Not working example for Dialogflow V2 api

Question

Experienced problems with C# SDK documentation which can be found here: http://googleapis.github.io/google-cloud-dotnet/docs/Google.Cloud.Dialogflow.V2/api/Google.Cloud.Dialogflow.V2.SessionsClient.html#Google_Cloud_Dialogflow_V2_SessionsClient_Create_Google_Api_Gax_Grpc_ServiceEndpoint_Google_Cloud_Dialogflow_V2_SessionsSettings_

No reference for method ToChannelCredentials(). We cannot connect the SDK to dialogflow, even with blank project. Is this method still existing or deprecated?

using Google.Cloud.Dialogflow.V2;
using Google.Apis.Auth.OAuth2;
using Grpc.Auth;
using Grpc.Core;
...
GoogleCredential cred = GoogleCredential.FromFile("/path/to/credentials.json");
Channel channel = new Channel(
    SessionsClient.DefaultEndpoint.Host, SessionsClient.DefaultEndpoint.Port, cred.ToChannelCredentials());
SessionsClient client = SessionsClient.Create(channel);
...
// Shutdown the channel when it is no longer required.
channel.ShutdownAsync().Wait();

Answer 1

Have you tried connecting using the service account private key ? ( Json file )

Follow these steps (working example in C#)

1. After you create a Dialogflow agent go to the agent's settings --> General --> click on the Service Account link
2. You will be sent to to google cloud platform where you can create a service account
3. After you create a service account, there will be an option to create a KEY , create it and download the (JSON) format of it
4. This key will be used to connect from your C# project to the Dialogflow agent
5. Install Google.Cloud.Dialogflow.V2 package in your project

6. Create for example a Dialogflow manager class (check below for an example)

    public class DialogflowManager { private string _userID; private string _webRootPath; private string _contentRootPath; private string _projectId; private SessionsClient _sessionsClient; private SessionName _sessionName; public DialogflowManager(string userID, string webRootPath, string contentRootPath, string projectId) { _userID = userID; _webRootPath = webRootPath; _contentRootPath = contentRootPath; _projectId = projectId; SetEnvironmentVariable(); } private void SetEnvironmentVariable() { try { Environment.SetEnvironmentVariable("GOOGLE_APPLICATION_CREDENTIALS", _contentRootPath + "\\\\Keys\\\\{THE_DOWNLOADED_JSON_FILE_HERE}.json"); } catch (ArgumentNullException) { throw; } catch (ArgumentException) { throw; } catch (SecurityException) { throw; } } private async Task CreateSession() { // Create client _sessionsClient = await SessionsClient.CreateAsync(); // Initialize request argument(s) _sessionName = new SessionName(_projectId, _userID); } public async Task < QueryResult > CheckIntent(string userInput, string LanguageCode = "en") { await CreateSession(); QueryInput queryInput = new QueryInput(); var queryText = new TextInput(); queryText.Text = userInput; queryText.LanguageCode = LanguageCode; queryInput.Text = queryText; // Make the request DetectIntentResponse response = await _sessionsClient.DetectIntentAsync(_sessionName, queryInput); return response.QueryResult; } }

7. And then this can be called like this for example to get detect Intents

    DialogflowManager dialogflow = new DialogflowManager("{INSERT_USER_ID}", _hostingEnvironment.WebRootPath, _hostingEnvironment.ContentRootPath, "{INSERT_AGENT_ID"); var dialogflowQueryResult = await dialogflow.CheckIntent("{INSERT_USER_INPUT}");