minimal dependency injector

jab.cs

public class Jab : Attribute {
    public T Resolve<T>() where T : class {
        return (T)Resolve(typeof(T));
    }

    public object Resolve(Type typ) {
        var typeToInstantiate = (from t in Assembly.GetExecutingAssembly().GetTypes()
                                 where t.IsDefined(typeof(Jab), false) && t.IsClass && t.IsPublic && t.GetInterfaces().Contains(typ)
                                 select t).Single();
        var defaultConstructor = (from c in typeToInstantiate.GetConstructors().ToList()
                                  where c.IsPublic && c.GetParameters().Length == 0
                                  select c).SingleOrDefault();
        var instanceConstructors = from c in typeToInstantiate.GetConstructors().ToList()
                                   where c.IsPublic && c.IsDefined(typeof(Jab), false)
                                   select c as MethodBase;
        var staticMethods = from m in typeToInstantiate.GetMethods().ToList()
                            where m.IsStatic && m.IsPublic && m.IsDefined(typeof(Jab), false) && m.ReturnType == typeToInstantiate
                            select m as MethodBase;
        var factoryMethod = instanceConstructors.Concat(staticMethods).SingleOrDefault() ?? defaultConstructor;
        var methodArguments = (from p in factoryMethod.GetParameters().ToList() select Resolve(p.ParameterType)).ToArray();
        var obj = factoryMethod is ConstructorInfo ctor ? ctor.Invoke(methodArguments) : factoryMethod.Invoke(null, methodArguments);

        var props = from p in obj.GetType().GetProperties()
                    where p.CanWrite && p.IsDefined(typeof(Jab), false)
                    select p;
        props.ToList().ForEach(p => p.SetMethod.Invoke(obj, new object[] { Resolve(p.PropertyType) }));
        var fields = from f in obj.GetType().GetFields()
                     where f.IsPublic && f.IsDefined(typeof(Jab), false)
                     select f;
        fields.ToList().ForEach(f => f.SetValue(obj, Resolve(f.FieldType)));

        return obj;
    }
}