diff --git a/samples/Sample.MySql/Sample.MySql.csproj b/samples/Sample.MySql/Sample.MySql.csproj
index fb86cb18..08b63cb5 100644
--- a/samples/Sample.MySql/Sample.MySql.csproj
+++ b/samples/Sample.MySql/Sample.MySql.csproj
@@ -7,15 +7,15 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="5.0.0">
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="6.0.8">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="Pomelo.EntityFrameworkCore.MySql" Version="5.0.0" />
+    <PackageReference Include="Pomelo.EntityFrameworkCore.MySql" Version="6.0.2" />
   </ItemGroup>
 
   <ItemGroup>
-    <ProjectReference Include="..\..\src5x\ShardingCore.5x\ShardingCore.5x.csproj" />
+    <ProjectReference Include="..\..\src\ShardingCore\ShardingCore.csproj" />
   </ItemGroup>
 
 
diff --git a/src/ShardingCore/Sharding/Visitors/DbContextReplaceQueryableVisitor.cs b/src/ShardingCore/Sharding/Visitors/DbContextReplaceQueryableVisitor.cs
index 2294cf2f..6095b64b 100644
--- a/src/ShardingCore/Sharding/Visitors/DbContextReplaceQueryableVisitor.cs
+++ b/src/ShardingCore/Sharding/Visitors/DbContextReplaceQueryableVisitor.cs
@@ -102,10 +102,10 @@ namespace ShardingCore.Core.Internal.Visitors
             if (RootIsVisit&&node.Method.ReturnType.IsMethodReturnTypeQueryableType()&&node.Method.ReturnType.IsGenericType)
             {
 #if EFCORE2 || EFCORE3
-                var notRoot = node.Arguments.All(o => !(o is ConstantExpression constantExpression&&constantExpression.Value is IQueryable));
+                var notRoot = node.Arguments.IsEmpty();
 #endif
 #if !EFCORE2 && !EFCORE3
-                var notRoot = node.Arguments.All(o => !(o is QueryRootExpression));
+                var notRoot = node.Arguments.IsEmpty();
 #endif
                 if (notRoot)
                 {
@@ -131,12 +131,6 @@ namespace ShardingCore.Core.Internal.Visitors
             return whereCallExpression;
         }
 
-        public Expression<Func<T, bool>> WhereTrueExpression<T>()
-        {
-            return t => true;
-        }
-
-
         internal sealed class TempVariable<T1>
         {
             public IQueryable<T1> Queryable { get; }
@@ -151,20 +145,6 @@ namespace ShardingCore.Core.Internal.Visitors
                 return Queryable;
             }
         }
-        internal sealed class TempMethodVariable<T1>
-        {
-            public IQueryable<T1> Queryable { get; }
-
-            public TempMethodVariable(Func<IQueryable<T1>> func)
-            {
-                Queryable = func();
-            }
-
-            public IQueryable<T1> GetQueryable()
-            {
-                return Queryable;
-            }
-        }
 
         internal sealed class TempDbVariable<T1>
         {