C# 调用接口实例httpclient（postman）

调用主体

Get请求

var httpClient = new HttpClient();            
            var getTokenUrl = new Uri("接口网络地址");
            var response = httpClient.GetAsync(getTokenUrl).Result;
            var data = response.Content.ReadAsStringAsync().Result;//接口调用成功获取的数据
            JObject jsonInfo = (JObject)JsonConvert.DeserializeObject(data);
            string code = Convert.ToString(jsonInfo["errcode"]);

Post请求 

此处例举的是传headers，如果不需要注释掉

#region 调用接口（postman）

            
            string Url = "http://?.?.?.?:9900/weather";//请求的url地址
            //string ContentTypeS = "application/x-www-form-urlencoded"; //格式类型（x-www-form-urlencoded格式传参）
            string ContentTypeS = "application/json"; //格式类型（json格式传参）

            //string PostData = "mode=" + "insert" + "&data=" + json;    //传送的数据（x-www-form-urlencoded传参）
            sendCS sendcs = new sendCS();
            sendcs.mode = "insert";
            sendcs.data = "12345";
            string jkid = "12345";
            //转json
            string PostData = JsonConvert.SerializeObject(sendcs);    //传送的数据（json传参）
            RestApiClient DXApiManager = new RestApiClient(Url, HttpVerbNew.POST, ContentTypeS, PostData, jkid);
            string returnInfo = DXApiManager.MakeRequest();
            //转为json对象(添加Newtonsoft.Json.dll引用)
            JObject jsonInfo = (JObject)JsonConvert.DeserializeObject(returnInfo);
            string code = Convert.ToString(jsonInfo["code"]);//输出  结果
            string msg = Convert.ToString(jsonInfo["msg"]);//输出  结果

            //再根据code返回值去判断成功或失败，返回结果

            #endregion

相关类

public class RestApiClient
        {
            public string EndPoint { get; set; }    //请求的url地址  
            public HttpVerbNew Method { get; set; }    //请求的方法
            public string ContentType { get; set; } //格式类型
            public string PostData { get; set; }    //传送的数据
            public string JKID { get; set; }    //headers 参数


            public RestApiClient()
            {
                EndPoint = "";
                Method = HttpVerbNew.GET;
                ContentType = "text/xml";
                PostData = "";
            }
            public RestApiClient(string endpoint, string contentType)
            {
                EndPoint = endpoint;
                Method = HttpVerbNew.GET;
                ContentType = contentType;
                PostData = "";
            }
            public RestApiClient(string endpoint, HttpVerbNew method, string contentType)
            {
                EndPoint = endpoint;
                Method = method;
                ContentType = contentType;
                PostData = "";
            }


            public RestApiClient(string endpoint, HttpVerbNew method, string contentType, string postData,string jkid)
            {
                EndPoint = endpoint;
                Method = method;
                ContentType = contentType;
                PostData = postData;
                JKID = jkid;
            }


            // 添加https
            private static readonly string DefaultUserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";


            private static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
            {
                if (errors == SslPolicyErrors.None)
                    return true;
                return false;
            }
            // end添加https


            public string MakeRequest()
            {
                return MakeRequest("");
            }


            public string MakeRequest(string parameters)
            {
                // 添加https
                if (EndPoint.Substring(0, 8) == "https://")
                {
                    ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);
                    ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;
                }
                var request = (HttpWebRequest)HttpWebRequest.Create(EndPoint + parameters);
                if (EndPoint.Substring(0, 8) == "https://")
                {
                    //string clientp12path = AppDomain.CurrentDomain.BaseDirectory + "\Certificate\outgoing.CertwithKey.pkcs12";
                    //string clientp12PassWord = "IoM@1234";
                    //string clientp12path2 = AppDomain.CurrentDomain.BaseDirectory + "\Certificate\server.pem";
                    //string clientp12PassWord2 = "1qaz2wsx";
                    //X509Store certStore = new X509Store(StoreName.My, StoreLocation.LocalMachine);
                    //certStore.Open(OpenFlags.ReadOnly);
                    //X509Certificate2 cer = new X509Certificate2(clientp12path, clientp12PassWord);
                    //X509Certificate2 cer2 = new X509Certificate2(clientp12path2, clientp12PassWord2);
                    //request.ClientCertificates.Add(cer);
                    //request.ClientCertificates.Add(cer2);
                    ServicePointManager.ServerCertificateValidationCallback += (object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors) =>
                    {
                        return true;
                    };
                    request.UserAgent = DefaultUserAgent;
                }
                // end添加https
                request.Method = Method.ToString();
                request.ContentLength = 0;
                request.ContentType = ContentType;
                request.ProtocolVersion = HttpVersion.Version10;
                request.Headers.Add("alpha_auth_token", "asdf12345");
                request.Headers.Add("alpha_auth_jkid", JKID);


                if (!string.IsNullOrEmpty(PostData) && Method == HttpVerbNew.POST)//如果传送的数据不为空，并且方法是post
                {
                    var encoding = new UTF8Encoding();
                    var bytes = Encoding.UTF8.GetBytes(PostData);//编码方式按自己需求进行更改，我在项目中使用的是UTF-8
                    request.ContentLength = bytes.Length;
                    using (var writeStream = request.GetRequestStream())
                    {
                        writeStream.Write(bytes, 0, bytes.Length);
                    }
                }
                else if (!string.IsNullOrEmpty(PostData) && Method == HttpVerbNew.PUT)//如果传送的数据不为空，并且方法是put
                {
                    var encoding = new UTF8Encoding();
                    var bytes = Encoding.UTF8.GetBytes(PostData);//编码方式按自己需求进行更改，我在项目中使用的是UTF-8
                    request.ContentLength = bytes.Length;
                    using (var writeStream = request.GetRequestStream())
                    {
                        writeStream.Write(bytes, 0, bytes.Length);
                    }
                }
                using (var response = (HttpWebResponse)request.GetResponse())
                {
                    var responseValue = string.Empty;
                    if (response.StatusCode != HttpStatusCode.OK && response.StatusCode != HttpStatusCode.NoContent && response.StatusCode != HttpStatusCode.Created)
                    {
                        var message = response.StatusCode.ToString();
                        throw new ApplicationException(message);
                    }
                    // grab the response
                    using (var responseStream = response.GetResponseStream())
                    {
                        if (responseStream != null)
                            using (var reader = new StreamReader(responseStream))
                            {
                                responseValue = reader.ReadToEnd();
                            }
                    }
                    return responseValue;
                }
            }


        }
        public enum HttpVerbNew
        {
            GET,            //method  常用的就这几样，可以添加其他的   get：获取    post：修改    put：写入    delete：删除
            POST,
            PUT,
            DELETE
        }

httpclient万能写法

现在postman越来越便利，当我们用postman调通接口后，可直接一键成生code（postman版本不同位置不同）

举例：

 

点击后可一键生成代码   扔进项目里就可运行 前提！！！需要添加一个NuGet包 --- RestSharp