[Bot Framework] Azure Bot Service with QnA Marker

How to make a bot with QnA Marker on Azure and let it speak through Cortana:


Step1. Create a bot service on azure.









Step2. Select the Basic template









Step3. Open Project.json and make sure Microsoft.Bot.Builder.Azure is higher than 3.2.2


{
  "frameworks": {
    "net46":{
      "dependencies": {
        "Microsoft.Bot.Builder.Azure": "3.2.2"
      }
    }
   }
}




Step4. Open EchoDialog.csx






Step5. Override StartAsync to:

	public Task StartAsync(IDialogContext context)
	{
	context.Wait(MessageReceivedAsync);
	return Task.CompletedTask;
	}

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Step6. Override MessageReceivedAsync to process incoming messages and get answer from QnA Maker

	public async Task MessageReceivedAsync(IDialogContext context, IAwaitable<IMessageActivity> argument)
	{
	var message = await argument;
	var respond = await QnAMarkerService.GetQnAMakerResponse(message?.Text);
	var reply = context.MakeMessage();
	reply.Text = $"{respond.Answer}";
	//Make you cortana speak
	reply.Speak = $"{respond.Answer}";
	await context.PostAsync(reply);
	}

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Step7. Add the following code to get answer from QnA Marker

	public class QnAMakerResult
	{
	/// <summary>
	/// The top answer found in the QnA Service.
	/// </summary>
	[JsonProperty(PropertyName = "answer")]
	public string Answer { get; set; }
	/// <summary>
	/// The score in range [0, 100] corresponding to the top answer found in the QnA Service.
	/// </summary>
	[JsonProperty(PropertyName = "score")]
	public double Score { get; set; }
	}
	public class QnAMarkerService
	{
	private static readonly string _knowledgeBaseId = "Your QnA Knowledgebase Id");
	private static readonly string _subscriptionKey = "Your QnA Subscription Key");
	public static async Task<QnAMakerResult> GetQnAMakerResponse(string query)
	{
	var respond = await GetQnAMakerResponse(query, _knowledgeBaseId, _subscriptionKey);
	return respond;
	}
	private static async Task<QnAMakerResult> GetQnAMakerResponse(string query, string knowledgeBaseId, string subscriptionKey)
	{
	string responseString = string.Empty;
	var knowledgebaseId = knowledgeBaseId; // Use knowledge base id created.
	var qnamakerSubscriptionKey = subscriptionKey; //Use subscription key assigned to you.
	//Build the URI
	Uri qnamakerUriBase = new Uri("https://westus.api.cognitive.microsoft.com/qnamaker/v1.0");
	var builder = new UriBuilder($"{qnamakerUriBase}/knowledgebases/{knowledgebaseId}/generateAnswer");
	//Add the question as part of the body
	var postBody = $"{{\"question\": \"{query}\"}}";
	//Send the POST request
	using (WebClient client = new WebClient())
	{
	//Set the encoding to UTF8
	client.Encoding = System.Text.Encoding.UTF8;
	//Add the subscription key header
	client.Headers.Add("Ocp-Apim-Subscription-Key", qnamakerSubscriptionKey);
	client.Headers.Add("Content-Type", "application/json");
	responseString = client.UploadString(builder.Uri, postBody);
	}
	//De-serialize the response
	QnAMakerResult response;
	try
	{
	response = JsonConvert.DeserializeObject<QnAMakerResult>(responseString);
	return response;
	}
	catch
	{
	throw new Exception("Unable to deserialize QnA Maker response string.");
	}
	}
	}

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