A Roslyn Analyzer that contains several rules to help improve enumeration performance when using C#.
Note: This analyzer is independent of NetFabric.Hyperlinq. The rules may be useful when you only use foreach, IEnumerable<T>, IAsyncEnumerable<T>, System.Linq or System.Linq.Async.
| Rule ID | Category | Severity | Notes |
|---|---|---|---|
| HLQ001 | Performance | Warning | Assigment to interface causes boxing of enumerator |
| HLQ002 | Compiler | Error | Enumerable cannot be null. |
| HLQ003 | Performance | Warning | Public methods should return highest admissible level interface. |
| HLQ004 | Performance | Warning | The enumerator returns a reference to the item. |
| HLQ005 | Performance | Warning | Avoid use of Single() and SingleOrDefault() |
| HLQ006 | Performance | Warning | GetEnumerator() or GetAsyncEnumerator() should return a value type. |
| HLQ007 | Performance | Warning | Consider returning a non-disposable enumerator. |
| HLQ008 | Performance | Info | The enumerable is a value type. Consider making it readonly. |
| HLQ009 | Performance | Info | Consider removing an empty optional enumerator method. |
| HLQ011 | Compiler | Error | Mutable value-type enumerators cannot be stored in a readonly field. |
| HLQ012 | Performance | Warning | Consider using CollectionsMarshal.AsSpan() when iterating a List<T>. |
| HLQ013 | Performance | Warning | Consider using foreach when iterating an array or a Span<T>. |
Install the NetFabric.Hyperlinq.Analyzer extension from the Visual Studio Marketplace.
Add the NetFabric.Hyperlinq.Analyzer package to your project using your favorite NuGet client.
If added manually to the .csproj, make sure to set PrivateAssets to all so that it's not added as a dependency. A floating version can be used to get the latest version.
<PackageReference Include="NetFabric.Hyperlinq.Analyzer" Version="2.*">
<PrivateAssets>all</PrivateAssets>
<IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
</PackageReference>- Enumeration in .NET by Antão Almada
- NetFabric.Hyperlinq — Optimizing LINQ by Antão Almada
- Unit testing a Roslyn Analyzer by Antão Almada
The following open-source projects are used to build and test this project: