I am writing a facebook bot using MS Bot Framework. I am able to send text replies successfully, but I can't seem to send a picture.
Microsoft has the following example here - http://docs.botframework.com/en-us/csharp/builder/sdkreference/attachments.html
replyMessage.Attachments.Add(new Attachment()
{
ContentUrl = "https://upload.wikimedia.org/wikipedia/en/a/a6/Bender_Rodriguez.png",
ContentType = "image/png",
Name = "Bender_Rodriguez.png"
});
That code doesn't work for me - it throws this error:
Object reference not set to an instance of an object.
Bot_Application1.MessagesController.d__0.MoveNext()
in C:\Users------\Dropbox\code\Bot Application1\Bot
Application1\Controllers\MessagesController.cs:line 92
Line 92 is where I call the .Attachments.Add() method.
I've tried to modify the code to make sure it has no null properties inside, so I added non-null Content and ThumbnailUrl, but this also doesn't work (with or without these two parameters). It's exactly the same error as above when calling the Add() method.
Activity reply3 = activity.CreateReply("blah");
Attachment pic = new Attachment();
pic.ContentUrl = "https://upload.wikimedia.org/wikipedia/en/a/a6/Bender_Rodriguez.png";
pic.ContentType = "image/png";
pic.Name = "Bender_Rodriguez.png";
pic.Content = "Test";
pic.ThumbnailUrl = pic.ContentUrl;
reply3.Attachments.Add(pic);
await connector.Conversations.ReplyToActivityAsync(reply3);
What am I doing wrong?
