System.Diagnostics.CodeAnalysis.NotNullWhenAttribute

sealed class NotNullWhenAttribute : Attribute

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

/* System.InvalidOperationException: Cannot replace the root node at ICSharpCode.Decompiler.CSharp.Syntax.AstNode.ReplaceWith(AstNode newNode) at ICSharpCode.Decompiler.CSharp.Syntax.DepthFirstAstVisitor.VisitChildren(AstNode node) at ICSharpCode.Decompiler.CSharp.Syntax.DepthFirstAstVisitor.VisitChildren(AstNode node) at ICSharpCode.Decompiler.CSharp.Transforms.IntroduceUsingDeclarations.FullyQualifyAmbiguousTypeNamesVisitor.VisitTypeDeclaration(TypeDeclaration typeDeclaration) at ICSharpCode.Decompiler.CSharp.Transforms.IntroduceUsingDeclarations.FullyQualifyAmbiguousTypeNamesVisitor.VisitNamespaceDeclaration(NamespaceDeclaration namespaceDeclaration) at ICSharpCode.Decompiler.CSharp.Transforms.IntroduceUsingDeclarations.Run(AstNode rootNode, TransformContext context) at ICSharpCode.Decompiler.CSharp.CSharpDecompiler.RunTransforms(AstNode rootNode, DecompileRun decompileRun, ITypeResolveContext decompilationContext) at ICSharpCode.Decompiler.CSharp.CSharpDecompiler.DecompileType(FullTypeName fullTypeName) at Relativity.APIReference.TypeDocumentation.b__30_0() in C:\Dev\relativity.apireference\Data\TypeDocumentation.cs:line 270 */