Resolved No overload for 'method' matches delegate 'EventHandler'

Hi,

I spent some time tonight learning about delegates and events, following a similar example as in this video.

I created two classes, one subscriber, one publisher.
I wanted the subscriber to display the number of space counts.

In the video I linked, at [10:10] there seems to be no issue for him to use "TestingEvents.OnspacePressedEventArgs' in the definition of his function passed to the delegate, instead of "EventArgs".

Can someone explain me why?

Here is the error, in the subscriber script, line 14:
No overload for 'DisplaySpaceCounter' matches delegate 'EventHandler'

Here is my code:

Code (CSharp):

1. using System;
2. using System.Collections;
3. using System.Collections.Generic;
4. using UnityEngine;
5. using UnityEngine.InputSystem;
6.  
7. public class TestinEventsSubscriber : MonoBehaviour
8. {
9.     TestinEventsPublisher myPublisher;
10.  
11.     void Awake()
12.     {
13.          myPublisher = GetComponent<TestinEventsPublisher>();
14.          myPublisher.OnSpacePressed += DisplaySpaceCounter;
15.     }
16.  
17.     private void DisplaySpaceCounter(object sender, TestinEventsPublisher.OnSpacePressedEventArgs e)
18.     {
19.         Debug.Log("Space: " + e.spaceCount);
20.     }
21.  
22. }
23.  

Code (CSharp):

1. using System;
2. using System.Collections;
3. using System.Collections.Generic;
4. using UnityEngine;
5. using UnityEngine.InputSystem;
6.  
7. public class TestinEventsPublisher : MonoBehaviour
8. {
9.     [SerializeField] public InputAction spaceBar;
10.     public event EventHandler OnSpacePressed;
11.     int spaceCount = 0;
12.  
13.     public class OnSpacePressedEventArgs : EventArgs
14.     {
15.         public int spaceCount;
16.     }
17.  
18.     void Awake()
19.     {
20.         spaceBar.performed += InvokeOnSpaceBarPressed;
21.     }
22.  
23.     void OnEnable()
24.     {
25.         spaceBar.Enable();
26.     }
27.  
28.     void InvokeOnSpaceBarPressed(InputAction.CallbackContext context)
29.     {
30.         spaceCount++;
31.         OnSpacePressed?.Invoke(this, new OnSpacePressedEventArgs{spaceCount = spaceCount});
32.     }
33. }

 

If you look at 09:20 in the video you will see that you have missed adding your OnSpacePressedEventArgs class as the generic parameter to your

public event EventHandler OnSpacePressed;

line.
CM has it as:

public event EventHandler<OnSpacePressedEventArgs> OnSpacePressed;

 

Indeed, thank you so much!!!