The impact of var
keywords on performance in C#
var
Keywords improve code writing efficiency, but whether it affects performance has been controversial. Let's analyze whether var
affects intermediate language (IL) code and therefore code performance.
IL code generation
Contrary to popular belief, using var
does not generate additional IL code. The compiler converts var
directly to the corresponding type, so var
produces exactly the same IL code as an explicitly typed variable. So, for non-anonymous types, var
adds no overhead.
Compiler Optimization
However, var
can lead to more precise type inference. In the case of manually assigned interface or superclass types, var
will reduce the type to its exact representation. While this optimization improves code maintainability, it does not impact performance.
Conclusion
Thevar
keyword does not generate additional IL code or reduce application performance. It's just a convenient way to simplify writing code and improve readability. Using var
can help developers ensure that the correct types are inferred without impacting the performance of their code.
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