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Posted 20 May 2011

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 = 
// Get the appSettings section
AppSettingsSection myDllConfigAppSettings = 
// return the desired field 
return myDllConfigAppSettings.Settings["MyAppSettingsKey"].Value; 

Your configuration file should look like this:
<?xml version="1.0" encoding="utf-8" ?>
    <add key ="MyAppSettingsKey" value="MyValue"/>

That's all. Hope you enjoy this tip.


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


About the Author

Software Developer (Senior) ResourceKraft
Ireland Ireland
I'm a Brazilian senior system analyst living in Limerick, Ireland. I've been working with software development since 1996.

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Comments and Discussions

GeneralReason for my vote of 5 This solved a problem that I've been... Pin
jtdavies8-Feb-12 8:54
memberjtdavies8-Feb-12 8:54 
GeneralReason for my vote of 5 Nice, I like it, and I am bookmarkin... Pin
FDW3-Nov-11 1:06
memberFDW3-Nov-11 1:06 
GeneralReason for my vote of 5 It is very good :) Pin
Caner Korkmaz23-Aug-11 0:14
memberCaner Korkmaz23-Aug-11 0:14 
GeneralReason for my vote of 5 Bookmarked for future ref. Pin
KeithAMS2-Jun-11 22:40
memberKeithAMS2-Jun-11 22:40 
QuestionPossible in .NET 1.1? Pin
KeithAMS27-Oct-11 23:28
memberKeithAMS27-Oct-11 23:28 
AnswerRe: Possible in .NET 1.1? Pin
fmsalmeida28-Oct-11 3:18
memberfmsalmeida28-Oct-11 3:18 
GeneralGood Tip Pin
KeithAMS2-Jun-11 22:40
memberKeithAMS2-Jun-11 22:40 
GeneralRe: Good Tip Pin
fmsalmeida3-Jun-11 2:32
memberfmsalmeida3-Jun-11 2:32 
I'm glad you like it
thanks for the vote.
GeneralExplain why.... Pin
EngleA27-May-11 3:28
memberEngleA27-May-11 3:28 
GeneralRe: Explain why.... Pin
fmsalmeida27-May-11 4:16
memberfmsalmeida27-May-11 4:16 
QuestionToo complex? Pin
Riz Thon23-May-11 20:03
memberRiz Thon23-May-11 20:03 
AnswerRe: Too complex? Pin
fmsalmeida24-May-11 4:10
memberfmsalmeida24-May-11 4:10 

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