谢谢回复，我试试看
用HttpWebRequest配置请求方便一点?

你说的是不是这样：
request.Headers.Add("Authorization", "connectapitoken:DC5F8105-7717-4EA1-A4BF-0ED4-E85C2D77");
还是返回错误

@jianming2032: 返回的结果是啥？？

@jianming2032: 不是那样的。后面没有冒号。将冒号换成空格。

加了
string paraUrlCoded = paras;
byte[] payload;
//将URL编码后的字符串转化为字节
payload = System.Text.Encoding.UTF8.GetBytes(paraUrlCoded);//Encoding.ASCII.GetBytes(paraUrlCoded); ;//
//设置请求的 ContentLength
request.ContentLength = payload.Length;

@jianming2032: 还是没有用的吗？

@华临天下: 嗯。

@jianming2032: 

   var buffer = Encoding.UTF8.GetBytes(param);
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);

            request.Method = "Post";
            request.ContentType = "application/x-www-form-urlencoded";
            request.ContentLength = buffer.Length;
            request.Timeout = 60 * 1000;           

            Stream reqStream = request.GetRequestStream();
            reqStream.Write(buffer, 0, buffer.Length);
         

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            Stream stream = response.GetResponseStream();
            StreamReader reader = new StreamReader(stream);
            var res = reader.ReadToEnd();

这个是我刚刚简写的一个请求，可以请求我本地的一个方法。你可以看看有没有对你帮助

@华临天下: 我对比了一下，基本上是一样的
System.Net.HttpWebRequest request;
request = (System.Net.HttpWebRequest)HttpWebRequest.Create(url);
//Post请求方式
request.Method = "POST";
// 内容类型
//request.ContentLength = 460;
request.ContentType = "application/json";
request.Accept = "application/json";
request.Headers.Add("connectapitoken", "DC5F8105-7717-4EA1-A4BF-0ED4-E85C2D77");
request.UserAgent = IE8;
//这是原始代码：
string paraUrlCoded = paras;// "p1=x&p2=y&p3=测试的中文";
byte[] payload;
//将URL编码后的字符串转化为字节
payload = System.Text.Encoding.UTF8.GetBytes(paraUrlCoded);//Encoding.ASCII.GetBytes(paraUrlCoded); ;//
//设置请求的 ContentLength
request.ContentLength = payload.Length;
//获得请 求流
Stream writer = request.GetRequestStream();
//将请求参数写入流
writer.Write(payload, 0, payload.Length);
// 关闭请求流
writer.Close();
System.Net.HttpWebResponse response;
// 获得响应流
response = (System.Net.HttpWebResponse)request.GetResponse();
System.IO.Stream resst;
resst = response.GetResponseStream();

            //解压缩
            if (response.ContentEncoding.ToLower().Contains("gzip"))
            {
                resst = new GZipStream(resst, CompressionMode.Decompress);
            }
            StreamReader sr = new StreamReader(resst, Encoding.UTF8);
            string str = sr.ReadToEnd();

            return str;

@jianming2032: 那你调试的时候是那边出错了啊？

@华临天下: 嗯，已经可以了，谢谢，不是这个的问题，是提交的数据不对，多谢了