I want to save some of my programs variables to a config.file.
So, I try to use "AppConfig ", as that almost seems to be the standard.
Before trying anything complicated, I put it to the test in a;
as simple as possible program. (and a variety of variations)
But I keep getting this error:System.NullReferenceException:
'Object reference not set to an instance of an object.'
(Visual Basic)(Visual Studio 2022) (Net.6)
In the line: _settings.Settings.Item(propertyName).Value = propertyValue
As per instruction I referenced :System.Configuration, And imported System.Configuration and System.Reflection
I try to save one variable "atest" and its data "bey".
So, why doesn't this work?
All the code:
Imports System.Configuration
Imports System.Reflection
Public Class Form1
Sub New()
Dim test As String = "bey"
' This call is required by the designer.
InitializeComponent()
Dim _appConfig As New AppConfig
_appConfig.SetProperty("test", "dd")
End Sub
End Class
Public Class AppConfig
Private _config As Configuration
Private _settings As AppSettingsSection
Public Function GetProperty(propertyName As String) As String
Return _settings.Settings.Item(propertyName).Value
End Function
Public Sub SetProperty(propertyName As String, propertyValue As String)
_settings.Settings.Item(propertyName).Value = propertyValue
End Sub
Public Sub New()
_config = ConfigurationManager.OpenExeConfiguration(Assembly.GetEntryAssembly().Location)
_settings = _config.AppSettings
End Sub
Protected Overrides Sub Finalize()
MyBase.Finalize()
_config.Save(ConfigurationSaveMode.Modified)
End Sub
End Class
Thanks in advance for any help...
I will probably feel very stupid if the solution is very simple...
P.S. The code is almost literary all from this Blog..
Update 1!
I did a U-turn as I found that there is an in-build function
that would be even more simple.
That resulted in more errors..
But eventually lead to half a solution.
Please change channels to that thread, as this one seems to be redundant.
