Re: appsetting in class doesn't work

Hi steve,
When running it I'm getting an unhandled exception error on line
s = el.Value.ToString() Object reference not set to an instance of an
object. Thats because with the line
el = cnfg.AppSettings.Settings.Item("TestSetting")

el stays at nothing and thats no doubt because my app.config file is using
the new format generated by the settings designer in VS2005 which is as
follows.

<applicationSettings>

<TestClassApConfig.My.MySettings>

<setting name="TestSetting" serializeAs="String">

<value>Testvalue</value>

</setting>

</TestClassApConfig.My.MySettings>

</applicationSettings>

And indeed when I tested it using the old style app.config file
<appSettings>
<add key="TestSetting" value="TestValue"/>
</appSettings>
the code works fine.
The question now becomes, how do you retrieve the TestSetting value when you
created your app config file using the built in tools of VS2005 - creating a
new app.config file with add item-new item- application configuration and
putting application scope settings in the file by using the Myproject -
settings to write settings while developping in the IDE.

Thanks for your help,

Bob




"Steve Long" <Steve_Noneya@xxxxxxxxxx> wrote in message
news:esZh6WbCHHA.3524@xxxxxxxxxxxxxxxxxxxxxxx
Robert, this is my first foray into the configuration system of .NET 2.0
and it seem ridiculously difficult to me but here's how I got the value of
the item that you are trying to retrieve.
First the config file:

<appSettings>

<add key="TestSetting" value="TestValue"/>

</appSettings>

Now the code:

Dim s As String

Dim cnfg As System.Configuration.Configuration

Dim el As KeyValueConfigurationElement

cnfg =
System.Configuration.ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None)

el = cnfg.AppSettings.Settings.Item("TestSetting")

s = el.Value.ToString()

This does indeed return the value that I have "TestValue" in the config
file.

HTH

S

P.S. It seems much easier in VS2003

"Robert Dufour" <bdufour@xxxxxxxxxx> wrote in message
news:eGfK2daCHHA.1012@xxxxxxxxxxxxxxxxxxxxxxx
Here's the class code snippet
Imports System.Configuration.ConfigurationManager

Public Class Class1

Public _strTestSetting As String



Public Sub SetTestsetting()

_strTestSetting = AppSettings.Get("TestSetting") -should get the value of
TestSetting in app config file

End Sub


End Class

This is the snippet in the project calling the class -Project TestIt - To
test you should have a setting named TestSetting application scope, value
Testvalue

Imports System.Configuration

Public Class Form1

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click

Dim mycls As New clsTestconfig.Class1

mycls.SetTestsetting()

Label1.Text = mycls._strTestSetting

End Sub

End Class

There's a setting TestSetting in the settings file of the project Testit

Put a breakpoint on line

_strTestSetting = AppSettings.Get("TestSetting")

Click the button, you will see as you step over the breakpoint that the
value of _strTestSetting stays at nothing. ie, its not picking up the
value of TestSetting in app.config.

How can I get this pickup of the value to work?

Thanks for any help

Bob






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