小编Tat*_*ana的帖子

我正在尝试使用此代码段将内容传输到便携式设备

IPortableDeviceValues values =
            GetRequiredPropertiesForContentType(fileName, parentObjectId);

        IStream tempStream;
        uint optimalTransferSizeBytes = 0;

        content.CreateObjectWithPropertiesAndData(
            values,
            out tempStream,
            ref optimalTransferSizeBytes,
            null);

        System.Runtime.InteropServices.ComTypes.IStream targetStream =
            (System.Runtime.InteropServices.ComTypes.IStream)tempStream;

        try
        {
            using (var sourceStream =
                   new FileStream(fileName, FileMode.Open, FileAccess.Read))
            {
                var buffer = new byte[optimalTransferSizeBytes];
                int bytesRead;
                do
                {
                    bytesRead = sourceStream.Read(
                        buffer, 0, (int)optimalTransferSizeBytes);
                    IntPtr pcbWritten = IntPtr.Zero;
                    if (bytesRead < (int)optimalTransferSizeBytes)
                    {
                        targetStream.Write(buffer, bytesRead, pcbWritten);
                    }
                    else
                    {
                        targetStream.Write(buffer, (int)optimalTransferSizeBytes, pcbWritten);
                    }

                } while (bytesRead > 0);
            }
            targetStream.Commit(0);
        }
        finally
        {
            System.Runtime.InteropServices.Marshal.ReleaseComObject(tempStream);
        } …