how to call my api qnamaker using Microsoft.Azure.CognitiveServices.Knowledge.QnAMaker nuget version 1.0.0 - qnamaker

Question

I am getting started with Microsoft.Azure.CognitiveServices.Knowledge.QnAMaker nuget,
and I am trying to use QnAMakerClient() class to initialise a new instance of the QNAMakerClient class.
But this class takes abstract parameters :
public QnAMakerClient(ServiceClientCredentials credentials, params DelegatingHandler[] handlers).
I found some solution
https://csharp.hotexamples.com/examples/Microsoft.Rest/TokenCredentials/-/php-tokencredentials-class-examples.html which indicates how to get the credentials token.
As I am new to this concept, so I don't know how to get credentials token for my ServiceClientCredentials.

Answer 1

You can create your own TokenCredentials class which inherit from ServiceClientCredentials as shown below:
public class TokenCredentials : ServiceClientCredentials
{
/// <summary>
/// The bearer token type, as serialized in an http Authentication header.
/// </summary>
private const string BearerTokenType = "Bearer";
/// <summary>
/// Gets or sets secure token used to authenticate against Microsoft Azure API.
/// No anonymous requests are allowed.
/// </summary>
protected ITokenProvider TokenProvider { get; private set; }
/// <summary>
/// Initializes a new instance of the <see cref="TokenCredentials"/>
/// class with the given 'Bearer' token.
/// </summary>
/// <param name="token">Valid JSON Web Token (JWT).</param>
public TokenCredentials(string token)
: this(token, BearerTokenType)
{
}
/// <summary>
/// Initializes a new instance of the <see cref="TokenCredentials"/>
/// class with the given token and token type.
/// </summary>
/// <param name="token">Valid JSON Web Token (JWT).</param>
/// <param name="tokenType">The token type of the given token.</param>
public TokenCredentials(string token, string tokenType)
: this(new StringTokenProvider(token, tokenType))
{
if (string.IsNullOrEmpty(token))
{
throw new ArgumentNullException("token");
}
if (string.IsNullOrEmpty(tokenType))
{
throw new ArgumentNullException("tokenType");
}
}
/// <summary>
/// Create an access token credentials object, given an interface to a token source.
/// </summary>
/// <param name="tokenProvider">The source of tokens for these credentials.</param>
public TokenCredentials(ITokenProvider tokenProvider)
{
if (tokenProvider == null)
{
throw new ArgumentNullException("tokenProvider");
}
this.TokenProvider = tokenProvider;
}
/// <summary>
/// Apply the credentials to the HTTP request.
/// </summary>
/// <param name="request">The HTTP request.</param>
/// <param name="cancellationToken">Cancellation token.</param>
/// <returns>
/// Task that will complete when processing has completed.
/// </returns>
public async override Task ProcessHttpRequestAsync(HttpRequestMessage request,
CancellationToken cancellationToken)
{
if (request == null)
{
throw new ArgumentNullException("request");
}
if (TokenProvider == null)
{
throw new InvalidOperationException(Resources.TokenProviderCannotBeNull);
}
request.Headers.Authorization = await TokenProvider.GetAuthenticationHeaderAsync(cancellationToken);
await base.ProcessHttpRequestAsync(request, cancellationToken);
}
}
This is a good starting point for knowing more about QnAMaker.
Hope this helps!!!