ConfigurationManager.AppSettings getting null?
C#asp.netWeb ConfigC# Problem Overview
I did not realize that: 'have a web.config in a separate class library and' was reading the web.config app setting from different web application.
I am using VS2010 target framework 3.5
I don't know what is wrong here but I am getting null
when I try to get ConfigurationManager.AppSettings["StoreId"];
private string _storeid = GetStoreId;
public static string GetStoreId
{
get
{
return ConfigurationManager.AppSettings["StoreId"];
}
}
web.config:
<appSettings>
<add key="StoreId" value="123" />
</appSettings>
C# Solutions
Solution 1 - C#
If you are UNIT TESTING you need A COPY of the APP.CONFIG inside the UNIT TEST PROJECT
Solution 2 - C#
Problem
The usual cause for this is due to context.
Cause
When you have a solution with two projects, if the App/Web.Config
is in the main project it wont work if the context of the running application is the second project such as a library, unit test, etc.
Conundrum
To read values from the config in other projects (with System.Configuration
) you'll need to move/copy the config file to the project with the running context. Unfortunately duplicating files defeats the tenants of good programming; OOP, Source Code Management, SOLID, etc.
Cool Solution
A nifty solution is adding config file shortcuts in other projects so you only update one file:
It would be nice to divide the contents of config
files across project's. Elegantly, like Sharing Assembly Files as per answer #2: https://stackoverflow.com/a/15319582/495455 but alas it's by context
Solution 3 - C#
Disclaimer ;) This post is not to answer OP as it is too late but definitely it would help the readers who end up to this page.
Problem I faced : ConfigurationManager.AppSettings["uName"]
returning null
in my C# web api project.
Basic Things I checked for :
1) In code ConfigurationManager.AppSettings["uName"]
, I was using exact key 'uName
' as I had in web.config
file,
i.e
<appSettings>
<add key="uName" value="myValue" />
</appSettings>
Checked that I haven't mis typed as userName
instead of uName
etc.
- Since it is a Web API project it would have a file as
web.config
instead ofapp.config
, and that too in root folder of your project. [refer the image].
Solution :
The solution that worked for me ,
Changed ConfigurationManager.AppSettings["uName"]
to WebConfigurationManager.AppSettings["uName"]
and
made sure that I had
<appSettings>
<add key="uName" value="myValue" />
</appSettings>
in the right file ie.
Right file is not web.config in View folder
neither the debug or release web.config
Solution 4 - C#
and:
<appSettings>
<add key="StoreId" value="123" />
</appSettings>
is located in the web.config
file of your ASP.NET application and not in some app.config
file you've added to your class library project in Visual Studio, right? You can't be possibly getting null
if this is the case. If you've added this to an app.config
of you class library project in Visual Studio then getting null is perfectly normal behavior.
Solution 5 - C#
I just got answer DLL are called from another project not in the project where there are create.so entries in App.config should b move to calling project config file.
For example i have 2 project in my solution one class library and other console application.i have added class library reference in Console application.So if i add app.config file in class library project it through null exception.it works when i added app.config in console application.Hope it works
Solution 6 - C#
App settings are loaded into ConfigurationManager.AppSettings, but User settings (in Properties settings in your project properties) are not.
Solution 7 - C#
I tried all of these solutions but none worked for me. I was attempting to use a 'web.config' file. Everything was named correctly and the files were in the proper location, but it refused to work. I then decided to rename my 'web.config' file to 'app.config' and just like that, it worked.
So if you are having this issue with a 'web.config' file be sure to rename it to 'app.config'.
Solution 8 - C#
This happened to me when I was testing a Class Library (.dll). They were both in the same project but the App.config for the library had the settings I needed. The App I had written to test needed the settings because it was running the library.
Solution 9 - C#
I got this problem as I copied a project from the file explorer and renamed the project. This copied the Debug folder and as I didn't have it set to 'Copy if newer' it didn't overwrite the old App.config file.
Just delete the Debug folder and rebuild. Hope that helps someone.
Solution 10 - C#
I agree with above answer and I would like to add few more points
-
you should make sure you don't put space before and after the : see code below:
private static string Client_ID = ConfigurationManager.AppSettings["ida:ClientId"];
if you put space between ida: ClientId it will not work and will return null
-
make sure your key value names are correct
-
you can try WebConfigurationManager
Solution 11 - C#
Happened to me just now, only when calling it from another project. Apparently, at the other project, the reference has not been defined as a Service Reference but rather as a Connected Service. I deleted the reference and added it again.
Solution 12 - C#
In Visual Studio, right-click on the config file, select Properties, and then change "Copy to Output Directory" to either "Copy always" or "Copy if newer".
Alternatively, manually add the following section as a child of the
<ItemGroup>
<None Update="App.config">
<CopyToOutputDirectory>Always</CopyToOutputDirectory>
</None>
</ItemGroup>