How to update app settings key value pair dynamically on app.config file in c# winforms

Question

How to update app settings key, value dynamically on app.config file in c# winforms. Key,value are listed below

<appSettings>
    <add key="logPath" value="C:\EventLogs" />
    <add key="isScreenCaptureMode" value="false" />
    <add key="isStartOnSysStartUp" value="false" />
</appSettings>

What about like that: https://stackoverflow.com/a/10900411/1306012 — Bruno Bieri, Mar 27 '18 at 09:59
I'd prefer to use [Application Settings](https://learn.microsoft.com/en-us/dotnet/framework/winforms/advanced/how-to-create-application-settings). You can create it programmatically or using designer. — Reza Aghaei, Mar 27 '18 at 10:00
I have already tried different ways. But the change is reflecting in app.config file. — vijesh, Mar 27 '18 at 10:16
*But the change **is** reflecting in app.config file.* isn't it what you are looking for? — Reza Aghaei, Mar 27 '18 at 10:31

score 12 · Accepted Answer · answered Mar 27 '18 at 12:38

Configuration configuration = ConfigurationManager.
OpenExeConfiguration(Assembly.GetExecutingAssembly().Location);
configuration.AppSettings.Settings["logPath"].Value = DateTime.Now.ToString("yyyy-MM-dd");
configuration.Save();
ConfigurationManager.RefreshSection("appSettings");

score 2 · Answer 2 · answered Mar 27 '18 at 10:39

2

I believe this is what you are looking for:

using System.Configuration;

Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
                config.AppSettings.Settings["isScreenCaptureMode"].Value = "true";
                config.Save(ConfigurationSaveMode.Modified);
                ConfigurationManager.RefreshSection("appSettings");

answered Mar 27 '18 at 10:39

Sabri

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@Sabari I did the same. But the updated value is not reflecting in app.config file. – vijesh Mar 27 '18 at 11:53
@vijesh Note that if you are running/debugging the application from Visual Studio, this will not update the App.Config file. Go to the bin/Debug folder, launch the application from there. Then the values will be updated in the YourApplication.exe XML Configuration file. You can open that file with notepad to view the change. – Sabri Mar 27 '18 at 12:03
@Sabari, I have tried it, but changes were not updating in the file – vijesh Mar 27 '18 at 12:12
I have created this test application for you with the same code I posted above. It is performing the functionality you are asking about.https://quickfileshare.org/6r3/Debug.rar – Sabri Mar 27 '18 at 12:23
Put anything in the textbox, press update. Close the app and then check the WindowsFormsApplication6.exe.config file in notepad. Your value will be there. – Sabri Mar 27 '18 at 12:28
Changing the first line to Configuration configuration = ConfigurationManager. OpenExeConfiguration(Assembly.GetExecutingAssembly().Location); . Its is working. I will update the answer. Thanks for your support bro – vijesh Mar 27 '18 at 12:36

How to update app settings key value pair dynamically on app.config file in c# winforms

2 Answers2

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