Are .NET Exceptions Really That Slow? A Performance Deep Dive

Is .NET abnormally slow?

.NET’s abnormal execution speed has always been a focus of debate in the industry. Despite numerous articles and benchmark results, no unified conclusion has been reached.

One opinion is that .NET exceptions are really slow and therefore should not be used frequently. Another view is that benchmark tests exaggerate its impact, and in actual application scenarios, the speed impact is negligible.

Weighing of evidence

Skeet, Mariani and Brumme, well-known experts in the .NET community, have all studied this issue in depth. Skeet believes that under normal use, exceptions do not significantly affect speed; Mariani also believes that exceptions will not cause significant performance degradation; Brumme admits that exceptions may have overhead, but it is usually much lower than expected.

Practical application considerations

The practical impact of exception usage is also worth considering. Critics argue that exceptions bypass processor caches, causing performance degradation, especially when traversing deep call stacks. However, it is important to note that custom error handling mechanisms can also cause cache misses.

User Guide

While exceptions themselves are not slow, they should be used with caution. They are best suited for handling unusual situations that indicate potential correctness issues or unexpected events.

Int.TryParse: Case Study

The int.TryParse method is an example of using exceptions appropriately. It provides a reliable way to transform user-supplied input and return a Boolean value to indicate success or failure. However, in scenarios where data integrity is critical (such as reading machine-generated files), using error codes may be more appropriate due to potential unknown consequences.

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