diff --git a/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/ExpressionContext.cs b/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/ExpressionContext.cs
index b9d72b446..b80c30198 100644
--- a/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/ExpressionContext.cs
+++ b/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/ExpressionContext.cs
@@ -158,6 +158,7 @@ namespace SqlSugar
         #endregion
 
         #region Override methods
+        public virtual string GetLimit() { return null; }
         public virtual string GetTranslationTableName(string entityName, bool isMapping = true)
         {
             Check.ArgumentNullException(entityName, string.Format(ErrorMessage.ObjNotExist, "Table Name"));
diff --git a/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Subquery/Items/SubTop.cs b/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Subquery/Items/SubTop.cs
index 5bd0d5961..8025ea004 100644
--- a/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Subquery/Items/SubTop.cs
+++ b/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Subquery/Items/SubTop.cs
@@ -61,9 +61,9 @@ namespace SqlSugar
             {
                 return (HasWhere?"AND":"WHERE")+ " ROWNUM=1";
             }
-            else if (this.Context is PostgreSQLExpressionContext)
+            else if (this.Context.GetLimit()!=null)
             {
-                return "limit 1";
+                return this.Context.GetLimit();
             }
             else
             {