How do I request service token with provided client ID and client secret C# winform

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A token indicates which client_id is performing the API call. This token is retrieved using Authentication
Service by supplying client_id and API password as follow:

POST /connect/token HTTP/1.1
Host:www.xxxxxx.com
Content-Type: application/x-www-form-urlencoded
grant_type=client_credentials&client_id=<client_id>&client_secret=<client_secret>

Response

JavaScript

{
 "token_type": "Bearer",
 "access_token":"<access_token>",
 "expires_in": 3600
}

How to take that token from C# WinForms button Click?

What I have tried:

C#

private void SubmitBTN_Click(object sender, EventArgs e)
{
	var client = new RestClient($"https://dummy/api/");
	var request = new RestRequest("Create", Method.POST);
	request.AddHeader("Content-Type", "application/x-www-form-urlencoded");
	request.AddParameter("grant_type", "client_credentials");
	request.AddParameter("client_id", "J<client_id>");
	request.AddParameter("client_secret", "<client_secret>");

	var response = client.Execute(request);
	if (response.StatusCode == System.Net.HttpStatusCode.OK)
	{
		string message = "OK";
		MessageBox.Show(message);
	}
	else
	{
		string message = "Error";
		MessageBox.Show(message);
	}
}

Posted 30-Oct-22 4:53am

lakshanlaki 551

Updated 30-Oct-22 20:41pm

Graeme_Grant

v3

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Comments

Graeme_Grant 31-Oct-22 2:34am

I have formatted your code for you.

I have also removed your API credentials as they are secret and should never be posted publicly. That is like posting your credit card and pin number publicly, you don't do it.

I highly recommend that you cancel your old credentials and get new ones.

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Graeme_Grant · Answer 1 · 2022-10-30T20:41:00

This is a Json response. You need to use a Json deserializer like Newtonsoft.Json or System.Text.Json APIs.

If you are using framework 4.8 or older, or DotNetCore 2.1 or older, then you need to use Newtonsoft.Json. If you are using DotNetCore 3.0, or newer, then System.Text.Json APIs are highly recommended.

If you are not familiar with either of these APIs, then please refer to one or both of these articles for more information:
1. Working with Newtonsoft.Json in C# & VB[^]
2. Working with System.Text.Json in C#[^]

The above articles were written to answer questions like yours, but to also answer most of your future questions as well.

Hope this helps!