Question

我想找到两个DateTime值之间的总天数。所以我创建了执行减法的totaldays：

TimeSpan totaldays = enddatedata - startdatedata;

我想将TimeSpan四舍五入到第一个整数，例如13而不是13：00：00：00，因为我想将值13添加到数据库中。出于测试目的，我使用标签来显示结果：

lbltotaldays.Text = (totaldays.ToString());

如何将值四舍五入到第一个数字？

    protected void insertbutton_Click(object sender, EventArgs e)
    {

        int? recurrencedata = Convert.ToInt32(ddlRecurrence.Text);
        if (recurrencedata == 1)
        {
            int moduledata = Convert.ToInt32(ddlModule.Text);
            DateTime startdatedata = Convert.ToDateTime(txtstartdate.Text);
            DateTime enddatedata = Convert.ToDateTime(txtenddate.Text);
            int classtypedata = Convert.ToInt32(ddlClassType.Text);
            int roomcodedata = Convert.ToInt32(ddlRoomCode.Text);
            int starttimedata = Convert.ToInt32(ddlStartClassTime.Text);
            int endtimedata = Convert.ToInt32(ddlEndClassTime.Text);

            startdatedata = DateTime.Parse(txtstartdate.Text).Date;
            enddatedata = DateTime.Parse(txtenddate.Text).Date;
            TimeSpan totaldays = enddatedata - startdatedata;

            string DefaultConnection = WebConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString;
            SqlConnection myConnection = new SqlConnection(DefaultConnection);

            myConnection.Open();

            string query = "INSERT INTO Class (ModuleId, ClassTypeId,  ClassScheduleStartTimeId, ClassScheduleEndTimeId, RoomCodeId, StartTime, EndTime, RecurrenceId, TotalDayNumber) VALUES ( @moduledata, @classtypedata, @starttimedata, @endtimedata, @roomcodedata, @startdatedata, @enddatedata,  @recurrencedata, @totaldaynumberdata)";

            SqlCommand myCommand = new SqlCommand(query, myConnection);
            myCommand.Parameters.AddWithValue("@moduledata", moduledata);
            myCommand.Parameters.AddWithValue("@classtypedata", classtypedata);
            myCommand.Parameters.AddWithValue("@startdatedata", startdatedata);
            myCommand.Parameters.AddWithValue("@enddatedata", enddatedata);
            myCommand.Parameters.AddWithValue("@starttimedata", starttimedata);
            myCommand.Parameters.AddWithValue("@roomcodedata", roomcodedata);
            myCommand.Parameters.AddWithValue("@endtimedata", endtimedata);
            myCommand.Parameters.AddWithValue("@recurrencedata", recurrencedata);
            myCommand.Parameters.AddWithValue("@totaldaynumberdata", totaldays);
            myCommand.ExecuteNonQuery();
            myConnection.Close();

            SuccessPanel.Visible = true;
            lbltotaldays.Text = (totaldays.ToString());
        }
    }
}

Answer 1

如果您希望从TimeSpan获取完整天数，请使用其Days属性：

lbltotaldays.Text = totaldays.Days.ToString();

这将忽略小时数，因此，例如，13天22小时5分钟将产生13。

如果您想将13½天视为14天，请致电TotalDays财产上的Math.Round：

lbltotaldays.Text = ((int)Math.Round(totaldays.TotalDays, MidpointRounding.AwayFromZero)).ToString();

将TimeSpan值舍入为第一个整数

1 个答案: