Question

我正在写一个机器人并期望用户向我发送一份附件，我想阅读并翻译成对象。

到目前为止，我有以下代码：

if (message.Attachments != null && message.Attachments.Any())
{
    var attachment = message.Attachments.First();
    using (HttpClient httpClient = new HttpClient())
    {
        if ((message.ChannelId.Equals("skype", StringComparison.InvariantCultureIgnoreCase) || message.ChannelId.Equals("msteams", StringComparison.InvariantCultureIgnoreCase)) && new Uri(attachment.ContentUrl).Host.EndsWith("skype.com"))
        {
            var token = await new MicrosoftAppCredentials().GetTokenAsync();
            httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);
        }

        var responseMessage = await httpClient.GetAsync(attachment.ContentUrl); 
        var contentLenghtBytes = responseMessage.Content.Headers.ContentLength; // this is populated correctly

        if(attachment.Name.ToLower().Equals("opportunity.xlsx"))
        {
            var temp = attachment.Content; // This Content is always null, even though everything else is populated.
        }
    }
}

任何人都可以建议我如何阅读附件xlsx内容？

谢谢

Answer 1

Content属性中没有附件。首先需要使用ContentUrl下载附件，然后在下载文件后使用响应消息执行任何操作。

查看Receive-Attachments C＃示例。

public virtual async Task MessageReceivedAsync(IDialogContext context, IAwaitable<IMessageActivity> argument)
{
    var message = await argument;

    if (message.Attachments != null && message.Attachments.Any())
    {
        var attachment = message.Attachments.First();
        using (HttpClient httpClient = new HttpClient())
        {
            // Skype & MS Teams attachment URLs are secured by a JwtToken, so we need to pass the token from our bot.
            if ((message.ChannelId.Equals("skype", StringComparison.InvariantCultureIgnoreCase) || message.ChannelId.Equals("msteams", StringComparison.InvariantCultureIgnoreCase)) 
                && new Uri(attachment.ContentUrl).Host.EndsWith("skype.com"))
            {
                var token = await new MicrosoftAppCredentials().GetTokenAsync();
                httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);
            }

            var responseMessage = await httpClient.GetAsync(attachment.ContentUrl);

            var contentLenghtBytes = responseMessage.Content.Headers.ContentLength;

            await context.PostAsync($"Attachment of {attachment.ContentType} type and size of {contentLenghtBytes} bytes received.");
        }
    }
    else
    {
        await context.PostAsync("Hi there! I'm a bot created to show you how I can receive message attachments, but no attachment was sent to me. Please, try again sending a new message including an attachment.");
    }

    context.Wait(this.MessageReceivedAsync);
}

Answer 2

如果这是你的意思，你将不得不使用其他一些dll来读取excel数据。你是想在升级后阅读excel文件的内容然后你可以使用https://github.com/ExcelDataReader/ExcelDataReader

如何从机器人框架C＃中读取附件内容？

2 个答案: