CODEWITHSUNDEEP
vb.netwindows-servicesapplication-settings
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Reputation: 453

Default values are being used for My.Settings instead of those in the app.config (for a Windows service)

A Windows service written in VB.NET is using the My.Settings namespace for simplicity. There are only three settings to read, and these are read within the constructor of the ServiceLauncher.

I am attempting to install the service as such:

installutil GID.ServiceLauncher.exe

And this is successful, however the config settings it is using are not the ones within the GID.ServiceLauncher.exe.config file, instead it is using the ones baked into the app as Default Settings within Settings.Designer.vb (marked with DefaultSettingValueAttribute). [The questionable wisdom of Microsoft not allowing a developer to ignore default settings is another question entirely].

How can I further diagnose this issue, and maybe force a reload of settings? I tried calling My.Settings.Default.Reload, however this did nothing. All settings are application settings, and only differ by "value" from those in the auto generated file.

I have successfully attached the debugger using System.Diagnostics.Debugger.Launch() and true enough, the settings are still the default settings.

In anticipation of the question, the background: The reason for requiring configuration settings is because this is a very straightforward service that simply executes an exe; and this exe is in configurable location. There are other reasons also, such as I wish to have the service name configurable without recompiling.

Upvotes: 1

Views: 4015

Answers (3)

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Reputation: 453

I discovered that because the installer runs in the same process as InstallUtil.exe the config file is never found for a Windows Service. Similar article here on msdn

Therefore I rolled my own simple solution inspired by this. See below for new code: 

Friend Function GetConfigurationValue(ByVal key As String) As String
    Dim service = System.Reflection.Assembly.GetAssembly(GetType(ProjectInstaller))
    Dim config As Configuration = ConfigurationManager.OpenExeConfiguration(service.Location)
    Dim keyValue As String = config.AppSettings.Settings(key).Value

    If String.IsNullOrEmpty(keyValue) Then
        Throw New IndexOutOfRangeException(String.Format("Settings collection does not contain the requested key:[{0}]", key))
    End If

    Return keyValue
End Function

Alternative solutions:

Passing parameters in to InstallUtil
Daenibuq (another abstraction on wrapping System.ServiceProcess)

Upvotes: 1

Geoff Appleford
Geoff Appleford

Reputation: 18832

Have you manually changed the settings in the app.config file. If so, these changes will only be picked up if they are Application settings - not User settings.

So the easy fix is to change your settings scope to Application.

Update

Check your file access permissions. Does the account that the service is running under have permission to access the config file? See this related SO answer

Upvotes: 0

Hans Olsson
Hans Olsson

Reputation: 55059

When you're accessing the settings do you write My.Settings.Default.MySetting? If so, try changing that to My.Settings.MySetting.

Upvotes: 0

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