CODEWITHSUNDEEP
c#performancenamespacesinclude
Hoppe
Hoppe

Reputation: 6805

Is there a performance gain in removing unnecessary namespace (using) directives?

Does it matter how many using compiler directives are in my classes? Is there a performance gain in removing those that aren't necessary?

Although I enjoy writing streamlined code, on occasion, code segments get modified, and don't have the opportunity to go back and check to see if all of the included namespaces are really necessary. Or, I don't go back and remove those that are auto-inserted by visual studio.

i.e.: 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

Thanks!

Upvotes: 10

Views: 2238

Answers (1)

Robert Harvey
Robert Harvey

Reputation: 180788

No, there's no performance advantage.

The compiler doesn't generate IL (executable code) for using statements. IL is only generated for those classes, method calls, etc. that take advantage of the using statements you provide.

Consequently, the only effect unused using statements might have is to slightly increase your build time, or make the next developer after you wonder why they are there.

Upvotes: 25

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