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

Detailed explanation of "=" syntax in C# event processing

In event-driven programming, the " =" syntax is often used to subscribe to events. However, its usage can cause some confusion, especially between the following two notations:

<code class="language-csharp">[object].[event] += anEvent;

[object].[event] += new EventHandler(anEvent);</code>

The essence of " = anEvent" notation

The first representation takes advantage of the power of delegated inference. When using this syntax, the compiler automatically determines the delegate type based on the provided event handler anEvent. In the example above, the event is assumed to be of type EventHandler.

Explicit "new EventHandler(anEvent)" notation

The second notation is more explicit and creates a new delegate object of type EventHandler before subscribing to the event. The argument passed to the EventHandler constructor is the event handler anEvent. This approach allows more control over the delegate type, which may be useful in specific scenarios.

Important Note

It’s worth mentioning that there is no practical difference between these two notations. The former is syntactic sugar for the latter, introduced in C# 2.0 to simplify the process of subscribing to events. In C# 1.0 projects, only explicit notation is available.

Suggestion

While both notations are valid, the " = anEvent" notation is generally preferred due to its simplicity. It is commonly used in modern C# code bases and adheres to the principle of keeping code clean and readable.

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