access app.config file from class library

Question

5.00/5 (1 vote)

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Hello,
I have a class library in Visual studio solution, i have added app.confing file in
class library

XML

<configuration>
  <appSettings>
    <add key="ConnectionString" value="Server=ServerName; Database=DbNAme; UID=uid; password=password"/>
  </appSettings>
</configuration>

now i want to access ConnectionString from class library, how can i access it?
(this doesnt work for class library - ConfigurationManager.AppSettings["ConnectionString"];)

Posted 28-Dec-11 23:32pm

niravsahayata

Updated 14-Nov-17 2:14am

Mehdi Gholam

v2

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#realJSOP · Answer 1 · 2011-12-28T23:58:00

Solution 1

Why don't you pass your app's Settings object to the class in the class library?

Posted 28-Dec-11 23:58pm

#realJSOP

Comments

Wendelius 29-Dec-11 6:03am

Simple and feasible, 5.

Rhys Gravell · Answer 2 · 2011-12-29T04:42:00

I would guess it's not accessible from your class library as the class library doesn't reference the System.configuration component. Make sure this is referenced by your class library.

Also, depending on the version of .Net you are using, you can add a connection string directly to the connectionStrings element of your config file and access it using ConfigurationManager.ConnectionStrings["ConnectionStringName"].ConnectionString rather than the obsolete ConfigurationSettings.AppSettings method.

NandaKumer · Answer 3 · 2011-12-29T10:09:00

Solution 6

check these blogs
http://www.pcreview.co.uk/forums/read-application-config-file-class-library-t3830284.html[^]
http://stackoverflow.com/questions/1318423/access-app-config-settings-from-class-library-called-through-unit-test-project[^]
--NDK

Posted 29-Dec-11 10:09am

NandaKumer

mayankshrivastava · Answer 4 · 2011-12-29T04:52:00

Solution 4

try a configurationSetting

C#

System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"];

Posted 29-Dec-11 4:52am

mayankshrivastava

Updated 29-Dec-11 8:36am

v3

Comments

niravsahayata 29-Dec-11 12:09pm

i am using same syntax now..,but using this syntax i can access config file of solution, i cant access confing file for class library.
follow this link..http://stackoverflow.com/questions/435261/asp-net-solution-with-class-library-project

Espen Harlinn 30-Dec-11 9:10am

5'ed!

nishantcomp2512 · Answer 5 · 2011-12-29T00:07:00

Solution 2

try a configurationSetting

C#

System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"];

Posted 29-Dec-11 0:07am

nishantcomp2512

Comments

niravsahayata 29-Dec-11 6:30am

this will not work for class library(i have already describes this in question)

niravsahayata · Answer 6 · 2011-12-29T06:07:00

Solution 5

this works for me

Posted 29-Dec-11 6:07am

niravsahayata

Comments

rohit24c 21-Aug-13 5:56am

If u add a Key/Value pair in AppConfig and if its a WebApp then donot forget to add it in webConfig file.
As the webconfig overrides all the value in appconfig.

ZurdoDev · Answer 7 · 2013-09-27T07:25:00

Solution 8

It will work but it has to be in the config file for whatever is hosting your dll. For example, if your dll is used in a asp.net site you would need to add it to the site's web.config.

Posted 27-Sep-13 7:25am

ZurdoDev

jhosep50 · Answer 8 · 2017-11-14T02:14:00

Solution 9

all you nee is to select the app.config file and change the follow properties :
Build Action -> Embedded Resource
Copy to output Directory -> Copy if newer

Posted 14-Nov-17 2:14am

jhosep50

Comments

CHill60 14-Nov-17 15:10pm

Question was asked and answered 6 years ago!

access app.config file from class library

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