C# Event Handling: What's the Difference Between ` = anEvent` and ` = new EventHandler(anEvent)`?

The difference between = anEvent and = new EventHandler(anEvent) in C#

Lambda expressions in C# simplify the syntax for adding event handlers, leading to two common practices:

1. = anEvent

• Example: button1.Click = anEvent;
• Here, anEvent is a delegate that refers to the method to be executed when the event occurs. The compiler automatically infers the correct delegate type based on the method signature.

2. = new EventHandler(anEvent)

• Example: button1.Click = new EventHandler(anEvent);
• This syntax explicitly specifies the delegate type (EventHandler) before assigning the event handler.

The difference between the two methods

The fundamental difference lies in the delegated inference mechanism:

• In the first method, the compiler infers the delegate type and provides concise syntax sugar.
• In the second method, the delegate type is explicitly defined, which is necessary in C# 1.0 projects because delegate inference was not introduced before C# 2.0.

Summary: They are equivalent

Both methods can achieve the same functionality. Which method you choose comes down to personal preference. For C# 2.0 and higher projects, use = anEvent to make your code cleaner, and = new EventHandler(anEvent) to explicitly define delegate types.

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