Does Using `var` in C# Impact Performance?

var Impact of keywords on performance

In C#, the var keyword is widely used, although it is mainly used for anonymous types. Questions have been raised about its potential impact on performance.

There is concern that using var will generate additional IL code. However, for non-anonymous types, the generated IL code is the same whether or not var is used. This means there is no performance penalty in terms of IL code size.

However, it is important to note that var infers an exact type, thus limiting flexibility. While this does not directly impact performance, it can cause potential problems if the inferred types do not match the intended use.

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