App Config Modification not reflected in code

问题

I have a appsetting section in appconfig file as

<appSettings>    
  <add key="DayTime" value="08-20"/>
  <add key="NightTime" value="20-08"/>
</appSettings>

I am tyring to modify the app config while application is running. I changed key DayTime to 11-20 while application is running.

Now if I run this code again to fetch data from config, it shows previous set values.

private void btnDayNightSettings_ShowingEditor(object sender, ItemCancelEventArgs e)
{
     string[] strDayTime = ConfigurationManager.AppSettings["DayTime"].Split('-');
}

Why it is so ?

回答1:

The reason behind why the AppSetting section in app.config file is not getting reflected during update in Run time is as follows:

When you add a new app.config file it actually creates a file in the local system.
When you compile it, actually it creates the necessary files including .Exe files in Debug/Release folder; depending upon the Build mode.
After successful build it also generates a .config file which looks like YourApplicationName.exe.config which holds the same entries in original app.config file. And the .Exe always refers to this file.
So whenever you edit the app.config at Runtime it actually updates the file but changes are not updated in YourApplicationName.exe.config file as it has not re-build yet.

So every time you need to re-build to your app to reflect the changes.

回答2:

I have my own answer. Just need to refresh appSettings section as

ConfigurationManager.RefreshSection("appSettings");

回答3:

app.config is cached, the changes will reflect when you restart the application. See is app.config file in WinForms cached by .Net framework?

回答4:

Try this:

string strDayTime = ConfigurationManager.AppSettings["DayTime"];

ConfigurationManager.AppSettings.Set("DayTime", "11-20");

strDayTime = ConfigurationManager.AppSettings["DayTime"];

The value of the strDayTime variables changes on both lines.

来源：https://stackoverflow.com/questions/16855043/app-config-modification-not-reflected-in-code

标签

winforms

app-config