From 3fdd97915612019d58ee31be1b45ce2aa03486ff Mon Sep 17 00:00:00 2001
From: sunkaixuna <610262374@qq.com>
Date: Thu, 23 Dec 2021 17:46:18 +0800
Subject: [PATCH] Optimization  tip

---
 .../Abstract/QueryableProvider/QueryableProvider.cs      | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/Src/Asp.Net/SqlSugar/Abstract/QueryableProvider/QueryableProvider.cs b/Src/Asp.Net/SqlSugar/Abstract/QueryableProvider/QueryableProvider.cs
index 14bf597e3..0b5f1eb85 100644
--- a/Src/Asp.Net/SqlSugar/Abstract/QueryableProvider/QueryableProvider.cs
+++ b/Src/Asp.Net/SqlSugar/Abstract/QueryableProvider/QueryableProvider.cs
@@ -1923,7 +1923,14 @@ namespace SqlSugar
         }
         protected ISugarQueryable<T> _As(string tableName, string entityName)
         {
-            this.QueryBuilder.AsTables.Add(entityName, tableName);
+            if (this.QueryBuilder.AsTables != null && this.QueryBuilder.AsTables.Any(it => it.Key == entityName))
+            {
+                Check.Exception(true, ErrorMessage.GetThrowMessage($"use As<{tableName}>(\"{tableName}\")", $"请把 As(\"{tableName}\"), 改成 As<{tableName}实体>(\"{tableName}\")"));
+            }
+            else
+            {
+                this.QueryBuilder.AsTables.Add(entityName, tableName);
+            }
             return this;
         }
         protected void _Filter(string FilterName, bool isDisabledGobalFilter)