1

system/Tnb.Systems/System/DataInterfaceService.cs

@@ -39,6 +39,7 @@ using Mapster;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Mvc;
+using Newtonsoft.Json;
 using Newtonsoft.Json.Linq;
 using SqlSugar;
 
@@ -559,7 +560,17 @@ public class DataInterfaceService : IDataInterfaceService, IDynamicApiController
     {
         try
         {
-            return (await Preview(id, input)).ToObject<List<Dictionary<string, object>>>().FirstOrDefault().Keys.ToList();
+            //modifyby zhoukeda 20230803
+            var result = await Preview(id, input);
+            if (result is DataTable)
+            {
+                List<Dictionary<string,Object>> list = JsonConvert.DeserializeObject<List<Dictionary<string, object>>>(JsonConvert.SerializeObject(result));
+                return list.FirstOrDefault()?.Keys.ToList() ?? Enumerable.Empty<string>();
+            }
+            else
+            {
+                return result.ToObject<List<Dictionary<string, object>>>().FirstOrDefault().Keys.ToList();
+            }
         }
         catch (Exception e)
         {