Overview

Classes in the System.Diagnostics.CodeAnalysis namespace are used to analyze code for conformance to coding conventions.

Class	Description
`AllowNullAttribute`	Specifies that null is allowed as an input even if the corresponding type disallows it.
`ConstantExpectedAttribute`	Indicates that the specified method parameter expects a constant.
`DisallowNullAttribute`	Specifies that null is disallowed as an input even if the corresponding type allows it.
`DoesNotReturnAttribute`	Specifies that a method that will never return under any circumstance.
`DoesNotReturnIfAttribute`	Specifies that the method will not return if the associated Boolean parameter is passed the specified value.
`DynamicallyAccessedMembersAttribute`	Indicates that certain members on a specified Type are accessed dynamically, for example, through System.Reflection.
`DynamicDependencyAttribute`	States a dependency that one member has on another.
`ExcludeFromCodeCoverageAttribute`	Specifies that the attributed code should be excluded from code coverage information.
`ExperimentalAttribute`	(C# 12) Allows call sites to be flagged with a diagnostic that indicates an experimental feature was used.
`MaybeNullAttribute`	Specifies that an output may be null even if the corresponding type disallows it.
`MaybeNullWhenAttribute`	Specifies that when a method returns ReturnValue, the parameter may be null even if the corresponding type disallows it.
`MemberNotNullAttribute`	Specifies that the method or property will ensure that the listed field and property members have values that aren’t null.
`MemberNotNullWhenAttribute`	Specifies that the method or property will ensure that the listed field and property members have non-null values when returning with the specified return value condition.
`NotNullAttribute`	Specifies that an output is not null even if the corresponding type allows it. Specifies that an input argument was not null when the call returns.
`NotNullIfNotNullAttribute`	Specifies that the output will be non-null if the named parameter is non-null.
`NotNullWhenAttribute`	Specifies that when a method returns ReturnValue, the parameter will not be null even if the corresponding type allows it.
`RequiresAssemblyFilesAttribute`	Indicates that the specified member requires assembly files to be on disk.
`RequiresDynamicCodeAttribute`	Indicates that the specified method requires the ability to generate new code at runtime, for example through System.Reflection.
`RequiresUnreferencedCodeAttribute`	Indicates that the specified method requires dynamic access to code that is not referenced statically, for example, through System.Reflection.
`SetsRequiredMembersAttribute`	Specifies that this constructor sets all required members for the current type, and callers do not need to set any required members themselves.
`StringSyntaxAttribute`	Specifies the syntax used in a string.
`SuppressMessageAttribute`	Suppresses reporting of a specific code analysis rule violation, allowing multiple suppressions on a single code artifact. Does not apply to compiler diagnostics.
`UnconditionalSuppressMessageAttribute`	Suppresses reporting of a specific rule violation, allowing multiple suppressions on a single code artifact.
`UnscopedRefAttribute`	Used to indicate a byref escapes and is not scoped

StringSyntaxAttribute

Attribute to indicate what kind of syntax is expected in a string.

For example, you can specify that a string parameter expects a regular expression by attributing the parameter with [StringSyntax(StringSyntaxAttribute.Regex)].