Ninject - binding constructors with arguments / Entity Framework connection string

Question

Please forgive my ignorance, but I am very new to IOC and NinJect. I have searched for high and low for easily understandable solutions but so far they have eluded me.

S

Answer 1

Newer versions of Ninject allow to get rid of magic strings in the binding definition. Something like this:

public class StandardModule : NinjectModule
{
    public override void Load()
    {
        string connectionString = "...";
        Bind<IMyEntityFrameWorkRepository()
            .ToConstructor(_ => new MyEntityFrameWorkRepository(connectionString);
    }
}

For bindings involving generic types (e.g. bind ISomeService<T> to SomeService<T> and binding should be performed for all possible types at once), ToConstructor cannot be used (a new expression is required), so WithConstructorArgument remains the simplest approach. E.g.:

Bind(typeof(ISomeService<>))
    .To(typeof(SomeService<>))
    .WithConstructorArgument("someParam", "someValue");

Answer 2

You can use the .WithConstructorArgument() method to specify constructor arguments. The first argument should be the name of the constructor parameter.

public class StandardModule : NinjectModule
{
    public override void Load()
    {
        string connectionString = "...";
        Bind<IMyEntityFrameWorkRepository().To<MyEntityFrameWorkRepository>()
            .WithConstructorArgument("sqlConnectionString", connectionString);
    }

}