Global Variables in ASP.Net Core 2
I often do this kind of thing with connection strings and other global constants. First create a class for those variables that you need. In my project it is MDUOptions
but whatever you want.
public class MDUOptions
{
public string mduConnectionString { get; set; }
public string secondaryConnectionString { get; set; }
}
Now in your Startup.cs ConfigureServices method:
Action<MDU.MDUOptions> mduOptions = (opt =>
{
opt.mduConnectionString = Configuration["ConnectionStrings:mduConnection"];
});
services.Configure(mduOptions);
services.AddSingleton(resolver => resolver.GetRequiredService<IOptions<MDUOptions>>().Value);
Now you use DI to access it in code:
public class PropertySalesRepository : IPropertySalesRepository
{
private static string _mduDb;
public PropertySalesRepository(MDUOptions options)
{
_mduDb = options.mduConnectionString;
}
....
}
In my case the only property I wanted was the string but I could have used the entire options class.
In appsettings.json keep the variables.
{
"foo": "value1",
"bar": "value2",
}
Create AppSettings class.
public class AppSettings
{
public string foo { get; set; }
public string bar { get; set; }
}
In Startup.cs file register.
public IServiceProvider ConfigureServices(IServiceCollection services)
{
services.Configure<AppSettings>(Configuration);
}
Usage,
public class MyController : Controller
{
private readonly IOptions<AppSettings> _appSettings;
public MyController(IOptions<AppSettings> appSettings)
{
_appSettings = appSettings;
}
var fooValue = _appSettings.Value.foo;
var barValue = _appSettings.Value.bar;
}