c# Use As , not is in


In C#, use as, not is. The is keyword is used to see whether a reference can be cast as particular type, but it doesn’t return a reference converted to that type. So usually, if you get a positive result from the is, the first thing you’ll do is a cast—effectively implementing the same cast twice. With the as keyword, a reference cast as the new type is returned if it’s valid and a null is returned if it’s not. You then can check for the null and do what you like. The asapproach is fully 50% faster than the is approach.

Advertisements

About bpostaci
Sr. Support Escalation Engineer in Microsoft.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: