How can I get my oauth token to generate using dictionary in restsharp

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I am trying to get my OAuth token but getting a Bad request. I am trying to use Dictionary to store in key pair values but its not working.
I have successfully send request using another library using HttpWebResponse and when I check in fidler I get this when I check the raw response..

grant_type=password&username=client@company.com&password=pass&scope=scope1&client_id=api&client_secret=rest

But when I used RestSharp and Execute my code I checked in fidler I get 400 bad request and I see the credential pass as this. How can resolve this??

{"grant_type":"password","username":"client@company.com","password":"pass","scope":"scope1","client_id":"api","client_secret":"rest"}

What I have tried:

Here is my code

[Test]
public void getAccessToken1()
{
    Dictionary<string, string> formParams = new Dictionary<string, string>();
    formParams.Add("grant_type", "password");
    formParams.Add("username", "client@company.com");
    formParams.Add("password", "pass");
    formParams.Add("scope", "scope1");
    formParams.Add("client_id", "api");
    formParams.Add("client_secret", "rest");

    RestClient client = new RestClient("http://example.com/connect/token");
    RestRequest request = new RestRequest() { Method = Method.POST };
    request.AddJsonBody(formParams);
    IRestResponse token = client.Execute(request);


}

Posted 11-May-20 17:48pm

Member 14779968

Updated 12-May-20 0:53am

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Richard Deeming · Accepted Answer · 2020-05-12T00:53:00

You're looking at the request, not the response.

The request which succeeds is sending the parameters encoded as application/x-www-form-urlencoded. The request that fails is sending the parameters encoded as JSON.

You need to add the parameters to the RestRequest object instead of using AddJsonBody:

C#

RestClient client = new RestClient("http://example.com/connect/token");
RestRequest request = new RestRequest() { Method = Method.POST };

request.AddParameter("grant_type", "password", ParameterType.GetOrPost);
request.AddParameter("username", "client@company.com", ParameterType.GetOrPost);
request.AddParameter("password", "pass", ParameterType.GetOrPost);
request.AddParameter("scope", "scope1", ParameterType.GetOrPost);
request.AddParameter("client_id", "api", ParameterType.GetOrPost);
request.AddParameter("client_secret", "rest", ParameterType.GetOrPost);

IRestResponse token = client.Execute(request);

Request Parameters | RestSharp[^]
c# - RestSharp post request - Body with x-www-form-urlencoded values - Stack Overflow[^]