FileControlHelperDownloadContentAsync - метод

Public Shared Function DownloadContentAsync ( 
	operationFiles As IReadOnlyCollection(Of IFileObject),
	Optional controlToResetPreview As IFileControl = Nothing,
	Optional cancellationToken As CancellationToken = Nothing
) As Task(Of ( As List(Of String),  As ValidationResult))

public:
static Task<ValueTuple<List<String^>^, ValidationResult^>>^ DownloadContentAsync(
	IReadOnlyCollection<IFileObject^>^ operationFiles, 
	IFileControl^ controlToResetPreview = nullptr, 
	CancellationToken cancellationToken = CancellationToken()
)

static member DownloadContentAsync : 
        operationFiles : IReadOnlyCollection<IFileObject> * 
        ?controlToResetPreview : IFileControl * 
        ?cancellationToken : CancellationToken 
(* Defaults:
        let _controlToResetPreview = defaultArg controlToResetPreview null
        let _cancellationToken = defaultArg cancellationToken new CancellationToken()
*)
-> Task<ValueTuple<List<string>, ValidationResult>>