当前位置: 动力学知识库 > 问答 > 编程问答 >

c# - Attaching Eventhandler with New Handler vs Directly assigning it

问题描述:

What is the actual difference, advantages and disadvantages, of creating a new event handler, vs assigning it directly to the event?

_gMonitor.CollectionChanged += new NotifyCollectionChangedEventHandler(OnCollectionChanged);

vs

_gMonitor.CollectionChanged += OnCollectionChanged;

网友答案:

In C# 2.0 and above, they are identical. In C# 1.2 (the one that shipped with .NET 1.1), only the first syntax (with new) compiles ;-p

The second syntax saves key presses, but VS intellisense will typically suggest the first. Ultimately, it makes very little difference. I generally use the second syntax in code-samples online, simply because it avoids going over the (narrow) column width!

网友答案:

The compiler has enough information available to make the new EventHandler effectively syntactic sugar.

It knows that you are attaching an event handler to an event, as only += and -= are valid at this point, so you don't need tell it what to do.

分享给朋友:
您可能感兴趣的文章:
随机阅读: