After I've read this article about dependency injection Here I still do not have a clear understanding on how to read the appsetting in other than a controller classes.
Lets say for instance I have a helper class with a bunch of static methods that I'm planning to use, I do not create an instance of this class, how do I read setting values to use inside the methods of this class?
I used to create helper class to read data from appsettings.config in one of my applications:
public static class ConfigValueProvider
{
private static readonly IConfigurationRoot Configuration;
static ConfigValueProvider()
{
var builder = new ConfigurationBuilder()
.SetBasePath(Directory.GetCurrentDirectory())
.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true);
Configuration = builder.Build();
}
public static string Get(string name)
{
return Configuration[name];
}
}
However later I reviewed my application to get away from static methods which depends on application config in order to make my application testable.
You should use services.Configure as below:
public class Startup
{
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
public IConfiguration Configuration { get; }
// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
services.Configure<JSonAsClass>(Configuration.GetSection("MySectionName"));
services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
}
then you can inject JSonAsClass inside any class you want to use it:
private JSonAsClass jSonAsClass;
public MailService(IOptions<JSonAsClass> jSonAsClass)
{
this.jSonAsClass = jSonAsClass.Value;
}
