RestSharp post request - Body with x-www-form-urlencoded values

I am using postman and making an api post request where I am adding body with x-www-form-urlencoded key/values and it works fine in postman.

The issue arrises when I try it from c# using RestSharp package.

I have tried the following code below but not getting the response. I get "BadRequest" invalid_client error.

public class ClientConfig {
    public string client_id { get; set; } = "value here";
    public string grant_type { get; set; } = "value here";
    public string client_secret { get; set; } = "value here";
    public string scope { get; set; } = "value here";
    public string response_type { get; set; } = "value here";
}

public void GetResponse() {
        var client = new RestClient("api-url-here");
        var req = new RestRequest("endpoint-here",Method.POST);
        var config = new ClientConfig();//values to pass in request

        req.AddHeader("Content-Type","application/x-www-form-urlencoded");
        req.AddParameter("application/x-www-form-urlencoded",config,ParameterType.RequestBody);

        var res = client.Execute(req);
        return;
    }

//Also tried this

    req.AddParameter("client_id",config.client_id,"application/x-www-form-urlencoded",ParameterType.RequestBody);
                req.AddParameter("grant_type",config.grant_type,"application/x-www-form-urlencoded",ParameterType.RequestBody);
                req.AddParameter("client_secret",config.client_secret,"application/x-www-form-urlencoded",ParameterType.RequestBody);
                req.AddParameter("scope",config.scope,ParameterType.RequestBody);
                req.AddParameter("response_type",config.response_type,"application/x-www-form-urlencoded",ParameterType.RequestBody);

//tried this too
var client = new RestClient("url-here");
            var req = new RestRequest("endpointhere",Method.POST);
            var config = new ClientConfig();
req.AddBody(config);
var res = client.Execute(req);

this working for me, it was generator from postman

        var token = new TokenValidation()
        {
               app_id = CloudConfigurationManager.GetSetting("appId"),
               secret = CloudConfigurationManager.GetSetting("secret"),
               grant_type = CloudConfigurationManager.GetSetting("grant_type"),
               Username = CloudConfigurationManager.GetSetting("Username"),
               Password = CloudConfigurationManager.GetSetting("Password"),
        };

        var client = new RestClient($"{xxx}{tokenEndPoint}");
        var request = new RestRequest(Method.POST);
        request.AddHeader("content-type", "application/x-www-form-urlencoded");
        request.AddParameter("application/x-www-form-urlencoded", $"app_id={token.app_id}&secret={token.secret}&grant_type={token.grant_type}&Username={token.Username}&Password={token.Password}", ParameterType.RequestBody);
        IRestResponse response = client.Execute(request);

        if (response.StatusCode != HttpStatusCode.OK)
        {
            Console.WriteLine("Access Token cannot obtain, process terminate");
            return null;
        }

        var tokenResponse = JsonConvert.DeserializeObject<TokenValidationResponse>(response.Content);

I personally find this way to work better for me when sending Form-UrlEncoded data.

public void GetResponse() {
        var client = new RestClient("api-url-here");
        var req = new RestRequest("endpoint-here",Method.POST);
        var config = new ClientConfig();//values to pass in request

        // Content type is not required when adding parameters this way
        // This will also automatically UrlEncode the values
        req.AddParameter("client_id",config.client_id, ParameterType.GetOrPost);
        req.AddParameter("grant_type",config.grant_type, ParameterType.GetOrPost);
        req.AddParameter("client_secret",config.client_secret, ParameterType.GetOrPost);
        req.AddParameter("scope",config.scope, ParameterType.GetOrPost);
        req.AddParameter("response_type",config.response_type, ParameterType.GetOrPost);

        var res = client.Execute(req);
        return;
}

Details on this parameter type can be found here: https://github.com/restsharp/RestSharp/wiki/ParameterTypes-for-RestRequest#getorpost

Personally, I found AddObject() method quite useful, and cleaner when you have so many parameters to add.

public void GetResponse() {
        var client = new RestClient("api-url-here");
        var req = new RestRequest("endpoint-here",Method.POST);
        var config = new ClientConfig();//values to pass in request

        req.AddHeader("Content-Type","application/x-www-form-urlencoded");
        req.AddObject(config);

        var res = client.Execute(req);
        return res;
    }

If it worked on postman, you can just press the code button on the right hand side. This will provide a working example in multiple languages. It is the button above the information icon. I would post a screenshot of it, but I don't have 10 reputation to do so.

in my case this is what worked

req.AddParameter("client_id", "unigen-corporation", ParameterType.HttpHeader);
req.AddParameter("grant_type", "client_credentials", ParameterType.GetOrPost);

If you've copied the code from the postman, try removing the following:

request.AlwaysMultipartFormData = true;

In my case after removing this line code worked.

var client1 = new RestClient(URI);
var request1 = new RestRequest(Method.POST);
request1.AddHeader("Content-Type", "application/x-www-form-urlencoded");
request1.AddParameter("client_id", "XX");
request1.AddParameter("client_secret", "XX");
request1.AddParameter("grant_type", "XX");
request1.AddParameter("role", "XX");
IRestResponse response1 = client1.Execute(request1);
System.Console.WriteLine(response1.Content);

Add parameters according to your needs. This work fine!