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[Source] .NET/C# collection Any() or Count() which is faster

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Posted on 6/28/2023 7:34:31 PM | | | |
Requirements: Recently, my colleagues in the project team changed the data count() > 0 to Any() to judge whether there is data in the collection (not IQueryble query database), and then asked why it was changed (optimized), but there was no answer.

Use benchmarks to compare which of the following Any() and Count() is faster.

Let's start with the conclusion (in .NET Framwork):Count > Any() > Count()In .NET 6, Count() and Any() performance are not much different, but stillAny() is recommended for collecting whether there is data。

The test code is as follows:


.NET Framework 4.8.1The benchmark data is as follows:



.NET 6The benchmark data is as follows:



Didn't you say that in .NET Framwork Any() > Count() performance? Why is Count() faster than List? The reason is that the underlying Count() method of List calls the Count field, as shown in the figure below:




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