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03.29.2008 at 05:21PM PDT, ID: 23280108

	[x] Attachment Details

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9.1

Saving to App.Config

Zones: .Net Editors & IDEs, Microsoft Visual C#.Net, .NET Framework 3.x versions

Tags: C#, VS 2008 Pro

I've been reading all sort of questions about writing to the app.config file and yet have not found a good answer that will show me how to accomplish that. I am usinf framework 3.5 and visual studio 2008 and I need to change some values in my config file through a windows form. I don't want to creat another xml file. is there a way to save to the app.config file?

thanks a lot

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Question Stats

Zone: Programming

Question Asked By: smaguire

Solution Provided By: p_davis

Participating Experts: 2

Solution Grade: A

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03.30.2008 at 11:27AM PDT, ID: 21241472

Rank: Wizard

jaime_olivares:

config file is saved automatically, just you have to edit the "settings" variables.
in your solution explorer, look at the Properties node, then dobule click the "settings.settings" node.
Insert variables there, there are 2 kind of "scopes" for each variable.
Aplication scope define readonly variables
User scope define read/write variables.
Both will be stored automatically.

To read or write a setting variable, use something like:

Properties.Settings.Default.varnamehere

03.30.2008 at 07:41PM PDT, ID: 21242862

Rank: Guru

p_davis:

here is an example of how to save some value from a textbox text value to your config file

                       
         
           
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             //class members
 
ExeConfigurationFileMap fileMap = new ExeConfigurationFileMap();
KeyValueConfigurationElement kvce;
Configuration config;
 
//constructor
public Form1()
{
  InitializeComponent();
  fileMap.ExeConfigFilename = fileMap.ExeConfigFilename = @"path_to_your_file";
  config = configurationManager.OpenMappedExeConfiguration(fileMap, ConfigurationUserLevel.None) as Configruation;
 
//get some value from a key value in the configuration file...
txtSomeTextBoxValue.Text = config.AppSettings.Settings["someKeyVariable"].Value.ToString();
}
 
private void button_Click(object sender, EventArgs e)
{
   kvce.value = txtSomeTextBoxValue.Text;
   //save value of textbox back to the config file....
   config.Save(ConfigurationSaveMode.Minimal, true);
}
}

           
         

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03.31.2008 at 09:46AM PDT, ID: 21247025

smaguire:

thank you guys for your reply,
p_davis, when i am trying to assign value to kvcs.Vaue i get the following error:
"Object reference not set to an instance of an object." and i create the line above it, which allows me to retrieve value from my config file just fine, so it must have been initialized, i don't know why i am getting this error.
the following line worked for me:
txtSomeTextBoxValue.Text = config.AppSettings.Settings["someKeyVariable"].Value.ToString();

PS:
in your code:
kvce.value = txtSomeTextBoxValue.Text;
how does the kvce value know to which appSetting variable will it save to? I mean my appSetting will have something like:
AppSettings.Settings["someKeyVariable1"].
AppSettings.Settings["someKeyVariable2"].
AppSettings.Settings["someKeyVariable3"].

and you say: kvce.value = txtSomeTextBoxValue.Text;
will you be assign the kvce value to someKeyVariable1 or someKeyVariable2 or ..etc

thank you for your help

I am raising the points to 250

03.31.2008 at 10:05AM PDT, ID: 21247190

Rank: Guru

p_davis:

kvce = config.AppSettings.Settings["someKeyVariable"];

sorry forgot to add this to the form load event

03.31.2008 at 10:21AM PDT, ID: 21247318

smaguire:

thanks davis, we are almost there,
two questions:
1- I guess when in run mode the app file becomes app.exe.config and when in solution its app.config? is that why the results show only in app.exe.config?
2- if i have more than one AppSettings variable should i create the following:
kvce1 = config.AppSettings.Settings["someKeyVariable1"];
kvce2 = config.AppSettings.Settings["someKeyVariable2"];
... etc ?

thanks again

03.31.2008 at 10:27AM PDT, ID: 21247356

Rank: Guru

p_davis:

1. to effect the program when running you do need to modify the app.exe.config. this is what the program uses.
2. yes

Accepted Solution

20080236-EE-VQP-29 / EE_QW_2_20070628