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Programmatically edit the app.config

Posted on 2009-07-09
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Last Modified: 2012-05-07
I read in some article in the web, that I can edited the app.config through the use of IConfigurationSectionHandler.

Can you please explain to me how it works? I am really lost, I can't understand it...

Please, provide me a detailed explanation.

For example....

This line of code will write to the app.config file.
...

This line of code will loop through all the nodes in the app.config file....
....


Did you get what I mean?

Please, I really need your help...

Joseph....


P.S.

Please don't give me some links to visit, because I already tried those and I can't understand it.




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Question by:JackOfPH
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6 Comments
 
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Expert Comment

by:Dhaest
ID: 24811556
I know that you said no links, but this article explains everything and gives also the coding (and comments what the line does)
Modifying app.config File
http://www.codeproject.com/KB/dotnet/Change_AppConfig_File.aspx

Runtime Web.config / App.config Editing
http://www.eggheadcafe.com/articles/20030907.asp
    Public Shared Sub UpdateAppSettings_
        (ByVal KeyName As String, ByVal KeyValue As String)
    '  AppDomain.CurrentDomain.SetupInformation.ConfigurationFile 
    ' This will get the app.config file path from Current application Domain
        Dim XmlDoc As New XmlDocument()
    ' Load XML Document
       XmlDoc.Load(AppDomain.CurrentDomain.SetupInformation.ConfigurationFile)
    ' Navigate Each XML Element of app.Config file
        For Each xElement As XmlElement In XmlDoc.DocumentElement
            If xElement.Name = "appSettings" Then
                ' Loop each node of appSettings Element 
                ' xNode.Attributes(0).Value , Mean First Attributes of Node , 
                ' KeyName Portion
                ' xNode.Attributes(1).Value , Mean Second Attributes of Node,
                ' KeyValue Portion
                 For Each xNode As XmlNode In xElement.ChildNodes
                    If xNode.Attributes(0).Value = KeyName Then
                        xNode.Attributes(1).Value = KeyValue
                    End If
                Next
            End If
        Next
        ' Save app.config file
        XmlDoc.Save(AppDomain.CurrentDomain.SetupInformation.ConfigurationFile)
    End Sub

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Author Comment

by:JackOfPH
ID: 24811594
Both example does not use IConfigurationSectionHandler?
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Expert Comment

by:Dhaest
ID: 24811604
You can edit it directly through xml :)
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LVL 15

Author Comment

by:JackOfPH
ID: 24811628
Yes, but what I want to do is edit it through IConfigurationSectionHandler...
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Accepted Solution

by:
Dhaest earned 500 total points
ID: 24811735
I can't help you any further than, because I did it with xml. (although I don't find it very good to create/update/delete something in the app.config in runtime)

Understanding Section Handlers - App.config File
By Palanisamy Veerasingam
This article explains configuration section handlers defined in the System.Configuration namespace and explains how to create custom sections handlers by implemeting the IConfigurationSectionHandler interface.
http://www.codeproject.com/KB/aspnet/ConfigSections.aspx?display=Print
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LVL 15

Author Comment

by:JackOfPH
ID: 24811752
ok, lets try it your way....

How can I add new element? to the app.config file?


I tried this code but no luck...
Public Shared Sub UpdateSetting(ByVal Keyname As String, ByVal keyvalue As String)
        Dim xmlDoc As New XmlDocument
 
        xmlDoc.Load(AppDomain.CurrentDomain.SetupInformation.ConfigurationFile)
 
        Dim xmlNode1 As XmlNode = xmlDoc.CreateNode(XmlNodeType.Element, "Joseph", "test")
        xmlNode1.InnerText = "Ocena"
        xmlDoc.AppendChild(xmlNode1)
        xmlDoc.Save(AppDomain.CurrentDomain.SetupInformation.ConfigurationFile)
    End Sub

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