C# HttpClient 请求

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最新推荐文章于 2025-06-07 12:30:31 发布

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分类专栏：斜月冷照寒冰凉席文章标签： HttpClient C# WebApi

本文链接：https://blog.youkuaiyun.com/sun_zeliang/article/details/81587835

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本文介绍了一种使用C#实现的HTTP请求处理方法，包括GET、POST、PUT等请求方式，并通过Newtonsoft.Json库进行JSON数据的序列化与反序列化。文中详细展示了如何设置请求头、发送请求及处理响应。

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引用 Newtonsoft.Json

        // Post请求
        public string PostResponse(string url,string postData,out string statusCode)
        {
            string result = string.Empty;
            //设置Http的正文
            HttpContent httpContent = new StringContent(postData);
            //设置Http的内容标头
            httpContent.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/json");
            //设置Http的内容标头的字符
            httpContent.Headers.ContentType.CharSet = "utf-8";
            using(HttpClient httpClient=new HttpClient())
            {
                //异步Post
                HttpResponseMessage response = httpClient.PostAsync(url, httpContent).Result;
                //输出Http响应状态码
                statusCode = response.StatusCode.ToString();
                //确保Http响应成功
                if (response.IsSuccessStatusCode)
                {
                    //异步读取json
                    result = response.Content.ReadAsStringAsync().Result;
                }
            }
            return result;
        }

        // 泛型：Post请求
        public T PostResponse<T>(string url,string postData) where T:class,new()
        {
            T result = default(T);

            HttpContent httpContent = new StringContent(postData);
            httpContent.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/json");
            httpContent.Headers.ContentType.CharSet = "utf-8";
            using(HttpClient httpClient=new HttpClient())
            {
                HttpResponseMessage response = httpClient.PostAsync(url, httpContent).Result;

                if (response.IsSuccessStatusCode)
                {
                    Task<string> t = response.Content.ReadAsStringAsync();
                    string s = t.Result;
                    //Newtonsoft.Json
                    string json = JsonConvert.DeserializeObject(s).ToString();
                    result = JsonConvert.DeserializeObject<T>(json); 
                }
            }
            return result;
        }

        // 泛型：Get请求
        public T GetResponse<T>(string url) where T :class,new()
        {
            T result = default(T);

            using (HttpClient httpClient=new HttpClient())
            {
                httpClient.DefaultRequestHeaders.Accept.Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("application/json"));
                HttpResponseMessage response = httpClient.GetAsync(url).Result;

                if (response.IsSuccessStatusCode)
                {
                    Task<string> t = response.Content.ReadAsStringAsync();
                    string s = t.Result;
                    string json = JsonConvert.DeserializeObject(s).ToString();
                    result = JsonConvert.DeserializeObject<T>(json);
                }
            }
            return result;
        }

        // Get请求
        public string GetResponse(string url, out string statusCode)
        {
            string result = string.Empty;

            using (HttpClient httpClient = new HttpClient())
            {
                httpClient.DefaultRequestHeaders.Accept.Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("application/json"));

                HttpResponseMessage response = httpClient.GetAsync(url).Result;
                statusCode = response.StatusCode.ToString();

                if (response.IsSuccessStatusCode)
                {
                    result = response.Content.ReadAsStringAsync().Result;
                }
            }
            return result;
        }

        // Put请求
        public string PutResponse(string url, string putData, out string statusCode)
        {
            string result = string.Empty;
            HttpContent httpContent = new StringContent(putData);
            httpContent.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/json");
            httpContent.Headers.ContentType.CharSet = "utf-8";
            using (HttpClient httpClient = new HttpClient())
            {
                HttpResponseMessage response = httpClient.PutAsync(url, httpContent).Result;
                statusCode = response.StatusCode.ToString();
                if (response.IsSuccessStatusCode)
                {
                    result = response.Content.ReadAsStringAsync().Result;
                }
            }
            return result;
        }

        // 泛型：Put请求
        public T PutResponse<T>(string url, string putData) where T : class, new()
        {
            T result = default(T);
            HttpContent httpContent = new StringContent(putData);
            httpContent.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/json");
            httpContent.Headers.ContentType.CharSet = "utf-8";
            using(HttpClient httpClient=new HttpClient())
            {
                HttpResponseMessage response = httpClient.PutAsync(url, httpContent).Result;

                if (response.IsSuccessStatusCode)
                {
                    Task<string> t = response.Content.ReadAsStringAsync();
                    string s = t.Result;
                    string json = JsonConvert.DeserializeObject(s).ToString();
                    result = JsonConvert.DeserializeObject<T>(json);
                }
            }
            return result;
        }