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DLL with configuration file

, 22 May 2011
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Using configuration files in DLL is not trivial, but is very simple.
Using configuration files in DLL is not trivial.
To accomplish this, we must follow these steps:
  • Add a reference to System.Configuration
  • Add a new Application Configuration File and the name it [Your project].dll.config
  • Change the BuildAction property of the config file to Content
  • Change the Copy to Output property to "Copy Always"
 
After these steps, you can access the configuration file this way:
//Open the configuration file using the dll location
Configuration myDllConfig = 
       ConfigurationManager.OpenExeConfiguration(this.GetType().Assembly.Location);
// Get the appSettings section
AppSettingsSection myDllConfigAppSettings = 
       (AppSettingsSection)myDllConfig.GetSection("appSettings");
// return the desired field 
return myDllConfigAppSettings.Settings["MyAppSettingsKey"].Value; 
 
Your configuration file should look like this:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <appSettings>
    <add key ="MyAppSettingsKey" value="MyValue"/>
  </appSettings>
</configuration>
 
That's all. Hope you enjoy this tip.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

fmsalmeida

Brazil Brazil
I'm a Brazilian senior system analyst and team leader and I live in Dublin, Ireland. I've been working with software development since 1996.

Comments and Discussions

 
QuestionThanks for the straight-to-the-point instructions, it helped me a lot! PinmemberMember 124954625-May-14 5:20 
QuestionNot working when updating config file values Pinmemberxyz from Bangalore20-Oct-13 18:50 
GeneralMy vote of 5 Pinmemberremi22211-Jul-13 7:27 
QuestionNot work in WebApplication [modified] PinmemberMlsoun1-Oct-12 2:04 
AnswerRe: Not work in WebApplication PinmemberFregate19-Feb-13 16:03 
GeneralRe: Not work in WebApplication Pinmemberfmsalmeida20-Feb-13 0:12 
GeneralRe: Not work in WebApplication PinmemberFregate20-Feb-13 12:15 
GeneralRe: Not work in WebApplication Pinmembereng_george128-Jan-14 1:30 
QuestionVS10 Saves Setting to Project.dll.config PinmemberMember 462571327-Mar-12 5:24 
GeneralReason for my vote of 5 This solved a problem that I've been... Pinmemberjtdavies8-Feb-12 8:54 
Reason for my vote of 5
This solved a problem that I've been wrestling with for the last few hours. I wanted to add app.config to my Nunit test dll.
GeneralReason for my vote of 5 Nice, I like it, and I am bookmarkin... PinmemberFDW3-Nov-11 1:06 
GeneralReason for my vote of 5 It is very good :) PinmemberCaner Korkmaz23-Aug-11 0:14 
GeneralReason for my vote of 5 Bookmarked for future ref. PinmemberKeithAMS2-Jun-11 22:40 
QuestionPossible in .NET 1.1? PinmemberKeithAMS27-Oct-11 23:28 
AnswerRe: Possible in .NET 1.1? Pinmemberfmsalmeida28-Oct-11 3:18 
GeneralGood Tip PinmemberKeithAMS2-Jun-11 22:40 
GeneralRe: Good Tip Pinmemberfmsalmeida3-Jun-11 2:32 
GeneralExplain why.... PinmemberEngleA27-May-11 3:28 
GeneralRe: Explain why.... Pinmemberfmsalmeida27-May-11 4:16 
QuestionToo complex? PinmemberRiz Thon23-May-11 20:03 
AnswerRe: Too complex? Pinmemberfmsalmeida24-May-11 4:10 

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