juniorLINQ
Difference between Count and LongCount
Updated May 16, 2026
Short answer
Count returns int; LongCount returns long.
Deep explanation
LongCount is used for very large sequences exceeding int.MaxValue.
Real-world example
Counting massive log entries.
Common mistakes
- Using Count for huge datasets causing overflow.
Follow-up questions
- Is Count expensive?
- Does EF translate LongCount?