I have a wpf application which is using a dll of a class library. I am unable to access the app.config value in the class library
How I'm trying to access app.config:
ConfigurationSettings.AppSettings["conStr"].ToString();
this is returning a null value using System.Configuration is also added .
Why don't you just put that value in the Main Project ?
If you're calling the class library from the Main Project. Then the code in the class library uses the AppConfig defined inside the main project.
It is a common practice to have the connection string in the AppConfig for the Main Project and not inside the Class Library.
I recomend to use your own class for save Class Library settings. Something like this:
public class GlobalSettings
{
public double RedFiber { get; set; }
public double GreenFiber { get; set; }
public double BlueFiber { get; set; }
public bool DeleteMinorViews { get; set; }
public static GlobalSettings Load()
{
try
{
return JsonConvert.DeserializeObject<GlobalSettings>(File.ReadAllText(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData) + "\\YOUR_APP_NAME\\"));
}
catch ()
{
return DefaultSettings;
}
}
public void Save()
{
File.WriteAllText(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData) + "\\YOUR_APP_NAME\\", JsonConvert.SerializeObject(this, Formatting.Indented));
}
private static readonly GlobalSettings DefaultSettings = new GlobalSettings()
{
RedFiber = 0,
GreenFiber = 255,
BlueFiber = 0,
DeleteMinorViews = true,
};
}
I had the same issue. Try adding a settings file for your class library to store your values. The value will be stored in the app.config but accessed using the settings file.
This post explains better: Can a class library have an App.config file?
This post goes into more detail about settings files: Best practice to save application settings in a Windows Forms Application
If you prefer not to do the above you can also move your data to the main projects App.config file and it should work.
try
ConfigurationManager.AppSettings["conStr"].ToString();
If the does not work post your App.Config
ConfigurationSettings.AppSettings is obsolete
