c# - 获取错误 : unsupported_grant_type using httpclient to post formdata in asp. 网络控制台应用程序

Question

我找遍了SO都无济于事，仍然没有解决方案。我正在尝试使用 asp.net 控制台应用程序和 httpclient 从第三方服务获取身份验证 token 。在 Postman 中一切正常，但在 C# 中复制相同内容会返回 "{\"error\":\"unsupported_grant_type\"}"

这是我的代码

 using (var httpClient = new HttpClient())
            {
                httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/x-www-form-urlencoded"));

                var multiform = new MultipartFormDataContent()
                {
                    {new StringContent("password"), "grant_type" },
                    {new StringContent("adfadsasdfas"), "username" },
                    {new StringContent("asdfasdadf"), "password" },
                };

                var response = Task.Run(() => httpClient.PostAsync("http://localhost:61216/token", multiform)).Result;

                var message = Task.Run(() => response.Content.ReadAsStringAsync()).Result;

                if (!response.IsSuccessStatusCode)
                {
                    throw new HttpRequestException("Unable to post to cliams manager");
                }

            }

感谢期待...抱歉，我已将 grant_type 更新为密码。它实际上不是 grant_type，因为“密码”也不起作用。

Answer 1

问题似乎出在这部分代码上:

var multiform = new MultipartFormDataContent()
                {
                    {new StringContent("password"), "grant_type" },
                    {new StringContent("adfadsasdfas"), "username" },
                    {new StringContent("asdfasdadf"), "password" },
                };

你应该改用这个:

var content = new FormUrlEncodedContent(
    new KeyValuePair<string, string>[] {
        new KeyValuePair<string, string>("grant_type", "password"),
        new KeyValuePair<string, string>("username", "asdfsad"),
        new KeyValuePair<string, string>("password", "asdfaasdfa")
   }
);