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SqlDataAdapter sda = new SqlDataAdapter("SELECT BillDate,BillCode FROM vBillIndex WHERE BillDate = '" + this.dateTimePicker1.Value.ToString("yyyy-MM-dd 00:00:00") + "'", conn);
SQL :SELECT BillDate,BillCode FROM vBillIndex WHERE BillDate = '2020-07-16 00:00:00'
执行SQL是可以的 SqlDataAdapter sda = new SqlDataAdapter( $"SELECT BillDate,BillCode FROM vBillIndex WHERE BillDate = '{this.dateTimePicker1.Value.ToString("yyyy-MM-dd 00:00:00")}'", conn);//读取表数据
