Registering concrete type with parameter is null using Autofac - autofac

Question

I have the following class:
public class Errors
{
private readonly string _connectionString;
public Errors(string connectionString)
{
_connectionString = connectionString;
}
}
I'm trying to register using Autofac like so:
builder.RegisterType<Errors>().WithParameter("connectionString", System.Configuration.ConfigurationManager.ConnectionStrings["myConn"].ConnectionString);
This object is getting injected into another object but it's always null. Looking further into the exception, the following error message is displayed:
Cannot choose between multiple constructors with equal length 1 on type 'System.String'.
Select the constructor explicitly, with the UsingConstructor() configuration method, when the component is registered.
I've tried registering using the UsingConstructor and WithParameter and there's no change.

Answer 1

Try This, there are 2 ways to register
First Type:
builder.Register(c => new Errors(System.Configuration.ConfigurationManager.ConnectionStrings["myConn"].ConnectionString)).InstancePerLifetimeScope();
Second Type:
public class Errors
{
private string _connectionString{ get; set; }
public Errors(string connectionString)
{
_connectionString = connectionString;
}
}
Register Like below
builder.RegisterType<Errors>().WithParameter("connectionString", System.Configuration.ConfigurationManager.ConnectionStrings["myConn"].ConnectionString);
EDIT: Testing
class Program
{
static void Main(string[] args)
{
var builder = new ContainerBuilder();
builder.Register(c => new Errors(ConfigurationManager.ConnectionStrings["myConn"].ConnectionString)).InstancePerLifetimeScope(); // Type 1
// builder.RegisterType<Errors>().WithParameter("connectionString", ConfigurationManager.ConnectionStrings["myConn"].ConnectionString); // Type 2
var container = builder.Build();
var objErrors = container.Resolve<Errors>();
}
}
And the config file looks like
<connectionStrings>
<add name="myConn" connectionString="Some Connection String"/>
</connectionStrings>
Please read this Autofac Wiki
Tested in Autofac Version: 2.6.1.841
Result: