excel - How to read attachment content from bot framework C#? -


i writing bot , expecting user send me attachment, want read , translate objects.

i have following code far:

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; // populated correctly          if(attachment.name.tolower().equals("opportunity.xlsx"))         {             var temp = attachment.content; // content null, though else populated.         }     } }

anyone can suggest how can read attachment xlsx content please?

thanks

the attachment not available in content property. first need download attachment using contenturl , perform whatever want, using response message after downloading file.

take @ receive-attachments c# sample.

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 secured jwttoken, need pass token 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 , size of {contentlenghtbytes} bytes received.");         }     }     else     {         await context.postasync("hi there! i'm bot created show how can receive message attachments, no attachment sent me. please, try again sending new message including attachment.");     }      context.wait(this.messagereceivedasync); }

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