How to use ConfigurationManager

Question

I want to use App.config for storing some setting. I tried to use the next code for getting a parameter from a config file.

private string GetSettingValue(string paramName) {     return String.Format(ConfigurationManager.AppSettings[paramName]); } 

I also added System.Configuration for it (I used a separate class), and in App.config file I have:

<?xml version="1.0" encoding="utf-8" ?> <configuration>   <startup>      <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />   </startup>   <appSettings>     <add key ="key1" value ="Sample" />   </appSettings> </configuration> 

But I got an error while trying to use ConfigurationManager - ConfigurationManager can't exist in such context, but I already added System.Configuration. Or did I miss something?

EDIT:

class with config (full view)

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Configuration;  namespace browser {     class ConfigFile     {         private string GetSettingValue(string paramName)         {             return String.Format(ConfigurationManager.AppSettings[paramName]);         }     } } 

EDIT2

Add how it looks

This means the problem is not during using ConfigurationManger but before - the program "says" that it "doesn't know such element" as I understand the error - the "Element ConfigurationManager" doesn't exist in such context"

EDIT3

EDIT 4

Answer 1

Okay, it took me a while to see this, but there's no way this compiles:

return String.(ConfigurationManager.AppSettings[paramName]); 

You're not even calling a method on the String type. Just do this:

return ConfigurationManager.AppSettings[paramName]; 

The AppSettings KeyValuePair already returns a string. If the name doesn't exist, it will return null.

---

Based on your edit you have not yet added a Reference to the System.Configuration assembly for the project you're working in.

Answer 2

Go to tools >> nuget >> console and type:

Install-Package System.Configuration.ConfigurationManager  

If you want a specific version:

Install-Package System.Configuration.ConfigurationManager -Version 4.5.0 

Your ConfigurationManager dll will now be imported and the code will begin to work.