diff --git a/src/ShardingCore/Extensions/ShardingExtension.cs b/src/ShardingCore/Extensions/ShardingExtension.cs
index e73e68c6..f20dbb43 100644
--- a/src/ShardingCore/Extensions/ShardingExtension.cs
+++ b/src/ShardingCore/Extensions/ShardingExtension.cs
@@ -1,6 +1,8 @@
 using System;
 using System.Collections.Generic;
+using System.Linq.Expressions;
 using System.Text;
+using Microsoft.EntityFrameworkCore.Infrastructure;
 using ShardingCore.Exceptions;
 using ShardingCore.Sharding.Abstractions;
 
@@ -44,7 +46,17 @@ namespace ShardingCore.Extensions
         public static string FormatRouteTail2ModelCacheKey(this string originalTail)
         {
             return $"{ShardingTableDbContextFormat}{originalTail}";
-            ;
+        }
+
+        public static string ShardingPrint(this Expression expression)
+        {
+
+#if !EFCORE2
+           return expression.Print();
+#endif
+#if EFCORE2
+                return expression.ToString();
+#endif
         }
     }
 }
diff --git a/src/ShardingCore/Sharding/StreamMergeEngines/Abstractions/AbstractInMemoryAsyncMergeEngine.cs b/src/ShardingCore/Sharding/StreamMergeEngines/Abstractions/AbstractInMemoryAsyncMergeEngine.cs
index 60208e88..6bd5017a 100644
--- a/src/ShardingCore/Sharding/StreamMergeEngines/Abstractions/AbstractInMemoryAsyncMergeEngine.cs
+++ b/src/ShardingCore/Sharding/StreamMergeEngines/Abstractions/AbstractInMemoryAsyncMergeEngine.cs
@@ -31,12 +31,7 @@ namespace ShardingCore.Sharding.StreamMergeEngines.Abstractions
         {
             _methodCallExpression = methodCallExpression;
             var expression = methodCallExpression.Arguments.FirstOrDefault(o => typeof(IQueryable).IsAssignableFrom(o.Type))
-#if !EFCORE2
-                             ?? throw new InvalidOperationException(methodCallExpression.Print());
-#endif
-#if EFCORE2
-                             ?? throw new InvalidOperationException(methodCallExpression.ToString());
-#endif
+                             ?? throw new InvalidOperationException(methodCallExpression.ShardingPrint());
             _queryable = new EnumerableQuery<TEntity>(expression);
             _secondExpression = methodCallExpression.Arguments.FirstOrDefault(o => !typeof(IQueryable).IsAssignableFrom(o.Type));
 
@@ -48,12 +43,7 @@ namespace ShardingCore.Sharding.StreamMergeEngines.Abstractions
             {
                 if (methodCallExpression.Arguments.Count == 2)
                 {
-#if !EFCORE2
-                    throw new InvalidOperationException(methodCallExpression.Print());
-#endif
-#if EFCORE2
-                    throw new InvalidOperationException(methodCallExpression.ToString());
-#endif
+                    throw new InvalidOperationException(methodCallExpression.ShardingPrint());
                 }
             }
 
diff --git a/src/ShardingCore/Sharding/StreamMergeEngines/AsyncEnumerableStreamMergeEngine.cs b/src/ShardingCore/Sharding/StreamMergeEngines/AsyncEnumerableStreamMergeEngine.cs
index 311a45fe..79d04cf8 100644
--- a/src/ShardingCore/Sharding/StreamMergeEngines/AsyncEnumerableStreamMergeEngine.cs
+++ b/src/ShardingCore/Sharding/StreamMergeEngines/AsyncEnumerableStreamMergeEngine.cs
@@ -44,17 +44,6 @@ namespace ShardingCore.Sharding.StreamMergeEngines
             await enumator.MoveNextAsync();
             return enumator;
         }
-#endif
-#if EFCORE2
-        private async Task<IAsyncEnumerator<T>> GetAsyncEnumerator(IQueryable<T> newQueryable)
-        {
-            var enumator = newQueryable.AsAsyncEnumerable().GetEnumerator();
-            await enumator.MoveNext();
-            return enumator;
-        }
-#endif
-#if !EFCORE2
-
         public IAsyncEnumerator<T> GetAsyncEnumerator(CancellationToken cancellationToken = new CancellationToken())
         {
             return GetShardingEnumerator();
@@ -62,6 +51,12 @@ namespace ShardingCore.Sharding.StreamMergeEngines
 #endif
 
 #if EFCORE2
+        private async Task<IAsyncEnumerator<T>> GetAsyncEnumerator(IQueryable<T> newQueryable)
+        {
+            var enumator = newQueryable.AsAsyncEnumerable().GetEnumerator();
+            await enumator.MoveNext();
+            return enumator;
+        }
         IAsyncEnumerator<T> IAsyncEnumerable<T>.GetEnumerator()
         {
             return GetShardingEnumerator();