C# – 必须使用适当的属性或方法修改“Content-Type”标头.参数名称：名称

使用HttpWebRequest GET方法来调用REST服务.我收到错误： – ***’Content-Type’标头必须使用适当的属性或方法进行修改.参数名称：name.***我从stackoverflow检查了所有与此问题相关的答案.)

public string PostUrl(string url, string json)
{
            string appkey = "fa3a4c9efe16449fb1d4b"; //appkey
            string appsecret = "9D261499DF754A53A374BAB662C3CF49"; //appsecret

            string sign = ""; //验签
            var timestamp = (DateTime.Now.ToUniversalTime().Ticks - 621355968000000000) / 10000;
            string nonce = Guid.NewGuid().ToString(); 
            string result = "x-aep-appkey=" + appkey + "&x-aep-nonce=" + nonce + "&x-aep-timestamp=" + timestamp;

            //sign = ZZAYwebservice.Models.sm3.Sm3Crypto.ToSM3HexStr(result, appsecret);
            sign = Sm3Crypto.ToSM3string(result, appsecret);

            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
            req.ContentType = "application/json";
            //req.Headers.Add("Content-Type", "application/json");
            req.Headers.Add("x-aep-timestamp", timestamp.ToString());
            req.Headers.Add("x-aep-appkey", appkey);
            req.Headers.Add("x-aep-nonce", nonce);
            req.Headers.Add("x-aep-signature", sign);
            req.Method = "POST";
            req.Timeout = 30000;//设置请求超时时间，单位为毫秒
            req.ContentType = "application/json";

            byte[] data = Encoding.UTF8.GetBytes(json);
            req.ContentLength = data.Length;
            using (Stream reqStream = req.GetRequestStream())
            {
                reqStream.Write(data, 0, data.Length);

                reqStream.Close();
            }
            HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
            Stream stream = resp.GetResponseStream();
            //获取响应内容
            using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
            {
                result = reader.ReadToEnd();
            }
            return result;
}

解决方法:

我也结束了这个问题.但意识到问题在于如何设置内容类型.

正确的设置方法是

request.ContentType = "application/json";