RestSharp 发布请求 - 具有 x-www-form-urlencoded 值的正文

我正在使用邮递员并发出 api post 请求，其中我使用 x-www-form-urlencoded 键/值添加正文，并且它在邮递员中工作正常。

当我使用 RestSharp 包从 C# 尝试时，出现了问题。

我已尝试下面的代码但没有得到响应。我收到“BadRequest”invalid_client 错误。

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);

这对我有用，它是邮递员的发电机

        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);