获取船代列表信息接口优化

Myshipping.Core/Service/CommonDB/CommonDBService.cs

@@ -359,8 +359,16 @@ public class CommonDBService : ICommonDBService, IDynamicApiController, ITransie
         // 如果装货港代码不为空，则根据装货港代码查询装货港与船代的映射关系
         if (!string.IsNullOrEmpty(input.PortLoadCode))
         {
-            List<string> forwarderCodeList = await _relaPortLoadForwarderRep.AsQueryable().Where(x => x.PortLoadCode == input.PortLoadCode).Select(x => x.ForwarderCode).ToListAsync();
-            queryList = queryList.Where(x => forwarderCodeList.Contains(x.Code)).ToList();
+            List<string> forwarderCodeList = await _relaPortLoadForwarderRep.AsQueryable()
+                                                                            .Where(x => x.PortLoadCode == input.PortLoadCode)
+                                                                            .Select(x => x.ForwarderCode)
+                                                                            .ToListAsync();
+
+            // 如果确实存在映射关系，再进行过滤；否则
+            if (forwarderCodeList.Count > 0)
+            {
+                queryList = queryList.Where(x => forwarderCodeList.Contains(x.Code)).ToList();
+            }
         }
 
         if (queryList.Count() > 20)