diff --git a/Src/Asp.NetCore2/SqlSugar/Realization/SqlServer/SqlBuilder/SqlServerFastBuilder.cs b/Src/Asp.NetCore2/SqlSugar/Realization/SqlServer/SqlBuilder/SqlServerFastBuilder.cs
index 643acee0f..00000545c 100644
--- a/Src/Asp.NetCore2/SqlSugar/Realization/SqlServer/SqlBuilder/SqlServerFastBuilder.cs
+++ b/Src/Asp.NetCore2/SqlSugar/Realization/SqlServer/SqlBuilder/SqlServerFastBuilder.cs
@@ -67,7 +67,7 @@ namespace SqlSugar
             copy.BulkCopyTimeout = this.Context.Ado.CommandTimeOut;
             return copy;
         }
-        public override Task<int> Merge<T>(DataTable dt, EntityInfo entityInfo, string[] whereColumns, string[] updateColumns, List<T> datas) where  T : class 
+        public override Task<int> Merge<T>(DataTable dt, EntityInfo entityInfo, string[] whereColumns, string[] updateColumns, List<T> datas)  
         {
             var sqlBuilder = this.Context.Queryable<object>().SqlBuilder;
             var insertColumns = entityInfo.Columns