String Performance: Optimizing String Substring Extraction – Slicing vs. AsSpan()

An alternative method for obtaining a substring is through slicing, as demonstrated in the following example:

ReadOnlySpan<char> slice = this.LongTestString[1..25];

Alternatively, you can achieve the same result using the AsSpan() method, as illustrated below:

var slice = this.LongTestString.AsSpan()[1..25];

Benchmark Results

Benchmark tests show that employing the AsSpan() method yields a 2.07x performance boost and consumes fewer memory resources.

This is how I have it configured in my EditorConfig to check for this issue: dotnet_diagnostic.CA1831.severity = error

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