Extensions Method trying to call protected methods / wrong exhibition of dynamic parameters

问题

I have a class named NIFERepository. It contains a SaveObject method, which returns nothing and performs an operation on a database.

public class NIFERepository<E>
{
    protected void SaveObject(object saveObject)
    {
        if (saveObject is E)
            this.RepositorySession.Merge(saveObject);
    }
}

1 . I wish to create a public extension method who calls this SaveObject() method, like this:

    public static class NIFERepositoryExtensions
    {
        public static T Save<T, E>(this T self, E saveObject) where T : NIFERepository<E>
        {
            self.SaveObject(saveObject);
            return self;
        }
    }

But the protected scope doesn't allow my extensions method to recognize it.

Is there a way for me to get a method of this form to work?

2 . I created my extension method with 2 types: T and E. T is the instance who called it, and E is the defined type into my ProductRepository<Product>, for example. When I call this method, the defined type is not shown.

Is there a way for me to get this to work?

回答1:

You cannot use extension methods to violate encapsulation.
If the class does not expose the method, you can't call it (except with Reflection).
The method is (hopefully) protected for a reason; you're probably doing something wrong.

回答2:

Protected method are visible inside inherited classes. So do inheritance and create a public method that calls the base protected method like

public class BaseClass
{
  protected void SomeMethod()
   {

   }
}

public class ChildClass:BaseClass
{
  public void SomeMethodPublic()
        {
          base.SomeMethod()
        }
}

来源：https://stackoverflow.com/questions/16067642/extensions-method-trying-to-call-protected-methods-wrong-exhibition-of-dynamic

标签

extension-methods