Does Using the `var` Keyword Impact C# Code Performance?

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

The

var 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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