SqlBluckCopy 保存大数据

 DataTable dt = new DataTable();
            dt.Columns.Add("UserName", typeof(string));
            dt.Columns.Add("Age", typeof(int));
            dt.Rows.Add("zzq1", 19);
            dt.Rows.Add("zzq2", 20);
            using (System.Data.SqlClient.SqlBulkCopy bcp = new System.Data.SqlClient.SqlBulkCopy("Data Source=.;Initial Catalog=Test;Integrated Security=True"))
            {
                //指定目标数据库的表名
                bcp.DestinationTableName = "UserInfo";

                //建立数据源表字段和目标表中的列之间的映射
                bcp.ColumnMappings.Add("UserName", "UserName");
                bcp.ColumnMappings.Add("Age", "Age");

                //写入数据库表 dt 是数据源DataTable
                bcp.WriteToServer(dt);                
                //关闭SqlBulkCopy实例
                bcp.Close();
            }

            //using (SqlConnection conn = new SqlConnection("Data Source=.;Initial Catalog=Test;Integrated Security=True"))
            //{
            //    string sql = "Delete [Test].[dbo].[UserInfo]";
            //    using (SqlCommand com = new SqlCommand(sql, conn))
            //    {
            //        conn.Open();
            //        object obj = com.ExecuteScalar();
            //    }
            //}