"请求被中止: 未能创建 SSL/TLS 安全通道"解决办法

1.安装证书：

手动双击证书安装，过程略

2.分配权限：

在控制台中找到安装的证书，右键选择“管理私钥”，

添加自己需要的权限，如果在测试可以直接添加Everyone

3.修改代码：public static string Refund(string urlWithParams)

{
    ServicePointManager.Expect100Continue = true;
    ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;   //协议按需选择，不行就都试一遍
    ServicePointManager.ServerCertificateValidationCallback = (object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors) => { return true; };

    HttpWebRequest webRequest = (HttpWebRequest)HttpWebRequest.Create(urlWithParams);
    webRequest.Method = "GET";

    //查找我们导入的证书
    X509Store certStore = new X509Store(StoreName.My, StoreLocation.LocalMachine);
    certStore.Open(OpenFlags.ReadOnly);
    X509Certificate2Collection certCollection = certStore.Certificates.Find(X509FindType.FindBySubjectName, "安装的证书名字", false);
    webRequest.ClientCertificates.Add(certCollection[0]);

    using (WebResponse webResponse = webRequest.GetResponse())
    {
        var sr = new StreamReader(webResponse.GetResponseStream(), Encoding.UTF8);
        var responseData = sr.ReadToEnd();
        return responseData;
    }
}