CycleDetection 2.0.0

dotnet add package CycleDetection --version 2.0.0
NuGet\Install-Package CycleDetection -Version 2.0.0
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
<PackageReference Include="CycleDetection" Version="2.0.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add CycleDetection --version 2.0.0
#r "nuget: CycleDetection, 2.0.0"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.
// Install CycleDetection as a Cake Addin
#addin nuget:?package=CycleDetection&version=2.0.0

// Install CycleDetection as a Cake Tool
#tool nuget:?package=CycleDetection&version=2.0.0

This is a fork of Daniel Bradley's C# implementation of the Tarjan cycle detection algorithm.

IOW: You can use this library to sort dependencies and even handle cyclic references. e.g. to compile stuff in the right order.

I found it to be quite useful but I didn't like how one had to manually setup the dependency vertices. (It also supports custom comparers now.)

So I moved the original code into the Core sub namespace and wrote a class that allows to setup dependencies using a simple lambda expression.

The easiest way to use it is to install the nuget package.

This example shows a case in which A depends on B, B depends on C but C depends on A. Thus creating a cyclic dependency. There's also D which depends on B.

// A→B
// ↑ ↓
// └─C

var graph = new[]
{
  new{Value ="D", DependsOn = "B"},
  new{Value ="A", DependsOn = "B"},
  new{Value ="B", DependsOn = "C"},
  new{Value ="C", DependsOn = "A"},
};

var components = graph.DetectCyclesUsingKey(
    s => s.Value,
    s => s.DependsOn);

Assert.AreEqual(2, components.Count); // 1 cycle + D
Assert.AreEqual(1, components.IndependentComponents().Count()); // only D is outside the cycle
Assert.AreEqual(1, components.Cycles().Count()); // 1 cycle
Assert.AreEqual(3, components[0].Count); // the cycle has 3 components
Assert.AreEqual("D", components[1].Single().Value); // D is after the cycle, because it depends on it

I also added a way to merge cyclic dependencies into a single entity. Which is probably not that interesting for most. However, I use it to have a merged assembly from every cycle of interconnected Jars when I compile them using IKVMC. And have that merged assembly name as the reference for the other Jar-assemblies.

var mergedGraph = components.MergeCyclicDependencies((cycle, getMerged) => new
                  {
                    Value = cycle.Contents.OrderBy(t => t.Value)
                                          .Aggregate("", (r, c) => r + "-" + c.Value).TrimStart('-'),
                    DependsOn = (from d in cycle.Dependencies
                                 select (getMerged(d) ?? d.Single()).Value).SingleOrDefault()
                  });

Result

{ Value = "A-B-C", DependsOn = null } -> the name reflects all included items
{ Value = "D", DependsOn = "A-B-C" } -> D now references the new name (thx to "getMerged")

Original Readme:

Just decided to put together a c# project for an implementation of the Tarjan cycle detection algorithm as I can't seem to find any out there already.

The original code for this was posted on stackoverflow by user623879.

Hope this is useful!

Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  net5.0-windows was computed.  net6.0 was computed.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 was computed.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed.  net8.0 was computed.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed. 
.NET Core netcoreapp1.0 was computed.  netcoreapp1.1 was computed.  netcoreapp2.0 is compatible.  netcoreapp2.1 was computed.  netcoreapp2.2 was computed.  netcoreapp3.0 was computed.  netcoreapp3.1 was computed. 
.NET Standard netstandard1.0 is compatible.  netstandard1.1 is compatible.  netstandard1.2 was computed.  netstandard1.3 was computed.  netstandard1.4 was computed.  netstandard1.5 was computed.  netstandard1.6 was computed.  netstandard2.0 was computed.  netstandard2.1 was computed. 
.NET Framework net40 is compatible.  net403 was computed.  net45 is compatible.  net451 was computed.  net452 was computed.  net46 was computed.  net461 was computed.  net462 was computed.  net463 was computed.  net47 was computed.  net471 was computed.  net472 was computed.  net48 was computed.  net481 was computed. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen tizen30 was computed.  tizen40 was computed.  tizen60 was computed. 
Universal Windows Platform uap was computed.  uap10.0 was computed. 
Windows Phone wp8 was computed.  wp81 was computed.  wpa81 was computed. 
Windows Store netcore was computed.  netcore45 was computed.  netcore451 was computed. 
Xamarin.iOS xamarinios was computed. 
Xamarin.Mac xamarinmac was computed. 
Xamarin.TVOS xamarintvos was computed. 
Xamarin.WatchOS xamarinwatchos was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages (1)

Showing the top 1 NuGet packages that depend on CycleDetection:

Package Downloads
TngTech.ArchUnitNET

C# Version of ArchUnit (see: archunit.org)

GitHub repositories (1)

Showing the top 1 popular GitHub repositories that depend on CycleDetection:

Repository Stars
TNG/ArchUnitNET
A C# architecture test library to specify and assert architecture rules in C# for automated testing.
Version Downloads Last updated
2.0.0 1,663,320 3/8/2019
1.0.1.1 14,587 11/18/2013
1.0.0 1,543 11/14/2013