!1023 UrlEncode 编码兼容 core 和framework

Merge pull request !1023 from 冰魄少年/next

Admin.NET/Admin.NET.Core/Extension/ObjectExtension.cs

@@ -58,7 +58,7 @@ public static partial class ObjectExtension
     /// <returns></returns>
     public static string UrlEncode(this string str)
     {
-        return string.IsNullOrEmpty(str) ? "" : System.Web.HttpUtility.UrlEncode(str, Encoding.UTF8);
+        return string.IsNullOrEmpty(str) ? "" : System.Uri.EscapeDataString(str);
     }
 
     /// <summary>