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Showing content from https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.codeanalysis.notnullwhenattribute below:

NotNullWhenAttribute Class (System.Diagnostics.CodeAnalysis) | Microsoft Learn

NotNullWhenAttribute Class Definition

Specifies that when a method returns ReturnValue, the parameter will not be null even if the corresponding type allows it.

public ref class NotNullWhenAttribute sealed : Attribute
[System.AttributeUsage(System.AttributeTargets.Parameter, Inherited=false)]
public sealed class NotNullWhenAttribute : Attribute
[<System.AttributeUsage(System.AttributeTargets.Parameter, Inherited=false)>]
type NotNullWhenAttribute = class
    inherit Attribute
Public NotInheritable Class NotNullWhenAttribute
Inherits Attribute
Inheritance
Attributes

For more information, see Nullable static analysis in the C# guide.

Constructors Properties Methods See also

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