How to build a chatbot using .NET Core and dialogflow?

Question

I'm building my own MVC web application using .NET Core and I want to add a chatbot application in my website.

In my point of view, after building an agent in dialogflow, and then I should can use webhook to let my C# application to connect to the agent which already exists and push request to it and get response from the agent.

How can I connect .NET Core client to dialogflow agent which already exists or may be some reference?

Answer 1

It's fairly easy. Follow the instructions below :

1. Install Nuget package Google.Apis.Dialogflow.v2 and its dependencies.
2. Create the GCP credentials access key. Save the JSON to your local machine.

3. Connect to GCP by setting-up the environment variable GOOGLE_APPLICATION_CREDENTIALS. Refer the following code : System.Environment.SetEnvironmentVariable("GOOGLE_APPLICATION_CREDENTIALS", _CredentialsPath) :

4. Use following like code to

   Public Function GetResponseTo(whatUserSays As String) As String

       Dim textInput As New TextInput, queryInput As New QueryInput
   
       textInput.Text = whatUserSays
       textInput.LanguageCode = "en"
       queryInput.Text = textInput
   
       _Response = _Client.DetectIntent(New SessionName("newagent-12345", _SessionId), queryInput).QueryResult.FulfillmentText
   
       Debug.Print(_Response)
   
       Return _Response
   
   End Function
   

where - queryInput contains the text typed by the user.