C# 请确认它是url编码的正文。请检查您发布的json数据。这不是您在代码中发送的重定向uri，它们必须相同。根据链接，我已将重定向uri更改为“urn:ietf:wg:oauth:2.0:oob”。另外，我发现数据不是url编码的，它必须是json。因此，使

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请确认它是url编码的正文。请检查您发布的json数据。这不是您在代码中发送的重定向uri，它们必须相同。根据链接，我已将重定向uri更改为“urn:ietf:wg:oauth:2.0:oob”。另外，我发现数据不是url编码的，它必须是json。因此，使用newtonsoft.json重新打包代码，生成以下输出。“{”client\u code\：“4/sZ7URBc5qJ6vYt5t3dLz\u xyZH-r-ptZdxCZTkx9hdYo\”，“client\u id\”：“755933294823-t0afvat7k75c49io03o8c0noer7m9.apps.googleusercontent.com\，“client\u secret\”：“9e1jlc1tawra4xzzxxt2h2h\，“redirect\uURI:”OAuth2w:Outh\，“grant.com\”类型：“：”grant\”grant授权代码\“}”。但还是一样的问题@戴姆托。400个错误的请求。我遗漏了什么吗？你不是在使用json文件吗？你是在用一种很难做到的方式。阅读我发送给你的第一个链接，它将引导你了解每个请求的外观，如果你在我的网站上停留足够长的时间，你可能会找到一篇关于如何做到这一点的帖子。我在某个地方有一篇关于这一点的很老的帖子。

{"installed":{"client_id":"xxxx","auth_uri":"https://accounts.google.com/o/oauth2/auth","token_uri":"https://accounts.google.com/o/oauth2/token","auth_provider_x509_cert_url":"https://www.googleapis.com/oauth2/v1/certs","client_secret":"xxxx","redirect_uris":["urn:ietf:wg:oauth:2.0:oob","http://localhost"]}} 

POST /oauth2/v3/token HTTP/1.1
Host: www.googleapis.com
Content-Type: application/x-www-form-urlencoded

        string tokenUri = @"https://accounts.google.com/o/oauth2/token";
        HttpWebRequest request=(HttpWebRequest) WebRequest.Create(tokenUri);


        NameValueCollection outgoingQueryString = HttpUtility.ParseQueryString(String.Empty);
        outgoingQueryString.Add("code", this.clientCode);
        outgoingQueryString.Add("client_id", this.clientID);
        outgoingQueryString.Add("client_secret", this.clientSecret);
        outgoingQueryString.Add("redirect_uri", "https://oauth2-login-demo.appspot.com/code");
        outgoingQueryString.Add("grant_type","authorization_code");
        string postdata = outgoingQueryString.ToString();


        byte[] byteArray = Encoding.UTF8.GetBytes(postdata);

        request.Method = "POST";
        request.ContentType = "application/x-www-form-urlencoded";
        request.ContentLength = byteArray.Length;

        Stream reqStr = request.GetRequestStream();
        reqStr.Write(byteArray, 0, byteArray.Length);
        reqStr.Flush();
        reqStr.Close();


        HttpWebResponse response=request.GetResponse() as HttpWebResponse;
        Console.WriteLine(response.StatusCode.ToString());

string tokenUri = "https://accounts.google.com/o/oauth2/token";
        TokenFileds f = new TokenFileds() { client_code = this.clientCode, client_id = this.clientID, client_secret = this.clientSecret, redirect_uri = "urn:ietf:wg:oauth:2.0:oob", grant_type = "authorization_code" };
        //string retString=this.SerializeToJson<TokenFileds>(f);
        string retString = this.NewjsonLib(f);
        byte[] byteArray=Encoding.UTF8.GetBytes(retString);

        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(tokenUri);
        request.Method = "POST";
        request.ContentType = "application/x-www-form-urlencoded;charset=utf-8";
        request.ContentLength = byteArray.Length;

        Stream strm = request.GetRequestStream();
        strm.Write(byteArray, 0, byteArray.Length);
        strm.Flush();
        strm.Close();
        HttpWebResponse response =request.GetResponse() as HttpWebResponse;