Performance cost of casting

[Joel]

Is there a run-time performance cost for casting?

 

[Jon Skeet [C# MVP]]

Is there a run-time performance cost for casting?

Yes, but it's very small. How many casts are you thinking of doing?

 

[Joel Wilson]

It's more of an academic question of casting vs. Convert.To(). I assume
the "small" performance hit is a typecheck on the object being cast.

 

[Jon Skeet [C# MVP]]

It's more of an academic question of casting vs. Convert.To(). I assume
the "small" performance hit is a typecheck on the object being cast.

Yes. Using the "as" operator (for reference types) is marginally faster
in the current CLR, and certainly using "as" and then a nullity check
is faster than "is" and then a cast, but most of the time it shouldn't
have any significant impact.