电报机器人 - 错误请求:文件必须是非空的

telegram bot - Bad Request: file must be non-empty

我想使用以下代码在 telegram bot 中发送用于 c# 版本 15.7.1 的文本文件:

            var csvFile = new StringBuilder();
            foreach ( var person in persons)
            {
                var output = new List<string>
                {
                    person.Fardi.Name,
                    person.Fardi.LastName,
                    person.Fardi.PhoneNumber,
                    person.Fardi.BrithYear.ToString(),
                    person.Fardi.Father
                };
                csvFile.AppendLine(string.Join(_delimiter, output));
            }
            using var stream = new MemoryStream();
            using var streamWriter = new StreamWriter(stream, Encoding.UTF8);
            await streamWriter.WriteAsync(csvFile.ToString());
            await streamWriter.FlushAsync();
            await _botClient.SendDocumentAsync(new ChatId(chatId), new InputOnlineFile(stream, "test.txt"), replyMarkup: GetInlineKeyboard(buttons));

但是当我发送请求时,出现了这个错误:

Error while sending message
      Telegram.Bot.Exceptions.ApiRequestException: Bad Request: file must be non-empty
        at Telegram.Bot.TelegramBotClient.MakeRequestAsync[TResponse](IRequest`1 request, CancellationToken cancellationToken)

但是我的流不是空的,它的长度是 200。

我不知道 telegram bot 是什么,但是修复可能就像用 [=13] 倒带 stream 一样简单=]

Gets or sets the current position within the stream.

using var stream = new MemoryStream();
...
stream.Position = 0;
await _botClient.SendDocumentAsync(
    new ChatId(chatId), 
    new InputOnlineFile(stream, "test.txt"), 
    replyMarkup: GetInlineKeyboard(buttons));