diff --git a/Src/Asp.Net/SqlSugar/SqlSugar.nuspec b/Src/Asp.Net/SqlSugar/SqlSugar.nuspec
index 955323513..a77663a00 100644
--- a/Src/Asp.Net/SqlSugar/SqlSugar.nuspec
+++ b/Src/Asp.Net/SqlSugar/SqlSugar.nuspec
@@ -2,7 +2,7 @@
 <package >
   <metadata>
     <id>sqlSugar</id>
-    <version>4.2.1.6</version>
+    <version>4.2.1.7</version>
     <title>SqlSugar SqlServer ORM</title>
     <authors>sun kaixuan</authors>
     <owners>landa</owners>
diff --git a/Src/Asp.NetCore/SqlServerTest/src/SqlSugar/Abstract/DbBindProvider/DbBindAccessory.cs b/Src/Asp.NetCore/SqlServerTest/src/SqlSugar/Abstract/DbBindProvider/DbBindAccessory.cs
index 22300c3c8..6cb1a8bd4 100644
--- a/Src/Asp.NetCore/SqlServerTest/src/SqlSugar/Abstract/DbBindProvider/DbBindAccessory.cs
+++ b/Src/Asp.NetCore/SqlServerTest/src/SqlSugar/Abstract/DbBindProvider/DbBindAccessory.cs
@@ -135,7 +135,7 @@ namespace SqlSugar
                     }
                     else
                     {
-                        reval.Add((T)Convert.ChangeType(re.GetValue(0), type));
+                        reval.Add((T)Convert.ChangeType(re.GetValue(0),PubMethod.GetUnderType(type)));
                     }
                 }
             }
diff --git a/Src/Asp.NetCore/SqlServerTest/src/SqlSugar/Abstract/DbMaintenanceProvider/Methods.cs b/Src/Asp.NetCore/SqlServerTest/src/SqlSugar/Abstract/DbMaintenanceProvider/Methods.cs
index a3b83628a..885655b53 100644
--- a/Src/Asp.NetCore/SqlServerTest/src/SqlSugar/Abstract/DbMaintenanceProvider/Methods.cs
+++ b/Src/Asp.NetCore/SqlServerTest/src/SqlSugar/Abstract/DbMaintenanceProvider/Methods.cs
@@ -111,6 +111,7 @@ namespace SqlSugar
         }
         public virtual bool IsAnySystemTablePermissions()
         {
+            this.Context.Ado.CheckConnection();
             string sql = this.CheckSystemTablePermissionsSql;
             this.Context.Ado.CheckConnection();
             try
diff --git a/Src/Asp.NetCore/SqlServerTest/src/SqlSugar/Abstract/QueryableProvider/QueryableAccessory.cs b/Src/Asp.NetCore/SqlServerTest/src/SqlSugar/Abstract/QueryableProvider/QueryableAccessory.cs
index 5782cd62f..f9fba01b0 100644
--- a/Src/Asp.NetCore/SqlServerTest/src/SqlSugar/Abstract/QueryableProvider/QueryableAccessory.cs
+++ b/Src/Asp.NetCore/SqlServerTest/src/SqlSugar/Abstract/QueryableProvider/QueryableAccessory.cs
@@ -10,5 +10,6 @@ namespace SqlSugar
     public class QueryableAccessory
     {
         protected ILambdaExpressions _LambdaExpressions;
+        protected bool _RestoreMapping = true;
     }
 }
diff --git a/Src/Asp.NetCore/SqlServerTest/src/SqlSugar/Abstract/QueryableProvider/QueryableProvider.cs b/Src/Asp.NetCore/SqlServerTest/src/SqlSugar/Abstract/QueryableProvider/QueryableProvider.cs
index 41516fb47..22e209b0c 100644
--- a/Src/Asp.NetCore/SqlServerTest/src/SqlSugar/Abstract/QueryableProvider/QueryableProvider.cs
+++ b/Src/Asp.NetCore/SqlServerTest/src/SqlSugar/Abstract/QueryableProvider/QueryableProvider.cs
@@ -490,8 +490,11 @@ namespace SqlSugar
         }
         public virtual DataTable ToDataTablePage(int pageIndex, int pageSize, ref int totalNumber)
         {
+            _RestoreMapping = false;
             totalNumber = this.Count();
-            return ToDataTablePage(pageIndex, pageSize);
+            var result = ToDataTablePage(pageIndex, pageSize);
+            _RestoreMapping = true;
+            return result;
         }
 
         public virtual List<T> ToList()
@@ -516,11 +519,15 @@ namespace SqlSugar
         }
         public virtual List<T> ToPageList(int pageIndex, int pageSize, ref int totalNumber)
         {
+            _RestoreMapping = false;
+            List<T> result = null;
             totalNumber = this.Count();
             if (totalNumber == 0)
-                return new List<T>();
+                result = new List<T>();
             else
-                return ToPageList(pageIndex, pageSize);
+                result = ToPageList(pageIndex, pageSize);
+            _RestoreMapping = true;
+            return result;
         }
 
         public virtual KeyValuePair<string, List<SugarParameter>> ToSql()
@@ -671,7 +678,7 @@ namespace SqlSugar
         }
         protected void RestoreMapping()
         {
-            if (IsAs)
+            if (IsAs && _RestoreMapping)
             {
                 this.Context.MappingTables = OldMappingTableList == null ? new MappingTableList() : OldMappingTableList;
             }
diff --git a/Src/Asp.NetCore/SqlServerTest/src/SqlSugar/Properties/AssemblyInfo.cs b/Src/Asp.NetCore/SqlServerTest/src/SqlSugar/Properties/AssemblyInfo.cs
index 31d54824d..9d6b04136 100644
--- a/Src/Asp.NetCore/SqlServerTest/src/SqlSugar/Properties/AssemblyInfo.cs
+++ b/Src/Asp.NetCore/SqlServerTest/src/SqlSugar/Properties/AssemblyInfo.cs
@@ -17,5 +17,5 @@ using System.Runtime.InteropServices;
 
 // The following GUID is for the ID of the typelib if this project is exposed to COM
 [assembly: Guid("1c022a5c-4e4d-4026-a8a3-f659b9740a1a")]
-[assembly: AssemblyVersion("4.2.1.5")]
-[assembly: AssemblyFileVersion("4.2.1.5")]
+[assembly: AssemblyVersion("4.2.1.7")]
+[assembly: AssemblyFileVersion("4.2.1.7")]
diff --git a/Src/Asp.NetCore/SqlServerTest/src/SqlSugar/SqlSugarForCore.nuspec b/Src/Asp.NetCore/SqlServerTest/src/SqlSugar/SqlSugarForCore.nuspec
index 2192c5970..cea63223e 100644
--- a/Src/Asp.NetCore/SqlServerTest/src/SqlSugar/SqlSugarForCore.nuspec
+++ b/Src/Asp.NetCore/SqlServerTest/src/SqlSugar/SqlSugarForCore.nuspec
@@ -2,7 +2,7 @@
 <package >
   <metadata>
     <id>sqlSugarCore</id>
-    <version>4.2.1.5</version>
+    <version>4.2.1.7</version>
     <authors>sunkaixuan</authors>
     <owners>Landa</owners>
     <licenseUrl>http://www.apache.org/licenses/LICENSE-2.0.html</licenseUrl>
diff --git a/Src/Asp.NetCore/SqlServerTest/src/SqliteTest/DataBase/SqlSugar4xTest.sqlite b/Src/Asp.NetCore/SqlServerTest/src/SqliteTest/DataBase/SqlSugar4xTest.sqlite
index ee99c4227..96af80ba8 100644
Binary files a/Src/Asp.NetCore/SqlServerTest/src/SqliteTest/DataBase/SqlSugar4xTest.sqlite and b/Src/Asp.NetCore/SqlServerTest/src/SqliteTest/DataBase/SqlSugar4xTest.sqlite differ