RangeForeach.Sources 0.5.0

C# Range-Foreach Syntax Extensions

Provides the range-foreach syntax for C# 9.0 or higher.

Supported frameworks:

• .NET Framework >= 4.0
• .NET Core >= 1.0
• .NET Standard >= 1.0

NOTE: This is a source-only package and will not introduce any explicit dependencies to your project. Add the PrivateAssets="all" attribute to the PackageReference to avoid dependency to this package:

<PackageReference Include="RangeForeach.Sources" Version="0.5.0" PrivateAssets="all" />

Range-Foreach Syntax

Reference this package to write foreach-loops like this:

foreach (var index in 0..100)
{
    // loop body...
}

which is equivalent to the legacy for-loop below:

for (int index = 0; index < 100; index++)
{
    // loop body...
}

NOTE: Use ^ to represent negative numbers, e.g. ^100..0 (instead of -100..0).

Stepped Syntax

Use the Step method to write foreach-loops like this:

foreach (var index in (99..^1).Step(-2))
{
    // loop body...
}

which is equivalent to the legacy for-loop below:

for (int index = 99; index >= 0; index -= 2)
{
    // loop body...
}

Dependency Type Polyfill

This syntax requires the System.Range type (and also the System.Index type). Considering that early frameworks do not provide this type, this package includes the polyfill source.

If a third party package that includes the System.Range type (such as IndexRange, etc.) is referenced, define the INDEX_RANGE constant in the project file to avoid duplicate definitions:

<DefineConstants>INDEX_RANGE</DefineConstants>

Performance Benchmark

BenchmarkDotNet=v0.13.1, OS=Windows 10.0.22000
AMD Ryzen 7 5800H with Radeon Graphics, 1 CPU, 16 logical and 8 physical cores
.NET SDK=6.0.302
  [Host]     : .NET 6.0.7 (6.0.722.32202), X64 RyuJIT
  DefaultJob : .NET 6.0.7 (6.0.722.32202), X64 RyuJIT