diff --git a/Dapper.Contrib/SqlMapperExtensions.Async.cs b/Dapper.Contrib/SqlMapperExtensions.Async.cs
index c93e39a4..cb152cf5 100644
--- a/Dapper.Contrib/SqlMapperExtensions.Async.cs
+++ b/Dapper.Contrib/SqlMapperExtensions.Async.cs
@@ -143,24 +143,7 @@ public static Task<int> InsertAsync<T>(this IDbConnection connection, T entityTo
             sqlAdapter ??= GetFormatter(connection);
 
             var isList = false;
-            if (type.IsArray)
-            {
-                isList = true;
-                type = type.GetElementType();
-            }
-            else if (type.IsGenericType)
-            {
-                var typeInfo = type.GetTypeInfo();
-                bool implementsGenericIEnumerableOrIsGenericIEnumerable =
-                    typeInfo.ImplementedInterfaces.Any(ti => ti.IsGenericType && ti.GetGenericTypeDefinition() == typeof(IEnumerable<>)) ||
-                    typeInfo.GetGenericTypeDefinition() == typeof(IEnumerable<>);
-
-                if (implementsGenericIEnumerableOrIsGenericIEnumerable)
-                {
-                    isList = true;
-                    type = type.GetGenericArguments()[0];
-                }
-            }
+            isList = IsArrayAndGetElementType(ref type);
 
             var name = GetTableName(type);
             var sbColumnList = new StringBuilder(null);
@@ -215,22 +198,7 @@ public static async Task<bool> UpdateAsync<T>(this IDbConnection connection, T e
 
             var type = typeof(T);
 
-            if (type.IsArray)
-            {
-                type = type.GetElementType();
-            }
-            else if (type.IsGenericType)
-            {
-                var typeInfo = type.GetTypeInfo();
-                bool implementsGenericIEnumerableOrIsGenericIEnumerable =
-                    typeInfo.ImplementedInterfaces.Any(ti => ti.IsGenericType && ti.GetGenericTypeDefinition() == typeof(IEnumerable<>)) ||
-                    typeInfo.GetGenericTypeDefinition() == typeof(IEnumerable<>);
-
-                if (implementsGenericIEnumerableOrIsGenericIEnumerable)
-                {
-                    type = type.GetGenericArguments()[0];
-                }
-            }
+            _ = IsArrayAndGetElementType(ref type);
 
             var keyProperties = KeyPropertiesCache(type).ToList();
             var explicitKeyProperties = ExplicitKeyPropertiesCache(type);
@@ -284,22 +252,7 @@ public static async Task<bool> DeleteAsync<T>(this IDbConnection connection, T e
 
             var type = typeof(T);
 
-            if (type.IsArray)
-            {
-                type = type.GetElementType();
-            }
-            else if (type.IsGenericType)
-            {
-                var typeInfo = type.GetTypeInfo();
-                bool implementsGenericIEnumerableOrIsGenericIEnumerable =
-                    typeInfo.ImplementedInterfaces.Any(ti => ti.IsGenericType && ti.GetGenericTypeDefinition() == typeof(IEnumerable<>)) ||
-                    typeInfo.GetGenericTypeDefinition() == typeof(IEnumerable<>);
-
-                if (implementsGenericIEnumerableOrIsGenericIEnumerable)
-                {
-                    type = type.GetGenericArguments()[0];
-                }
-            }
+            _ = IsArrayAndGetElementType(ref type);
 
             var keyProperties = KeyPropertiesCache(type);
             var explicitKeyProperties = ExplicitKeyPropertiesCache(type);
diff --git a/Dapper.Contrib/SqlMapperExtensions.cs b/Dapper.Contrib/SqlMapperExtensions.cs
index eb05d190..6416aea5 100644
--- a/Dapper.Contrib/SqlMapperExtensions.cs
+++ b/Dapper.Contrib/SqlMapperExtensions.cs
@@ -9,6 +9,7 @@
 using System.Threading;
 
 using Dapper;
+using System.Collections;
 
 namespace Dapper.Contrib.Extensions
 {
@@ -322,25 +323,7 @@ public static long Insert<T>(this IDbConnection connection, T entityToInsert, ID
             var isList = false;
 
             var type = typeof(T);
-
-            if (type.IsArray)
-            {
-                isList = true;
-                type = type.GetElementType();
-            }
-            else if (type.IsGenericType)
-            {
-                var typeInfo = type.GetTypeInfo();
-                bool implementsGenericIEnumerableOrIsGenericIEnumerable =
-                    typeInfo.ImplementedInterfaces.Any(ti => ti.IsGenericType && ti.GetGenericTypeDefinition() == typeof(IEnumerable<>)) ||
-                    typeInfo.GetGenericTypeDefinition() == typeof(IEnumerable<>);
-
-                if (implementsGenericIEnumerableOrIsGenericIEnumerable)
-                {
-                    isList = true;
-                    type = type.GetGenericArguments()[0];
-                }
-            }
+            isList = IsArrayAndGetElementType(ref type);
 
             var name = GetTableName(type);
             var sbColumnList = new StringBuilder(null);
@@ -386,6 +369,7 @@ public static long Insert<T>(this IDbConnection connection, T entityToInsert, ID
             if (wasClosed) connection.Close();
             return returnVal;
         }
+        
 
         /// <summary>
         /// Updates entity in table "Ts", checks if the entity is modified if the entity is tracked by the Get() extension.
@@ -404,23 +388,7 @@ public static bool Update<T>(this IDbConnection connection, T entityToUpdate, ID
             }
 
             var type = typeof(T);
-
-            if (type.IsArray)
-            {
-                type = type.GetElementType();
-            }
-            else if (type.IsGenericType)
-            {
-                var typeInfo = type.GetTypeInfo();
-                bool implementsGenericIEnumerableOrIsGenericIEnumerable =
-                    typeInfo.ImplementedInterfaces.Any(ti => ti.IsGenericType && ti.GetGenericTypeDefinition() == typeof(IEnumerable<>)) ||
-                    typeInfo.GetGenericTypeDefinition() == typeof(IEnumerable<>);
-
-                if (implementsGenericIEnumerableOrIsGenericIEnumerable)
-                {
-                    type = type.GetGenericArguments()[0];
-                }
-            }
+            _ = IsArrayAndGetElementType(ref type);
 
             var keyProperties = KeyPropertiesCache(type).ToList();  //added ToList() due to issue #418, must work on a list copy
             var explicitKeyProperties = ExplicitKeyPropertiesCache(type);
@@ -474,22 +442,7 @@ public static bool Delete<T>(this IDbConnection connection, T entityToDelete, ID
 
             var type = typeof(T);
 
-            if (type.IsArray)
-            {
-                type = type.GetElementType();
-            }
-            else if (type.IsGenericType)
-            {
-                var typeInfo = type.GetTypeInfo();
-                bool implementsGenericIEnumerableOrIsGenericIEnumerable =
-                    typeInfo.ImplementedInterfaces.Any(ti => ti.IsGenericType && ti.GetGenericTypeDefinition() == typeof(IEnumerable<>)) ||
-                    typeInfo.GetGenericTypeDefinition() == typeof(IEnumerable<>);
-
-                if (implementsGenericIEnumerableOrIsGenericIEnumerable)
-                {
-                    type = type.GetGenericArguments()[0];
-                }
-            }
+            IsArrayAndGetElementType(ref type);
 
             var keyProperties = KeyPropertiesCache(type).ToList();  //added ToList() due to issue #418, must work on a list copy
             var explicitKeyProperties = ExplicitKeyPropertiesCache(type);
@@ -532,6 +485,30 @@ public static bool DeleteAll<T>(this IDbConnection connection, IDbTransaction tr
             return deleted > 0;
         }
 
+        private static bool IsArrayAndGetElementType(ref Type type)
+        {
+            var isList = false;
+            if (type.IsArray)
+            {
+                isList = true;
+                type = type.GetElementType();
+            }
+            else if (type.IsGenericType)
+            {
+                var typeInfo = type.GetTypeInfo();
+                bool implementsGenericIEnumerableOrIsGenericIEnumerable =
+                    typeInfo.ImplementedInterfaces.Any(ti => ti.IsGenericType && ti.GetGenericTypeDefinition() == typeof(IEnumerable<>)) ||
+                    typeInfo.GetGenericTypeDefinition() == typeof(IEnumerable<>);
+
+                if (implementsGenericIEnumerableOrIsGenericIEnumerable)
+                {
+                    isList = true;
+                    type = type.GetGenericArguments()[0];
+                }
+            }
+            return isList;
+        }
+
         /// <summary>
         /// Specifies a custom callback that detects the database type instead of relying on the default strategy (the name of the connection type object).
         /// Please note that this callback is global and will be used by all the calls that require a database specific adapter.