From 957be334b47f0333668625fc6e4a683b946b92c1 Mon Sep 17 00:00:00 2001
From: sunkaixuan <610262374@qq.com>
Date: Tue, 16 Jul 2024 13:55:08 +0800
Subject: [PATCH] Synchronization code

---
 .../SqlSugar/Abstract/FastestProvider/FastestProvider.cs   | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Src/Asp.Net/SqlSugar/Abstract/FastestProvider/FastestProvider.cs b/Src/Asp.Net/SqlSugar/Abstract/FastestProvider/FastestProvider.cs
index 3e6664021..2babbbe3a 100644
--- a/Src/Asp.Net/SqlSugar/Abstract/FastestProvider/FastestProvider.cs
+++ b/Src/Asp.Net/SqlSugar/Abstract/FastestProvider/FastestProvider.cs
@@ -280,7 +280,12 @@ namespace SqlSugar
             foreach (DataColumn item in dataTable.Columns)
             {
                 var isPrimaryKey = whereColumns.Any(it => it.EqualCase(item.ColumnName));
-                builder.CreateProperty(item.ColumnName,typeof(Nullable<>).MakeGenericType(item.DataType), new SugarColumn()
+                var propertyType = item.DataType;
+                if (!propertyType.IsClass()&& propertyType!=typeof(string) && propertyType != typeof(byte[]))
+                {
+                    propertyType=typeof(Nullable<>).MakeGenericType(UtilMethods.GetUnderType(item.DataType));
+                }
+                builder.CreateProperty(item.ColumnName, propertyType, new SugarColumn()
                 {
                     IsPrimaryKey = isPrimaryKey,
                     IsIdentity=isIdentity&& isPrimaryKey,