c# HttpClient,WebClient常用请求

get

 WebClient webClient = new WebClient();
            ServicePointManager.SecurityProtocol = (SecurityProtocolType)192 | (SecurityProtocolType)768 | (SecurityProtocolType)3072;
            //ServicePointManager.Expect100Continue = true; 
            //ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;
            webClient.Credentials = CredentialCache.DefaultCredentials;
            Byte[] pageData = webClient.DownloadData(url);
            webClient.Dispose();
            string jsondata = System.Text.Encoding.UTF8.GetString(pageData);
            return (Newtonsoft.Json.Linq.JObject)Newtonsoft.Json.JsonConvert.DeserializeObject(jsondata);

 post +User-Agent +Authorization

 public static string PostJson(string url,string json, string token)
        {
            using (var client = new HttpClient())
            {
                //client.DefaultRequestHeaders.Add("Authorization", "Bearer "+token+"");
                //var data = new StringContent(json, Encoding.UTF8, "application/json");
                //var response = client.PostAsync(url, data).GetAwaiter().GetResult();
                //string result = response.Content.ReadAsStringAsync().Result;
                //return result;
                client.DefaultRequestHeaders.Add("User-Agent", "Apifox/1.0.0 (https://apifox.com)");
                var request = new HttpRequestMessage(HttpMethod.Post, url)
                {
                    Content = new StringContent(json, Encoding.UTF8, "application/json")
                };
                request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", token);
                var response = client.SendAsync(request).GetAwaiter().GetResult();
                string result = response.Content.ReadAsStringAsync().Result;
                return result;
            }
        }

post + form-data

 static async Task Main(string[] args)
    {
        using (var client = new HttpClient())
        {
            var formData = new MultipartFormDataContent();
            formData.Add(new StringContent("John Doe"), "name");
            formData.Add(new StringContent("johndoe@example.com"), "email");
 
            var response = await client.PostAsync("http://example.com/submit-form", formData);
            string responseBody = await response.Content.ReadAsStringAsync();
 
            Console.WriteLine(responseBody);
        }
    }

我们使用formData.Add方法来添加表单数据，其中第一个参数是表单项的内容，第二个参数是表单项的名称

原文地址：https://blog.csdn.net/qtvb1987/article/details/143700625

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