNode = doc.SelectSingleNode(sNode);
if(mXmlNode != null)
{
XmlElement targetElement =
(XmlElement)mXmlNode.SelectSingleNode(key.Replace( sNode,""));
if(targetElement != null)
{
ro = targetElement.GetAttribute("value");
}
}
if(sType == typeof(string))
{
return Convert.ToString(ro);
}
else if(sType == typeof(bool))
{
if(ro.Equals("True") || ro.Equals("False"))
return Convert.ToBoolean(ro);
else
return false;
}
else if(sType == typeof(int))
{
return Convert.ToInt32(ro);
}
else if(sType == typeof(double))
{
return Convert.ToDouble(ro);
}
else if(sType == typeof(DateTime))
{
return Convert.ToDateTime(ro);
}
else
return Convert.ToString(ro);
}
catch(Exception ex)
{
MessageBox.Show(ex.Message);
return String.Empty;
}
}
/// <summary>
/// sets value of given key val pair
/// if it does not exisist it will create one
/// </summary>
/// <param name="key"></param>
/// <param name="val"></param>
/// <returns>boolean indicating success or failure</returns>
/// <example>settings.SetValue("//RoomSettings//add[@key='port']",
</example>
public bool SetValue(string key, string val)
{
XmlDocument doc = new XmlDocument();
LoadConfigFile(doc);
try
{
//configuration
string sNode = key.Substring(0, key.LastIndexOf("//"));
mXmlNode = doc.SelectSingleNode(sNode);
if(mXmlNode == null) return false;
XmlElement targetElement = (XmlElement)
mXmlNode.SelectSingleNode(key.Replace(sNode, null));
if(targetElement != null)
{//element found so set it
targetElement.SetAttribute("value", val);
}
else //create a new element
{
//add[@key='room']
sNode = key.Substring(key.LastIndexOf("//")+ 2);
//create new element add
XmlElement entry =
doc.CreateElement(sNode.Substring(0,sNode.IndexOf( "[@")).Trim());
sNode = sNode.Substring(sNode.IndexOf("'")+1);
//set attribute key=yyy
entry.SetAttribute("key",sNode.Substring(0,sNode.I ndexOf("'")));
//set attribute value=val
entry.SetAttribute("value",val);
mXmlNode.AppendChild(entry);
}
SaveConfigFile(doc,mConfigFile);
return true;
}
catch{ return false; }
}
/// <summary>
/// removes give key and its value
/// </summary>
/// <param name="key"></param>
/// <returns>returns boolean value indicating success or failure</returns>
public bool removeElement (string key)
{
XmlDocument doc = new XmlDocument();
LoadConfigFile(doc);
try
{
string sNode = key.Substring(0, key.LastIndexOf("//"));
// retrieve the appSettings node
mXmlNode = doc.SelectSingleNode("//appSettings");
if( mXmlNode == null )
return false;
// XPath select setting element that contains the key to remove
mXmlNode.RemoveChild( mXmlNode.SelectSingleNode(key.Replace(sNode,"")) );
SaveConfigFile (doc, mConfigFile);
return true;
}
catch
{
return false;
}
}
#endregion
#region Private Methods
/// <summary>
/// Loads xml document that is myprog.exe.config
/// </summary>
/// <param name="doc"></param>
private void LoadConfigFile(XmlDocument doc)
{
try
{
doc.Load(mConfigFile);
}
catch(XmlException ex)
{
System.Diagnostics.Debug.WriteLine(ex.Message);
}
catch(Exception ex)
{
System.Diagnostics.Debug.WriteLine(ex.Message);
}
}
/// <summary>
/// saves config gile
/// </summary>
/// <param name="doc">document to save</param>
/// <param name="docPath">document path where to save</param>
private void SaveConfigFile(XmlDocument doc, string docPath)
{
try
{
XmlTextWriter writer = new XmlTextWriter(docPath, null);
writer.Formatting = Formatting.Indented;
doc.WriteTo( writer );
writer.Flush();
writer.Close();
return;
}
catch
{
}
}
#endregion
#region Public Properties
/// <summary>
/// returns or set config file name
/// </summary>
public string ConfigFileName
{
get
{
return mConfigFile;
}
set
{
mConfigFile = value;
}
}
#endregion
}
#endregion
}
