How do I replace a method from base class in C#?-CodePudding

I have a base class named Broadcaster that can broadcast any info (byte arrays) using TCP. Now I want to create a class named ScreenBroadcaster that is derived from Broadcaster and can broadcast screenshots.

But I faced the following problem. Class Broadcaster has a method Broadcast(byte[] data) that should be replaced in ScreenBroadcaster with just Broadcast() (it should take the data to broadcast from the screen). I can't figure out how to do it, please help me!

I know about the keyword override, but it doesn't allow to change the signature of the method to override, so it doesn't work in this case.

CodePudding user response：

You can't implement exactly what you want. Why? Consider this sample code:

byte[] data = new byte[] { 0, 1, 2, 3 };
Broadcaster bcaster = new ScreenBroadcaster();
bcaster.Broadcast(data);

It is absolutely correct. Any reference to Broadcaster can refer to ScreenBroadcaster because it's derived from Broadcaster. But ScreenBroadcaster (if it's implemented as you want) hasn't got method Broadcast(byte[]) that is called here. What should the executing environment (.NET Framework) do? No idea. So what you want isn't allowed in C#.

But why don't you leave method Broadcast(byte[] data) in ScreenBroadcaster? You may even use it in Broadcast() to avoid code duplication, as said in the comments.

public void Broadcast() {
  byte[] data;
  // Fill "data" with an image from screen
  Broadcast(data);
}