Creedengo-C#
May 21, 2025 · View on GitHub
Creedengo-C#
creedengo is a collective project aiming to reduce environmental footprint of software at the code level. The goal of the project is to provide a list of static code analyzers to highlight code structures that may have a negative ecological impact: energy and resources over-consumption, "fatware", shortening terminals' lifespan, etc.
creedengo is based on evolving catalogs of good practices, for various technologies. This set of Roslyn analyzers implements these catalogs as rules for scanning your C# projects.
🚀 Getting Started
There are several ways you can use the creedengo C# analyzers in your .Net projects:
- As a NuGet package
- As a .NET tool
- As an analyzer for SonarQube.
🧩 NuGet package
The package is available on nuget.org at this address : https://www.nuget.org/packages/Creedengo, and can be added to your projects/solutions like any NuGet package. Once referenced and restored, the creedengo analyzers are automatically integrated in your IDE/compilation process, and will list any applicable info/alert.
Pre-requisite : .Net Standard 2.0, which can be used in a wide range of projects. See Microsoft documentation for details about the supported Frameworks.
🧩 .Net tool
The .Net tool is available on nuget.org at this address : https://www.nuget.org/packages/Creedengo.Tool, and can be fetched on your machine using the following command :
dotnet tool install --global Creedengo.Tool
See .Net tools documentation for additional information.
Once installed, you can launch an analyzis on an existing codebase like this :
creedengo-cli analyze path/to/mySolution.sln path/to/myReport.html.
The file to analyze can be a .sln, a .slnx or a .csproj. The report format depends on it's required extension, the following are currently supported : .html, .json and .csv.
Pre-requisite : .Net 8 SDK.
🧩 Analyzer for SonarQube
Creedengo C# can use SonarScanner for .Net to integrate with SonarQube, and uses a custom import addition to enrich what is reported to Sonar (severity, description, url page, category, and so on). See our dedicated repository for more information.
🌿 Creedengo Rules
| Id | Description | Severity | Code fix |
|---|---|---|---|
| GCI69 | Don’t call loop invariant functions in loop conditions | ⚠️ | ❌ |
| GCI72 | Don’t execute SQL queries in loops | ⚠️ | ❌ |
| GCI75 | Don’t concatenate strings in loops | ⚠️ | ❌ |
| GCI81 | Specify struct layouts | ⚠️ | ✔️ |
| GCI82 | Variable can be made constant | ℹ️ | ✔️ |
| GCI83 | Replace Enum ToString() with nameof | ⚠️ | ✔️ |
| GCI84 | Avoid async void methods | ⚠️ | ✔️ |
| GCI85 | Make type sealed | ℹ️ | ✔️ |
| GCI86 | GC.Collect should not be called | ⚠️ | ❌ |
| GCI87 | Use collection indexer | ⚠️ | ✔️ |
| GCI88 | Dispose resource asynchronously | ⚠️ | ✔️ |
| GCI91 | Use Where before OrderBy | ⚠️ | ✔️ |
| GCI92 | Use Length to test empty strings | ⚠️ | ✔️ |
| GCI93 | Return Task directly | ℹ️ | ✔️ |
| GCI95 | Use is operator instead of as operator | ℹ️ | ✔️ |
🌿 Customized Roslyn Rules
Creedengo C# customizes the severity of the following native Roslyn rules.
| Id | Description | Old Severity | New Severity |
|---|---|---|---|
| CA1001 | Types that own disposable fields should be disposable | 💤 | ⚠️ |
| CA1802 | Use Literals Where Appropriate | 💤 | ⚠️ |
| CA1805 | Do not initialize unnecessarily | 💤 | ⚠️ |
| CA1813 | Avoid unsealed attributes | 💤 | ⚠️ |
| CA1816 | Call GC.SuppressFinalize correctly | ℹ️ | ⚠️ |
| CA1821 | Remove empty finalizers | ℹ️ | ⚠️ |
| CA1822 | Mark members as static | ℹ️ | ⚠️ |
| CA1824 | Mark assemblies with NeutralResourcesLanguageAttribute | ℹ️ | ⚠️ |
| CA1825 | Avoid zero-length array allocations | ℹ️ | ⚠️ |
| CA1826 | Use property instead of Linq Enumerable method | ℹ️ | ⚠️ |
| CA1827 | Do not use Count()/LongCount() when Any() can be used | ℹ️ | ⚠️ |
| CA1828 | Do not use CountAsync/LongCountAsync when AnyAsync can be used | ℹ️ | ⚠️ |
| CA1829 | Use Length/Count property instead of Enumerable.Count method | ℹ️ | ⚠️ |
| CA1830 | Prefer strongly-typed Append and Insert method overloads on StringBuilder | ℹ️ | ⚠️ |
| CA1832 | Use AsSpan or AsMemory instead of Range-based indexers for getting ReadOnlySpan or ReadOnlyMemory portion of an array | ℹ️ | ⚠️ |
| CA1833 | Use AsSpan or AsMemory instead of Range-based indexers for getting Span or Memory portion of an array | ℹ️ | ⚠️ |
| CA1834 | Use StringBuilder.Append(char) for single character strings | ℹ️ | ⚠️ |
| CA1835 | Prefer the memory-based overloads of ReadAsync/WriteAsync methods in stream-based classes | ℹ️ | ⚠️ |
| CA1836 | Prefer IsEmpty over Count when available | ℹ️ | ⚠️ |
| CA1837 | Use Environment.ProcessId instead of Process.GetCurrentProcess().Id | ℹ️ | ⚠️ |
| CA1838 | Avoid StringBuilder parameters for P/Invokes | 💤 | ⚠️ |
| CA1839 | Use Environment.ProcessPath instead of Process.GetCurrentProcess().MainModule.FileName | ℹ️ | ⚠️ |
| CA1840 | Use Environment.CurrentManagedThreadId instead of Thread.CurrentThread.ManagedThreadId | ℹ️ | ⚠️ |
| CA1841 | Prefer Dictionary Contains methods | ℹ️ | ⚠️ |
| CA1842 | Do not use 'WhenAll' with a single task | ℹ️ | ⚠️ |
| CA1843 | Do not use 'WaitAll' with a single task | ℹ️ | ⚠️ |
| CA1844 | Provide memory-based overrides of async methods when subclassing 'Stream' | ℹ️ | ⚠️ |
| CA1845 | Use span-based 'string.Concat' | ℹ️ | ⚠️ |
| CA1846 | Prefer AsSpan over Substring | ℹ️ | ⚠️ |
| CA1847 | Use String.Contains(char) instead of String.Contains(string) with single characters | ℹ️ | ⚠️ |
| CA1850 | Prefer static HashData method over ComputeHash | ℹ️ | ⚠️ |
| CA1853 | Unnecessary call to 'Dictionary.ContainsKey(key)' | ℹ️ | ⚠️ |
| CA1854 | Prefer the IDictionary.TryGetValue(TKey, out TValue) method | ℹ️ | ⚠️ |
| CA1855 | Use Span | ℹ️ | ⚠️ |
| CA1858 | Use StartsWith instead of IndexOf | ℹ️ | ⚠️ |
| CA1859 | Prefer concrete types when possible for improved performance | ℹ️ | ⚠️ |
| CA1860 | Avoid using 'Enumerable.Any()' extension method | ℹ️ | ⚠️ |
| CA1863 | Use 'CompositeFormat' | 💤 | ⚠️ |
| CA1864 | Prefer the 'IDictionary.TryAdd(TKey, TValue)' method | ℹ️ | ⚠️ |
| CA1865-7 | Use 'string.Method(char)' instead of 'string.Method(string)' for string with single char | ℹ️ | ⚠️ |
| CA1868 | Unnecessary call to 'Contains' for sets | ℹ️ | ⚠️ |
| CA1869 | Cache and reuse 'JsonSerializerOptions' instances | ℹ️ | ⚠️ |
| CA1870 | Use a cached 'SearchValues' instance | ℹ️ | ⚠️ |
| CA1871 | Do not pass a nullable struct to 'ArgumentNullException.ThrowIfNull' | ℹ️ | ⚠️ |
| CA1872 | Prefer 'Convert.ToHexString' and 'Convert.ToHexStringLower' over call chains based on 'BitConverter.ToString' | ℹ️ | ⚠️ |
| CA2009 | Do not call ToImmutableCollection on an ImmutableCollection value | ℹ️ | ⚠️ |
| CA2215 | Dispose methods should call base class dispose | 💤 | ⚠️ |
| CA2218 | Override GetHashCode on overriding Equals | ℹ️ | ⚠️ |
| CA2251 | Use String.Equals over String.Compare | 💤 | ⚠️ |
| CA2264 | Do not pass a non-nullable value to 'ArgumentNullException.ThrowIfNull' | ℹ️ | ⚠️ |
🤝 Contribution
See contribution on the central repository.
🤓 Main contributors
See main contributors on the central repository.