Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
407 views
in Technique[技术] by (71.8m points)

c# - Does the compiler continue evaluating an expression where all must be true if the first is false?

I'm sure this question has probably been answered before, so I apologize, but I wasn't able to find the proper search terms to find the answer.

Given the following code example, does db.GetRecords().Any() get executed?

string s = "Z";
bool x = s.IndexOfAny(new[] { 'A', 'B' }) > 0 &&
         db.GetRecords().Any();
See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

No. Both && and || are evaluated by short-circuit evaluation. This means that a && b returns false if a is false and a || b returns true if a is true and it will not evaluate b in either of these cases.

If for some reason you do not want short-circuit evaluation you can use the bitwise operators & and |.


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...