C#如何進行https的GET與POST請求以及照片上傳

針對HTTPS的請求我們需要額外處理一下證書，廢話不多少直接代碼貼給大家！

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.IO;
using System.Web;
using System.Security.Cryptography.X509Certificates;
using System.Net.Security;

namespace WSDMagazine
{
    /// <summary>
    /// 該類主要是處理網絡請求
    /// </summary>
    public class ApplicationUtil
    {

        /// <summary>
        /// 該方法主要是處理POST請求,返回處理返回的結果字符串
        /// </summary>
        /// <param name="posturl">請求的接口鏈接</param>
        /// <param name="postdata">請求的數據</param>
        /// <returns>返回的結果</returns>
        /// 
        #region 該方法主要是處理POST請求,返回處理的結果字符串
        public string DealPost(string posturl, string postdata)
        {
            string responseString = "";//post返回的結果
            ServicePointManager.ServerCertificateValidationCallback
                        += RemoteCertificateValidate;
            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;
            HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(posturl);
            req.Method = "POST";
            req.Headers["Cookie"] = "usersession=67d2da2c9f17e5e189fb1bf334fc6e36";
            byte[] postBytes = Encoding.UTF8.GetBytes(postdata);
            req.ContentType = "application/json; charset=utf-8";
            req.ContentLength = Encoding.UTF8.GetByteCount(postdata);//strJson爲json字符串
            Stream stream = req.GetRequestStream();
            stream.Write(postBytes, 0, postBytes.Length);
            req.Timeout = 90000;
            stream.Close();
            var response = req.GetResponse();
            Stream streamResponse = response.GetResponseStream();
            StreamReader streamRead = new StreamReader(streamResponse);
            responseString = streamRead.ReadToEnd();
            response.Close();
            streamRead.Close();
            return responseString;
        }
        #endregion

        #region 信任https請求證書
        private static bool RemoteCertificateValidate(
            object sender, X509Certificate cert,
             X509Chain chain, SslPolicyErrors error)
        {
            System.Console.WriteLine("Warning, trust any certificate");
            return true;
        }
        #endregion

        #region 該方法主要是處理Get請求,返回處理的結果字符串
        public string DealGet(string url)
        {
            //設置安全的類型
            ServicePointManager.ServerCertificateValidationCallback
                       += RemoteCertificateValidate;
            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;
            HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(url);
            myRequest.Method = "GET";
            HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();
            StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8);
            string content = reader.ReadToEnd();
            reader.Close();
            return content;
        }
        #endregion

        #region 自定義一個方法實現Http上傳
        public string UploadByHttp(string posturl, string path)
        {
            ServicePointManager.ServerCertificateValidationCallback
                    += RemoteCertificateValidate;
            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;
            HttpWebRequest request = WebRequest.Create(posturl) as HttpWebRequest;
            CookieContainer cookieContainer = new CookieContainer();
            request.CookieContainer = cookieContainer;
            request.AllowAutoRedirect = true;
            request.Method = "POST";
            string boundary = DateTime.Now.Ticks.ToString("X"); // 隨機分隔線
            request.ContentType = "multipart/form-data;charset=utf-8;boundary=" + boundary;
            byte[] itemBoundaryBytes = Encoding.UTF8.GetBytes("\r\n--" + boundary + "\r\n");
            byte[] endBoundaryBytes = Encoding.UTF8.GetBytes("\r\n--" + boundary + "--\r\n");
            int pos = path.LastIndexOf("\\");
            string fileName = path.Substring(pos + 1);
            //請求頭部信息 
            StringBuilder sbHeader = new StringBuilder(string.Format("Content-Disposition:form-data;name=\"file\";filename=\"{0}\"\r\nContent-Type:application/octet-stream\r\n\r\n", fileName));
            byte[] postHeaderBytes = Encoding.UTF8.GetBytes(sbHeader.ToString());
            FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read);
            byte[] bArr = new byte[fs.Length];
            fs.Read(bArr, 0, bArr.Length);
            fs.Close();
            Stream postStream = request.GetRequestStream();
            //寫入照片信息
            postStream.Write(itemBoundaryBytes, 0, itemBoundaryBytes.Length);
            postStream.Write(postHeaderBytes, 0, postHeaderBytes.Length);
            postStream.Write(bArr, 0, bArr.Length);
            postStream.Write(endBoundaryBytes, 0, endBoundaryBytes.Length);
            postStream.Close();
            //發送請求並獲取相應迴應數據
            HttpWebResponse response = request.GetResponse() as HttpWebResponse;
            //直到request.GetResponse()程序纔開始向目標網頁發送Post請求
            Stream instream = response.GetResponseStream();
            StreamReader sr = new StreamReader(instream, Encoding.UTF8);
            //返回結果網頁（html）代碼
            string content = sr.ReadToEnd();
            return content;
        }
        #endregion
    }
}