Question

我有一个应用程序，它显示特定区域代码的时区时间，该区号的时间以及将根据从上午8点到晚上8点的时间显示的消息。我遇到的问题是让应用程序显示基于区号而不是PC上当前时间显示的时间消息。我知道我的代码不正确，因为它使用了 DateTime.Now 而不是我的数字时钟标签的时间，而是由特定区域代码的时区选择。这是我的代码，问题出在我解析DateTime的if语句中。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace TimeZone
{
public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void areaCodeDataBaseTableBindingNavigatorSaveItem_Click(object sender, EventArgs e)
    {
        this.Validate();
        this.areaCodeDataBaseTableBindingSource.EndEdit();
        this.tableAdapterManager.UpdateAll(this.areaCodeDataBaseDataSet);

    }

    private void Form1_Load(object sender, EventArgs e)
    {
        // TODO: This line of code loads data into the 'areaCodeDataBaseDataSet.AreaCodeDataBaseTable' table. 
        //You can move, or remove it, as needed.
        this.areaCodeDataBaseTableTableAdapter.Fill(this.areaCodeDataBaseDataSet.AreaCodeDataBaseTable);

    }

    private void DigitalClock_Load(object sender, EventArgs e)
    {
        Timer t = new Timer();
        t.Tick += new EventHandler(t_Tick);
        t.Interval = 1000;
        t.Enabled = true;
    }        

    public void t_Tick(Object Sender, EventArgs e)
    {            
        DateTime start = DateTime.Parse("08:00 am");
        DateTime end = DateTime.Parse("08:00 pm").AddHours(10);

        if (time_ZoneLabel1.Text == "Eastern")
        {
            DigitalClock.Text = DateTime.UtcNow.AddHours(19).ToLongTimeString();
            DigitalClock2.Text = "";
        }
        if (time_ZoneLabel1.Text == "Central")
        {
            DigitalClock.Text = DateTime.UtcNow.AddHours(18).ToLongTimeString();
            DigitalClock2.Text = "";
        }
        if (time_ZoneLabel1.Text == "Mountain")
        {
            DigitalClock.Text = DateTime.UtcNow.AddHours(17).ToLongTimeString();
            DigitalClock2.Text = "";
        }
        if (time_ZoneLabel1.Text == "Pacific")
        {
            DigitalClock.Text = DateTime.UtcNow.AddHours(16).ToLongTimeString();
            DigitalClock2.Text = "";
        }
        if (time_ZoneLabel1.Text == "Atlantic")
        {
            DigitalClock.Text = DateTime.UtcNow.AddHours(20).ToLongTimeString();
            DigitalClock2.Text = "";
        }
        if (time_ZoneLabel1.Text == "Hawaii-Aleutian")
        {
            DigitalClock.Text = DateTime.UtcNow.AddHours(14).ToLongTimeString();
            DigitalClock2.Text = "";
        }
        if (time_ZoneLabel1.Text == "Eastern/Central")
        {
            DigitalClock.Text = DateTime.UtcNow.AddHours(19).ToLongTimeString();
            DigitalClock2.Text = DateTime.UtcNow.AddHours(18).ToLongTimeString();
        }
        if (time_ZoneLabel1.Text == "Central/Mountain")
        {
            DigitalClock.Text = DateTime.UtcNow.AddHours(18).ToLongTimeString();
            DigitalClock2.Text = DateTime.UtcNow.AddHours(17).ToLongTimeString();
        }
        if (time_ZoneLabel1.Text == "Mountain/Pacific")
        {
            DigitalClock.Text = DateTime.UtcNow.AddHours(17).ToLongTimeString();
            DigitalClock2.Text = DateTime.UtcNow.AddHours(16).ToLongTimeString();
        }
        if (time_ZoneLabel1.Text == "UTC+10")
        {
            DigitalClock.Text = DateTime.UtcNow.AddHours(10).ToLongTimeString();
            DigitalClock2.Text = "";
        }
        if (time_ZoneLabel1.Text == "UTC-10")
        {
            DigitalClock.Text = DateTime.UtcNow.AddHours(20).ToLongTimeString();
            DigitalClock2.Text = "";
        }
        if (time_ZoneLabel1.Text == "")
        {
            DigitalClock.Text = "";
            DigitalClock2.Text = "";                
        }
        if (DateTime.Parse(DigitalClock.Text) > start && (DateTime.Parse(DigitalClock.Text) < end))
        {
            warningLabel.ForeColor = Color.Green;
            warningLabel.Text = "OK To Call";
        }
        else
        {
            warningLabel.ForeColor = Color.Red;
            warningLabel.Text = "Do Not Call";
        }
        if (DigitalClock.Text == "")
        {
            warningLabel.Text = "";
        }        
    }        

    private void exitButton_Click(object sender, EventArgs e)
    {
        Application.Exit();
    }               

}
} code here

Answer 1

您正在使用不同的方法在不同的地方进行转换，这有点令人困惑。考虑重新编写代码，以便使用时区来确定偏移量，如下所示：

int HoursOffset = 0;
switch (time_ZoneLabel1)
{
    case "Eastern" :
        HoursOffset = 19;
        break;
    case "Central" :
        HoursOffset = 18;
        break;
    // etc, for all your timezones
}

现在，在那个地方抽出时间：

DateTime currentLocalTime = DateTime.UtcNow.AddHours(HoursOffset);

然后您可以设置数字时钟文本：

DigitalClock.Text = currentLocalTime.ToLongTimeString();

现在，要确定您是否可以致电，您可以将Hour的{{1}}值与开始和结束时间进行比较：

currentLocalTime

或者，您可以考虑使用DateTimeOffset来减少使用时区时遇到的一些混淆。

显示基于时区输入的消息

1 个答案: