·增加https验证

CallCenterCommon/CallCenter.Utility/ImageUpload.cs

@@ -4,6 +4,8 @@ using System.Web;
 using System.Web.UI.HtmlControls;
 using System.Drawing;
 using System.Net;
+using System.Security.Cryptography.X509Certificates;
+using System.Net.Security;
 
 namespace CallCenter.Utility
 {
@@ -690,15 +692,16 @@ namespace CallCenter.Utility
             }
         }
         #endregion
-
+       
         #region url下载文件并保存本地
         public string downloadurl(string url, string filename)
         {
             try
             {
+                
                 WebClient mywebclient = new WebClient();
+                System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
                 byte[] Bytes = mywebclient.DownloadData(url);
-
                 if (!Directory.Exists(_SavePath)) Directory.CreateDirectory(_SavePath);
 
                 using (var fs = new FileStream(_SavePath + filename, FileMode.Create))