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C# Feature - Range operator

Overview

Section titled “Overview”

The range operator .. creates slices between two indexes and works especially well with arrays, spans, and strings.

Introduced In

Section titled “Introduced In”

C# 8.0 (2019)

Before

Section titled “Before”
string middle = text.Substring(1, text.Length - 2);

After

Section titled “After”
string middle = text[1..^1];

Annotated Example

Section titled “Annotated Example”
int[] lastThree = numbers[^3..];
int[] withoutFirst = numbers[1..];

Gotchas & Best Practices

Section titled “Gotchas & Best Practices”
  • The end index is exclusive.
  • Prefer ranges when slicing is the main idea and not just incidental arithmetic.
Section titled “Related Features”

Version Notes

Section titled “Version Notes”
  • C# 8 introduced Range and the .. operator.