图片分离优化

Tools/MyUtils/SegPicture.cs

@@ -313,6 +313,8 @@ namespace Tools.MyUtils
         {
             var url = $"{this.BaseUrl}/PrepareUpload.aspx";
             using (var web = new WebClient())
+            {
+                try
                 {
                     web.Proxy = null;
                     web.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
@@ -322,6 +324,10 @@ namespace Tools.MyUtils
                     var content = Encoding.UTF8.GetString(bytes);
                     return content == "1";
                 }
+                catch (Exception) { /*未请求到主机*/ }
+
+                return false;
+            }
         }
         /// <summary>
         /// 下载成字节数组