Does Using `var` in C# Affect Performance?

Does using the var keyword in C# affect performance?

The previous discussion established that using the 'var' keyword is primarily associated with anonymous types, but is also commonly used to improve code simplicity. However, there are concerns about the impact it could have on performance, especially if used extensively.

var The impact of keywords on IL code

Contrary to expectations, no additional IL code is generated when the 'var' keyword is used with non-anonymous types. The IL code generated by the compiler is equivalent whether 'var' is used or not. Therefore, any perceived performance impact is non-existent.

Type inference and considerations

The only difference in using 'var' is its ability to infer the exact type, which may be different from the interface or parent type you manually selected. However, this difference does not have a measurable impact on performance.

Conclusion

Using the 'var' keyword will not cause a performance penalty. It remains a viable option for writing clean and convenient code without compromising execution speed or code quality.

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