System.IO.NetFxToWinRtStreamAdapter.Create C# (CSharp) Méthode

        internal static NetFxToWinRtStreamAdapter Create(Stream stream)
        {
            if (stream == null)
                throw new ArgumentNullException(nameof(stream));

            StreamReadOperationOptimization readOptimization = StreamReadOperationOptimization.AbstractStream;
            if (stream.CanRead)
                readOptimization = DetermineStreamReadOptimization(stream);

            NetFxToWinRtStreamAdapter adapter;

            if (stream.CanSeek)
                adapter = new RandomAccessStream(stream, readOptimization);

            else if (stream.CanRead && stream.CanWrite)
                adapter = new InputOutputStream(stream, readOptimization);

            else if (stream.CanRead)
                adapter = new InputStream(stream, readOptimization);

            else if (stream.CanWrite)
                adapter = new OutputStream(stream, readOptimization);

            else
                throw new ArgumentException(SR.Argument_NotSufficientCapabilitiesToConvertToWinRtStream);

            return adapter;
        }

        private static NetFxToWinRtStreamAdapter AsWindowsRuntimeStreamInternalFactoryHelper(Stream stream)
        {
            Debug.Assert(stream != null);
            Contract.Ensures(Contract.Result <NetFxToWinRtStreamAdapter>() != null);
            Contract.EndContractBlock();

            // Get the adapter for managed stream again (it may have been created concurrently).
            // If none exists yet, create a new one:
            NetFxToWinRtStreamAdapter adapter = s_netFxToWinRtAdapterMap.GetValue(stream, (str) => NetFxToWinRtStreamAdapter.Create(str));

            Debug.Assert(adapter != null);
            adapter.SetWonInitializationRace();

            return(adapter);
        }