基础连接已经关闭: 未能为 SSL/TLS 安全通道建立信任关系。 根据验证过程，远程证书无效------解决方法

Message = "基础连接已经关闭: 未能为 SSL/TLS 安全通道建立信任关系。" 

 InnerException = {"根据验证过程，远程证书无效。"}

解决方法如下：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Net;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using System.Windows.Forms;
using System.Xml;namespace EvaluationAndWitnessTestDemo
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }        private void Button1_Click(object sender, EventArgs e)
        {
            try
            {
                #region 第一种方式，远程文件，文件http下载                //string path = @"http://localhost:8080/Source/XMLConfig.xml";               
                //XmlDocument doc = new XmlDocument();
                //doc.Load(path);
                //XmlNode httpservice = doc.SelectSingleNode("configuration");
                //XmlNodeList httpserviceNodes = httpservice.ChildNodes; 
                #endregion                #region 第二种方式，本地文件
                //string path = AppDomain.CurrentDomain.BaseDirectory;
                //path = Path.Combine(path, "XMLConfig.xml");
                //XmlDocument doc = new XmlDocument();
                //doc.Load(path);
                //XmlNode httpservice = doc.SelectSingleNode("configuration");
                //XmlNodeList httpserviceNodes = httpservice.ChildNodes;
                #endregion                #region MyRegion
                string path = @"http://localhost:8080/Source/XMLConfig.xml";                XmlDocument doc = new XmlDocument();
                doc.Load(new System.Net.WebClient().DownloadString(path));
                XmlNode httpservice = doc.SelectSingleNode("configuration");
                XmlNodeList httpserviceNodes = httpservice.ChildNodes;
                #endregion如果是用https的话，由于没有证书，会报错：Message = "基础连接已经关闭: 未能为 SSL/TLS 安全通道建立信任关系。"   InnerException = {"根据验证过程，远程证书无效。"}
                //解决方法：button2_Click
            }
            catch (Exception ex)
            {
                System.Console.WriteLine(ex.Message);
            }
        }        private void Button2_Click(object sender, EventArgs e)
        {            SetCertificatePolicy();//https请求时会报错，如下图
            string path = @"https://localhost:448/Source/XMLConfig.xml";
            XmlDocument doc = new XmlDocument();
            doc.Load(path);
            XmlNode httpservice = doc.SelectSingleNode("configuration");
            XmlNodeList httpserviceNodes = httpservice.ChildNodes;
            foreach (XmlNode item in httpserviceNodes)
            {
                string Host = item.SelectSingleNode("host").InnerText.Trim();
                Console.WriteLine($"Host:{Host}");
            }            //下面的WebRequest也是一样的由于没有证书，报错Message = "基础连接已经关闭: 未能为 SSL/TLS 安全通道建立信任关系。"   InnerException = {"根据验证过程，远程证书无效。"}
            //WebResponse response = WebRequest.Create(@"https://localhost:448/Source/XMLConfig.xml").GetResponse();
            //Stream streamReceive = response.GetResponseStream();
            //Encoding encoding = Encoding.UTF8;            //StreamReader streamReader = new StreamReader(streamReceive, encoding);
            //string strResult = streamReader.ReadToEnd();
            //streamReceive.Dispose();
            //streamReader.Dispose();
            //Console.WriteLine(strResult);
        }        /// <summary>
        /// Sets the cert policy.
        /// </summary>
        public static void SetCertificatePolicy()
        {
            ServicePointManager.ServerCertificateValidationCallback += RemoteCertificateValidate;
        }        /// <summary>
        /// Remotes the certificate validate.
        /// </summary>
        private static bool RemoteCertificateValidate(object sender, X509Certificate cert, X509Chain chain, SslPolicyErrors error)
        {
            // trust any certificate!!!
            System.Console.WriteLine("Warning, trust any certificate");
            return true;
        }
    }
}

如图：

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