Twitter OAuth2-使用WinRT

Question

我有以下代码：

        var oAuthConsumerKey = key;
        var oAuthConsumerSecret = secret;
        var oAuthUri = new Uri("https://api.twitter.com/oauth2/token");

        // Do the Authenticate
        var authHeaderFormat = "Basic {0}";

        var authHeader = string.Format(authHeaderFormat,
            Convert.ToBase64String(Encoding.UTF8.GetBytes(Uri.EscapeDataString(oAuthConsumerKey) + ":" +
            Uri.EscapeDataString((oAuthConsumerSecret)))
        ));

        var postBody = "grant_type=client_credentials";
        //"application/x-www-form-urlencoded;charset=UTF-8"

        var req = new HttpClient();
        req.DefaultRequestHeaders.Add("Authorization", authHeader);

        var c = Convert.ToBase64String(Encoding.UTF8.GetBytes(postBody));
        IHttpContent content = new HttpStringContent(c, Windows.Storage.Streams.UnicodeEncoding.Utf8);

        HttpResponseMessage response = await req.PostAsync(oAuthUri, content);

        IHttpContent responseContent = response.Content;

        using (responseContent)
        {
            var data = await responseContent.ReadAsStringAsync();

我在上面指示的行上得到的错误是这样的：

response.Content = {"errors":  [{"code":170,"label":"forbidden_missing_parameter","message":"Missing required parameter: grant_type"}]}

因此，我的问题是：如何指定“授权类型”参数？

编辑：

按照下面@Jon的建议，我尝试将Grant_type添加到“内容”的构造函数中，但没有区别。

Answer 1

这就是我为其他几个云服务执行的操作。 我从未尝试过Twitter，但是只要授权标头正确，它就应该起作用：

    async Task<HttpResponseMessage> GetToken(string key, string secret)
    {
        var oAuthConsumerKey = key;
        var oAuthConsumerSecret = secret;
        var oAuthUri = new Uri("https://api.twitter.com/oauth2/token");

        HttpClient httpClient = new HttpClient();
        var authHeader = string.Format("Basic {0}",
        Convert.ToBase64String(Encoding.UTF8.GetBytes(Uri.EscapeDataString(oAuthConsumerKey) + ":" +
        Uri.EscapeDataString(oAuthConsumerSecret))));
        httpClient.DefaultRequestHeaders.Add("Authorization", authHeader);

        HttpRequestMessage msg = new HttpRequestMessage(new HttpMethod("POST"), new Uri("https://api.twitter.com/oauth2/token"));
        msg.Content = new StringContent("grant_type=client_credentials");
        msg.Content.Headers.ContentType = new MediaTypeHeaderValue("application/x-www-form-urlencoded");

        HttpResponseMessage response = await httpClient.SendAsync(msg);
        return response;
    }

Answer 2

您是否尝试使用引号设置值？

var postBody = "grant_type=\"client_credentials\"";