Was this page helpful?
Your feedback about this content is important. Let us know what you think.
Additional feedback?
1500 characters remaining
CA1809: Avoid excessive locals

CA1809: Avoid excessive locals







Breaking Change


A member contains more than 64 local variables, some of which might be compiler-generated.

A common performance optimization is to store a value in a processor register instead of in memory, which is referred to as enregistering the value. The common language runtime considers up to 64 local variables for enregistration. Variables that are not enregistered are put on the stack and must be moved to a register before manipulation. To allow the chance that all local variables get enregistered, limit the number of local variables to 64.

To fix a violation of this rule, refactor the implementation to use no more than 64 local variables.

It is safe to suppress a warning from this rule, or to disable the rule, if performance is not an issue.

© 2015 Microsoft