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I have a console application in which I want to write the name of a file.

Process.Start("blah.bat");

Normally, I would have something like that in windows application by writing the name of the file 'blah.bat' to Settings file in Properties.
However, here I didn't find any Settings file and I added an app.config for the same purpose.

I am not sure what to write here in app.config, that would lead to me to achieve similar thing as in Windows Forms.

For eg: In windows forms. Process.Start(Properties.Settings.Default.BatchFile);
where BatchFile is a string in settings file in Properties.

Morse
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user1240679
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3 Answers3

253

You can add a reference to System.Configuration in your project and then:

using System.Configuration;

then

string sValue = ConfigurationManager.AppSettings["BatchFile"];

with an app.config file like this:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
   <appSettings>
       <add key="BatchFile" value="blah.bat" />
   </appSettings>
</configuration>
JohnnyHK
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xxbbcc
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    `ConfigurationSettings.AppSettings["blah.bat"]` is available but gives a warning that this is obsolete. Whenn I try to use `ConfigurationManager` as above, I get an error saying ConfigurationManager does not exist in the current context. :-/ – user1240679 Apr 09 '12 at 06:19
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    Make sure that you also add a reference to System.Configuration - the `using` durective only works when you have a reference to the assembly you're trying to use. – xxbbcc Apr 09 '12 at 13:12
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    late comment but for me my mistake was that I forgot upper-casing 'S' from appSettings –  Apr 01 '19 at 17:45
  • how do I get an int or bool, Ie not a string? – Zapnologica May 06 '20 at 10:54
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    @Zapnologica Everything is a string, as far as `AppSettings` is considered. If you have settings strings that contain numbers, you'll have to parse them by calling `int.TryParse()` or the like. The same goes for any other value that you want to treat something other than a string. – xxbbcc May 06 '20 at 15:06
41

For .NET Core, add System.Configuration.ConfigurationManager from NuGet manager.
And read appSetting from App.config

<appSettings>
  <add key="appSetting1" value="1000" />
</appSettings>

Add System.Configuration.ConfigurationManager from NuGet Manager

enter image description here

ConfigurationManager.AppSettings.Get("appSetting1")
Zin Min
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6

use this 

System.Configuration.ConfigurationSettings.AppSettings.Get("Keyname")
Stefan Ferstl
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user5705992
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    you can save your configuration on appsettion and for Fetch the value use example . – user5705992 Dec 22 '15 at 06:05
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    Provides support for runtime version 1.x. This is [obsolete](https://docs.microsoft.com/en-us/dotnet/api/system.configuration.configurationsettings.appsettings?redirectedfrom=MSDN&view=netframework-4.7.2#System_Configuration_ConfigurationSettings_AppSettings) now. Please use `System.Configuration.ConfigurationManager.AppSettings` – wp78de Aug 17 '18 at 21:11
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    System.Configuration assembly is needed in references. – Muflix Oct 25 '18 at 11:31