Windows.Storage.Streams.DataReader.ReadDateTime C# (CSharp) Method

		public DateTimeOffset ReadDateTime()
		{
			throw new NotImplementedException();
		}

        private async void OnRead(Object sender, RoutedEventArgs e)
        {
            StorageFolder local = ApplicationData.Current.LocalFolder;

            StorageFile file = await local.GetFileAsync("demo.dat");
            if(file != null)
            {
                string strres = "读到的内容：\n";
                using(IRandomAccessStream stream = await file.OpenReadAsync())
                {
                    DataReader dr = new DataReader(stream);
                    dr.UnicodeEncoding = UnicodeEncoding.Utf8;
                    await dr.LoadAsync((uint)stream.Size);
                    bool b = dr.ReadBoolean();
                    strres += b.ToString() + "\n";
                    DateTimeOffset dt = dr.ReadDateTime();
                    strres += dt.ToString("yyyy-M-d") + "\n";
                    uint len = dr.ReadUInt32();
                    if(len > 0)
                    {
                        strres += dr.ReadString(len);
                    }
                    dr.Dispose();
                }
                tbResult.Text = strres;
            }
        }