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var con = ConfigurationManager.AppSettings["MyConnectionString"];
var paramStringCon = new ParameterOverrides();
container.RegisterType<StringCon>();
container.Resolve<StringCon>(new ResolverOverride[]
{
new ParameterOverride("str", con)
});
var logProd = container.Resolve(typeof(Microsoft.Extensions.Logging.ILogger<ProductoRepository>));
container.RegisterType<ProductoRepository>(nameof(ProductoRepository),
new InjectionConstructor(container.Resolve<StringCon>(new ResolverOverride[]
{
new ParameterOverride("str", con)
}), logProd));
new UnityDependencyResolver(container);
DependencyResolver.SetResolver(new UnityDependencyResolver(container));