Russ Clark Russ Clark - 4 months ago 14
C# Question

Reading settings from app.config or web.config in .net

I'm working on a C# class library that needs to be able to read settings the

web.config
or
app.config
file (depending on whether the DLL is referenced from an ASP.NET web application or a Windows Forms application).

I've found that

ConfigurationSettings.AppSettings.Get("MySetting")


works, but that code has been marked as deprecated by Microsoft.

I've read that I should be using:

ConfigurationManager.AppSettings["MySetting"]


However, the
System.Configuration.ConfigurationManager
class doesn't seem to be available from a C# Class Library project.

Does anyone know what the best way to do this is?

Answer

You'll need to add a reference to System.Configuration in your project's references folder.

You should definitely be using the ConfigurationManager over the obsolete ConfigurationSettings.