Refernce method from an instantiated class?

Question

Hi,

In my MainForm class I have a method, Refresh(), that simply makes a call to the backend database and refreshes the data on the form.

In my MainForm I instantiate another class object and on this object are some form elements I display on the main form in a container. One of these is a Save button that writes any changes back to the database and I would also like it to also call the Refresh() method of the MainForm class to refresh all of the data.

My problem is I cannot figure out how to make this call, how do I reference the method from the MainForm class from an instantiated class?

Thanks in advance!

Answer 1

Consider the events too. In your another class you can define an event, then raise it after saving the changes to database:

class AnotherClass
{
   // . . .

   public event EventHandler Saved;

   void SaveToDatabase( )
   {
      // . . .

      Saved?.Invoke( this, null );
   }
}

I your main form you can handle this event:

AnotherClass c = . . .
c.Saved += ( s, a ) => Refresh( );

Answer 2

Under normal circumstances, we have two ways to call a method in another class.

One is to instantiate the class:

    class Program  
    {  
        static void Main(string[] args)  
        {  
            new MyClass().DoSomething();  
        }  
    }  
    class MyClass  
    {  
        public void DoSomething()   
        {  
            Console.WriteLine("Do something...");  
        }  
    }  

The second is to set the method as a static method, and then access it through the class name:

    class Program  
    {  
        static void Main(string[] args)  
        {  
            MyClass.DoSomething();  
        }  
    }  
    class MyClass  
    {  
        public static void DoSomething()   
        {  
            Console.WriteLine("Do something...");  
        }  
    }  

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