Ninject Dependency Injection Using Reflection

Question

public DefaultRepositoryRegistry(IKernel kernel)
{
    foreach (var tuple in DefaultContractList())
    {
        var iRepo = tuple.Item1;
        var repo = tuple.Item2;
    }
}

private static IEnumerable<Tuple<Type, Type>> DefaultContractList()
{
    var contractList = new List<Tuple<Type, Type>>()
    {
        #region Mongo

        Tuple.Create(typeof (IMongoRepository), typeof (MongoRepository)),

        #endregion Mongo
    };

    return contractList;
}

I am unable to do dynamic binding eg

foreach (var tuple in DefaultContractList())
{
    var iRepo = tuple.Item1;
    var repo = tuple.Item2;

    kernel.Bind<iRepo>().To<repo>();
}

Any help as to why Ninject doesn't accept this type of binding? I am doing this so that one can use the same set of services in for different dependency injection frameworks.

Answer 1

This syntax probably won't compile:

foreach (var tuple in DefaultContractList())
{
    var iRepo = tuple.Item1;
    var repo = tuple.Item2;

    kernel.Bind<iRepo>().To<repo>();
}

The bits inside the angle brackets are called type parameters (eg <iRepo> and <repo> ), and they should be the actual type names, not variables of type System.Type . It just so happens, though, that Ninject has an alternate form of binding that will probably work perfectly for you:

foreach (var tuple in DefaultContractList())
{
    var iRepo = tuple.Item1;
    var repo = tuple.Item2;

    kernel.Bind(iRepo).To(repo);
}