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meziantou / Meziantou.Analyzer

A Roslyn analyzer to enforce some good practices in C#.
MIT License
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analyzer csharp dotnet hacktoberfest roslyn roslyn-analyzer static-analysis vsix

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Meziantou.Analyzer

Meziantou.Analyzer on NuGet Meziantou.Analyzer on NuGet

A Roslyn analyzer to enforce some good practices in C# in terms of design, usage, security, performance, and style.

Installation

Install the NuGet package https://www.nuget.org/packages/Meziantou.Analyzer/

Rules

If you are already using other analyzers, you can check which rules are duplicated with well-known analyzers

Id Category Description Severity Is enabled Code fix
MA0001 Usage StringComparison is missing ℹ️ ✔️ ✔️
MA0002 Usage IEqualityComparer\<string> or IComparer\<string> is missing ⚠️ ✔️ ✔️
MA0003 Style Add parameter name to improve readability ℹ️ ✔️ ✔️
MA0004 Usage Use Task.ConfigureAwait ⚠️ ✔️ ✔️
MA0005 Performance Use Array.Empty\<T>() ⚠️ ✔️ ✔️
MA0006 Usage Use String.Equals instead of equality operator ⚠️ ✔️ ✔️
MA0007 Style Add a comma after the last value ℹ️ ✔️ ✔️
MA0008 Performance Add StructLayoutAttribute ⚠️ ✔️ ✔️
MA0009 Security Add regex evaluation timeout ⚠️ ✔️ ❌
MA0010 Design Mark attributes with AttributeUsageAttribute ⚠️ ✔️ ✔️
MA0011 Usage IFormatProvider is missing ⚠️ ✔️ ❌
MA0012 Design Do not raise reserved exception type ⚠️ ✔️ ❌
MA0013 Design Types should not extend System.ApplicationException ⚠️ ✔️ ❌
MA0014 Design Do not raise System.ApplicationException type ⚠️ ✔️ ❌
MA0015 Usage Specify the parameter name in ArgumentException ⚠️ ✔️ ❌
MA0016 Design Prefer using collection abstraction instead of implementation ⚠️ ✔️ ❌
MA0017 Design Abstract types should not have public or internal constructors ⚠️ ✔️ ✔️
MA0018 Design Do not declare static members on generic types (deprecated; use CA1000 instead) ℹ️ ✔️ ❌
MA0019 Usage Use EventArgs.Empty ⚠️ ✔️ ✔️
MA0020 Performance Use direct methods instead of LINQ methods ℹ️ ✔️ ✔️
MA0021 Usage Use StringComparer.GetHashCode instead of string.GetHashCode ⚠️ ✔️ ✔️
MA0022 Design Return Task.FromResult instead of returning null ⚠️ ✔️ ✔️
MA0023 Performance Add RegexOptions.ExplicitCapture ⚠️ ✔️ ❌
MA0024 Usage Use an explicit StringComparer when possible ⚠️ ✔️ ✔️
MA0025 Design Implement the functionality instead of throwing NotImplementedException ⚠️ ✔️ ❌
MA0026 Design Fix TODO comment ⚠️ ✔️ ❌
MA0027 Usage Prefer rethrowing an exception implicitly ⚠️ ✔️ ✔️
MA0028 Performance Optimize StringBuilder usage ℹ️ ✔️ ✔️
MA0029 Performance Combine LINQ methods ℹ️ ✔️ ✔️
MA0030 Performance Remove useless OrderBy call ⚠️ ✔️ ✔️
MA0031 Performance Optimize Enumerable.Count() usage ℹ️ ✔️ ✔️
MA0032 Usage Use an overload with a CancellationToken argument ℹ️ ❌ ❌
MA0033 Design Do not tag instance fields with ThreadStaticAttribute ⚠️ ✔️ ❌
MA0035 Usage Do not use dangerous threading methods ⚠️ ✔️ ❌
MA0036 Design Make class static ℹ️ ✔️ ✔️
MA0037 Usage Remove empty statement ❌ ✔️ ✔️
MA0038 Design Make method static (deprecated, use CA1822 instead) ℹ️ ✔️ ✔️
MA0039 Security Do not write your own certificate validation method ❌ ✔️ ❌
MA0040 Usage Forward the CancellationToken parameter to methods that take one ℹ️ ✔️ ✔️
MA0041 Design Make property static (deprecated, use CA1822 instead) ℹ️ ✔️ ✔️
MA0042 Design Do not use blocking calls in an async method ℹ️ ✔️ ✔️
MA0043 Usage Use nameof operator in ArgumentException ℹ️ ✔️ ✔️
MA0044 Performance Remove useless ToString call ℹ️ ✔️ ✔️
MA0045 Design Do not use blocking calls in a sync method (need to make calling method async) ℹ️ ❌ ✔️
MA0046 Design Use EventHandler\<T> to declare events ⚠️ ✔️ ❌
MA0047 Design Declare types in namespaces ⚠️ ✔️ ❌
MA0048 Design File name must match type name ⚠️ ✔️ ❌
MA0049 Design Type name should not match containing namespace ❌ ✔️ ❌
MA0050 Design Validate arguments correctly in iterator methods ℹ️ ✔️ ✔️
MA0051 Design Method is too long ⚠️ ✔️ ❌
MA0052 Performance Replace constant Enum.ToString with nameof ℹ️ ✔️ ✔️
MA0053 Design Make class sealed ℹ️ ✔️ ✔️
MA0054 Design Embed the caught exception as innerException ⚠️ ✔️ ❌
MA0055 Design Do not use finalizer ⚠️ ✔️ ❌
MA0056 Design Do not call overridable members in constructor ⚠️ ✔️ ❌
MA0057 Naming Class name should end with 'Attribute' ℹ️ ✔️ ❌
MA0058 Naming Class name should end with 'Exception' ℹ️ ✔️ ❌
MA0059 Naming Class name should end with 'EventArgs' ℹ️ ✔️ ❌
MA0060 Design The value returned by Stream.Read/Stream.ReadAsync is not used ⚠️ ✔️ ❌
MA0061 Design Method overrides should not change default values ⚠️ ✔️ ✔️
MA0062 Design Non-flags enums should not be marked with "FlagsAttribute" ⚠️ ✔️ ❌
MA0063 Performance Use Where before OrderBy ℹ️ ✔️ ❌
MA0064 Design Avoid locking on publicly accessible instance ⚠️ ✔️ ❌
MA0065 Performance Default ValueType.Equals or HashCode is used for struct equality ⚠️ ✔️ ❌
MA0066 Performance Hash table unfriendly type is used in a hash table ⚠️ ✔️ ❌
MA0067 Design Use Guid.Empty ℹ️ ✔️ ✔️
MA0068 Design Invalid parameter name for nullable attribute ⚠️ ✔️ ❌
MA0069 Design Non-constant static fields should not be visible ⚠️ ✔️ ❌
MA0070 Design Obsolete attributes should include explanations ⚠️ ✔️ ❌
MA0071 Style Avoid using redundant else ℹ️ ✔️ ✔️
MA0072 Design Do not throw from a finally block ⚠️ ✔️ ❌
MA0073 Style Avoid comparison with bool constant ℹ️ ✔️ ✔️
MA0074 Usage Avoid implicit culture-sensitive methods ⚠️ ✔️ ✔️
MA0075 Design Do not use implicit culture-sensitive ToString ℹ️ ✔️ ❌
MA0076 Design Do not use implicit culture-sensitive ToString in interpolated strings ℹ️ ✔️ ❌
MA0077 Design A class that provides Equals(T) should implement IEquatable\<T> ⚠️ ✔️ ✔️
MA0078 Performance Use 'Cast' instead of 'Select' to cast ℹ️ ✔️ ✔️
MA0079 Usage Forward the CancellationToken using .WithCancellation() ℹ️ ✔️ ✔️
MA0080 Usage Use a cancellation token using .WithCancellation() ℹ️ ❌ ❌
MA0081 Design Method overrides should not omit params keyword ⚠️ ✔️ ✔️
MA0082 Design NaN should not be used in comparisons ⚠️ ✔️ ❌
MA0083 Design ConstructorArgument parameters should exist in constructors ⚠️ ✔️ ❌
MA0084 Design Local variables should not hide other symbols ⚠️ ✔️ ❌
MA0085 Usage Anonymous delegates should not be used to unsubscribe from Events ⚠️ ✔️ ❌
MA0086 Design Do not throw from a finalizer ⚠️ ✔️ ❌
MA0087 Design Parameters with [DefaultParameterValue] attributes should also be marked [Optional] ⚠️ ✔️ ❌
MA0088 Design Use [DefaultParameterValue] instead of [DefaultValue] ⚠️ ✔️ ❌
MA0089 Performance Optimize string method usage ℹ️ ✔️ ✔️
MA0090 Design Remove empty else/finally block ℹ️ ✔️ ❌
MA0091 Usage Sender should be 'this' for instance events ⚠️ ✔️ ✔️
MA0092 Usage Sender should be 'null' for static events ⚠️ ✔️ ❌
MA0093 Usage EventArgs should not be null ⚠️ ✔️ ✔️
MA0094 Design A class that provides CompareTo(T) should implement IComparable\<T> ⚠️ ✔️ ❌
MA0095 Design A class that implements IEquatable\<T> should override Equals(object) ⚠️ ✔️ ❌
MA0096 Design A class that implements IComparable\<T> should also implement IEquatable\<T> ⚠️ ✔️ ❌
MA0097 Design A class that implements IComparable\<T> or IComparable should override comparison operators ⚠️ ✔️ ❌
MA0098 Performance Use indexer instead of LINQ methods ℹ️ ✔️ ✔️
MA0099 Usage Use Explicit enum value instead of 0 ⚠️ ✔️ ❌
MA0100 Usage Await task before disposing of resources ⚠️ ✔️ ❌
MA0101 Usage String contains an implicit end of line character 👻 ✔️ ✔️
MA0102 Design Make member readonly ℹ️ ✔️ ✔️
MA0103 Usage Use SequenceEqual instead of equality operator ⚠️ ✔️ ✔️
MA0104 Design Do not create a type with a name from the BCL ⚠️ ❌ ❌
MA0105 Performance Use the lambda parameters instead of using a closure ℹ️ ✔️ ❌
MA0106 Performance Avoid closure by using an overload with the 'factoryArgument' parameter ℹ️ ✔️ ❌
MA0107 Design Do not use culture-sensitive object.ToString ℹ️ ❌ ❌
MA0108 Usage Remove redundant argument value ℹ️ ✔️ ✔️
MA0109 Design Consider adding an overload with a Span\<T> or Memory\<T> ℹ️ ❌ ❌
MA0110 Performance Use the Regex source generator ℹ️ ✔️ ✔️
MA0111 Performance Use string.Create instead of FormattableString ℹ️ ✔️ ✔️
MA0112 Performance Use 'Count > 0' instead of 'Any()' ℹ️ ❌ ❌
MA0113 Design Use DateTime.UnixEpoch ℹ️ ✔️ ✔️
MA0114 Design Use DateTimeOffset.UnixEpoch ℹ️ ✔️ ✔️
MA0115 Usage Unknown component parameter ⚠️ ✔️ ❌
MA0116 Design Parameters with [SupplyParameterFromQuery] attributes should also be marked as [Parameter] ⚠️ ✔️ ✔️
MA0117 Design Parameters with [EditorRequired] attributes should also be marked as [Parameter] ⚠️ ✔️ ✔️
MA0118 Design [JSInvokable] methods must be public ⚠️ ✔️ ❌
MA0119 Design JSRuntime must not be used in OnInitialized or OnInitializedAsync ⚠️ ✔️ ❌
MA0120 Performance Use InvokeVoidAsync when the returned value is not used ℹ️ ✔️ ✔️
MA0121 Design Do not overwrite parameter value ℹ️ ❌ ❌
MA0122 Design Parameters with [SupplyParameterFromQuery] attributes are only valid in routable components (@page) ℹ️ ✔️ ❌
MA0123 Design Sequence number must be a constant ⚠️ ✔️ ❌
MA0124 Design Log parameter type is not valid ⚠️ ✔️ ❌
MA0125 Design The list of log parameter types contains an invalid type ⚠️ ✔️ ❌
MA0126 Design The list of log parameter types contains a duplicate ⚠️ ✔️ ❌
MA0127 Usage Use String.Equals instead of is pattern ⚠️ ❌ ❌
MA0128 Usage Use 'is' operator instead of SequenceEqual ℹ️ ✔️ ✔️
MA0129 Usage Await task in using statement ⚠️ ✔️ ❌
MA0130 Usage GetType() should not be used on System.Type instances ⚠️ ✔️ ❌
MA0131 Usage ArgumentNullException.ThrowIfNull should not be used with non-nullable types ⚠️ ✔️ ❌
MA0132 Design Do not convert implicitly to DateTimeOffset ⚠️ ✔️ ❌
MA0133 Design Use DateTimeOffset instead of relying on the implicit conversion ℹ️ ✔️ ❌
MA0134 Usage Observe result of async calls ⚠️ ✔️ ❌
MA0135 Design The log parameter has no configured type ⚠️ ❌ ❌
MA0136 Usage Raw String contains an implicit end of line character 👻 ✔️ ❌
MA0137 Design Use 'Async' suffix when a method returns an awaitable type ⚠️ ❌ ❌
MA0138 Design Do not use 'Async' suffix when a method does not return an awaitable type ⚠️ ❌ ❌
MA0139 Design Log parameter type is not valid ⚠️ ✔️ ❌
MA0140 Design Both if and else branch have identical code ⚠️ ✔️ ❌
MA0141 Usage Use pattern matching instead of inequality operators for null check ℹ️ ❌ ✔️
MA0142 Usage Use pattern matching instead of equality operators for null check ℹ️ ❌ ✔️
MA0143 Design Primary constructor parameters should be readonly ⚠️ ✔️ ❌
MA0144 Performance Use System.OperatingSystem to check the current OS ⚠️ ✔️ ❌
MA0145 Usage Signature for [UnsafeAccessorAttribute] method is not valid ⚠️ ✔️ ❌
MA0146 Usage Name must be set explicitly on local functions ⚠️ ✔️ ❌
MA0147 Usage Avoid async void method for delegate ⚠️ ✔️ ❌
MA0148 Usage Use pattern matching instead of equality operators for discrete value ℹ️ ❌ ✔️
MA0149 Usage Use pattern matching instead of inequality operators for discrete value ℹ️ ❌ ✔️
MA0150 Design Do not call the default object.ToString explicitly ⚠️ ✔️ ❌
MA0151 Usage DebuggerDisplay must contain valid members ⚠️ ✔️ ❌
MA0152 Performance Use Unwrap instead of using await twice ℹ️ ✔️ ❌
MA0153 Design Do not log symbols decorated with DataClassificationAttribute directly ⚠️ ✔️ ❌
MA0154 Design Use langword in XML comment ℹ️ ✔️ ✔️
MA0155 Design Do not use async void methods ⚠️ ❌ ❌
MA0156 Design Use 'Async' suffix when a method returns IAsyncEnumerable\<T> ⚠️ ❌ ❌
MA0157 Design Do not use 'Async' suffix when a method does not return IAsyncEnumerable\<T> ⚠️ ❌ ❌
MA0158 Performance Use System.Threading.Lock ⚠️ ✔️ ❌
MA0159 Performance Use 'Order' instead of 'OrderBy' ℹ️ ✔️ ✔️
MA0160 Performance Use ContainsKey instead of TryGetValue ℹ️ ✔️ ❌
MA0161 Usage UseShellExecute must be explicitly set ℹ️ ❌ ❌
MA0162 Usage Use Process.Start overload with ProcessStartInfo ℹ️ ❌ ❌
MA0163 Usage UseShellExecute must be false when redirecting standard input or output ⚠️ ✔️ ❌
MA0164 Style Use parentheses to make not pattern clearer ⚠️ ✔️ ✔️
MA0165 Usage Make interpolated string 👻 ✔️ ✔️

Suppressions

Id Suppressed rule Justification
MAS0001 CA1822 Suppress CA1822 on methods decorated with BenchmarkDotNet attributes.
MAS0002 CA1822 Suppress CA1822 on methods decorated with a System.Text.Json attribute such as [JsonPropertyName] or [JsonInclude].
MAS0003 IDE0058 Suppress IDE0058 on well-known types