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02.25.2008 at 10:11PM PST, ID: 23192659
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VB.NET Application Settings: read only needs to be read/write
Tags: VB.NET
Still coming up to speed on VB.NET 2005 from VB6. In VB.NET, you can use the application settings to store app info. Problem is, in the IDE, its a read only attribute. Yes, you can use User Settings that are both read/write, but the problem with user settings is that they're specific to the user logged on to Windows. I have a number of global variables that are specific to a PC that need to be configured at run time. In the setup areas of my apps I have things like mapped drives, output text file names and extensions, which boxes are checked/unchecked in a form etc. etc. In my VB6 days, I used to use INI files to hold this data. In VB.NET, it looks like application and user settings are the way to go. Writing my own class based on the applicationsettingbase can be done, but looks time consuming on the learning curve. What is everyone doing on this score and what are the best practices for this. I have included two methods to read and write to the app.config file for the exe. It works, but it's kinda lame (it can bomb if its missiing a key in the file). I would like to know what the experts are doing on this for reading/writing app data.

Thanks,

Ken
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mports System
Imports System.Collections.Specialized
Imports System.Collections.ObjectModel
Imports System.Collections
Imports System.Text
Imports System.Configuration
 
Class AppSettings
 
'glo is a globalUDT created in a mod in my project, it's  a constuct of my apps global vars
Shared Sub UpdateAppSettings()
        ' Get the configuration file.
        Dim config As System.Configuration.Configuration = _
        ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None)
 
        ' Add an entry to appSettings.
        Dim newKey As String
        Dim newValue As String
 
        config.AppSettings.Settings.Clear()
 
        newKey = "DriveLetter"
        newValue = glo.DriverLetter
        config.AppSettings.Settings.Add(newKey, newValue)
 
        newKey = "LastDateProcessed"
        newValue = glo.LastDateProcesses
        config.AppSettings.Settings.Add(newKey, newValue)
 
        ' Save the configuration file.
        config.Save(ConfigurationSaveMode.Modified)
 
        ' Force a reload of the changed section.
        'ConfigurationManager.RefreshSection("appSettings")
 
    End Sub 'UpdateAppSettings
 
    ' Show how to use OpenExeConfiguration(string).
    Public Sub LoadAppSettings()
 
        Dim exePath As String = System.IO.Path.Combine( _
        Environment.CurrentDirectory, "DBTrans.exe")
 
        ' Get the configuration file.
        Dim config As System.Configuration.Configuration = _
        ConfigurationManager.OpenExeConfiguration(exePath)
 
        ' Get the AppSetins section.
        Dim appSettingSection As AppSettingsSection = _
        CType(config.GetSection("appSettings"), AppSettingsSection)
 
        Dim appSettings As NameValueCollection = _
        ConfigurationManager.AppSettings
 
        glo.PosDriverLetter = appSettings.Get("DriveLetter")
        glo.LastDateProcesses = CType(appSettings.Get("LastDateProcessed"), Date)
 
 
    End Sub
End Class
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Question Stats
Zone: Programming
Question Asked By: ken1010
Solution Provided By: emoreau
Participating Experts: 2
Solution Grade: A
Views: 316
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02.26.2008 at 02:34AM PST, ID: 20982984

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02.26.2008 at 02:56AM PST, ID: 20983078

Rank: Sage

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02.26.2008 at 07:17AM PST, ID: 20985010

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02.26.2008 at 07:54AM PST, ID: 20985395

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02.26.2008 at 02:34AM PST, ID: 20982984
Your way would be ok and I'm not sure how the experts do it but,

In vb 2005 you can now use the My namespace.
Syntax is My.Settings.Item("abc") = "123" to set
Dim strAbc as String = My.Settings.Item("abc") to retrieve.

You can set these up viewing all folders in solution explorer, clicking on the My Project folder then Settings. As long as the key exists in the app.config file it will work ok.

Hope this helps.
 
02.26.2008 at 02:56AM PST, ID: 20983078
 
02.26.2008 at 07:17AM PST, ID: 20985010
emoreau,
Thanks for the good article. While informative, it does not address my question. What is a good method of reading and writing values for an application that are specific to a machine and not the user and that must be changed at run time? I am baffled that this has not been addressed by Microsoft in the application settings (i.e. read only). As I mentioned, in my apps I have setup areas that must be configured and saved at run time. These configuration settings must NOT be specific to a user, but to the PC. In the past I have used INI files for this. It appears for now, that I must continue to use INI files for these variables. Yes I can use the app settings for the read only portions of my app settings and the user settings for the specific user preference settings, but for read/write runtime variables, looks like the old INI file might be the only answer. Seems pretty crude with all the elegance of VB.NET. Any thoughts on this?

Ken
 
02.26.2008 at 07:54AM PST, ID: 20985395

Rank: Sage

you are right, MS does not address it (probably for security reasons). but don't forget that config file is nothing else then a XML file and nothing stops you from editing it. see my first article: http://www.emoreau.com/Entries/Articles/2003/05/Applications-Settings-in-VBNet.aspx
Accepted Solution
 
 
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