检查dateTime是周末还是工作日

本文关键字：工作日 周末 检查 dateTime | 更新日期: 2023-09-27 18:09:02

<script Language="c#" runat="server">
  void Page_Load()
  {
   DateTime date = DateTime.Now;
   dateToday.Text = " " + date.ToString("d");
   DayOfWeek day = DateTime.Now.DayOfWeek;
   dayToday.Text = " " + day.ToString();
   if ((dayToday == DayOfWeek.Saturday) && (dayToday == DayOfWeek.Sunday))
    {
    Console.WriteLine("This is a weekend");
    }
 }
</script>

使用dateTime，我试图测试当前日期是工作日还是周末，然后我想打印响应给用户。目前我收到一个运行时错误。如果我删除我的If语句，第一项(当前日期和星期几)将正确打印。

检查dateTime是周末还是工作日

你在下面的if语句中写错了变量:

if ((dayToday == DayOfWeek.Saturday) || (dayToday == DayOfWeek.Sunday))
{
    Console.WriteLine("This is a weekend");
}

代替dayToday必须在条件中使用day变量。

更新:你在条件上也犯了错误。必须有or而不是and

正确的代码是 
if ((day == DayOfWeek.Saturday) || (day == DayOfWeek.Sunday))
{
    Console.WriteLine("This is a weekend");
}

你正在比较你的ASP。. NET标签dayToday对DayOfWeek的枚举元素，当然失败

可能你想用day替换dayToday在你的if语句，即从

if ((dayToday == DayOfWeek.Saturday) && (dayToday == DayOfWeek.Sunday))


if ((day == DayOfWeek.Saturday) && (day == DayOfWeek.Sunday))

此外，您可能还希望将逻辑'and' (&&)替换为逻辑'or' (||)以最终

if ((day == DayOfWeek.Saturday) || (day == DayOfWeek.Sunday))

if ((day >= DayOfWeek.Monday) && (day<= DayOfWeek.Friday))
{
    // action
}

您收到一个错误，因为您正在比较枚举和字符串。

// dayToday is a string
// DayOfWeek.Saturday is an enum
if ((dayToday == DayOfWeek.Saturday) && (dayToday == DayOfWeek.Sunday))

使用DayOfWeek.Saturday.ToString()与字符串进行比较。您也不希望填充dayToday字符串。或者，使用day变量与enum进行比较。

https://dotnetfiddle.net/gUGJ0J 

using System;
public class Program
{
    public static void Main()
    {
        DateTime date = DateTime.Now;
        string dateToday = date.ToString("d");
        DayOfWeek day = DateTime.Now.DayOfWeek;
        string dayToday = day.ToString();
        // compare enums
        if ((day == DayOfWeek.Saturday) || (day == DayOfWeek.Sunday))
        {
            Console.WriteLine(dateToday + " is a weekend");
        }
        else
        {
            Console.WriteLine(dateToday + " is not a weekend");
        }
        // compare strings
        if ((dayToday == DayOfWeek.Saturday.ToString()) || (dayToday == DayOfWeek.Sunday.ToString()))
        {
            Console.WriteLine(dateToday + " is a weekend");
        }
        else
        {
            Console.WriteLine(dateToday + " is not a weekend");
        }
    }
}

        List<DateTime> datelist = new List<DateTime>();
        int balanceday = 1;
        while (datelist.Count < 10)
        {
            DateTime day = DateTime.Now.AddDays(balanceday + datelist.Count).Date;
            if (day.DayOfWeek != DayOfWeek.Saturday && day.DayOfWeek != DayOfWeek.Sunday)
            {
                datelist.Add(day);
            }
            else
            {
                balanceday++;
            }
        }

你需要用runat="server"把你的asp控件放在form标签内。

<body>
    <form id="frm" runat="server">
    <p>
    Today's date is: <asp:Label ID="dateToday" runat="server" />
    <br/>
    The day of the week is: <asp:Label ID="dayToday" runat="server" />
    <br/>
    </form>
</body>

Page_Load方法的签名在你的代码中不正确。此外，你应该使用Response.Write的asp网站，而不是Console.Writeline。当您检查星期几时，应该使用OR(||)而不是AND(&&)。

 <script language="c#" runat="server">
            protected void Page_Load(object sender, EventArgs e)
            {
                DateTime date = DateTime.Now;
                dateToday.Text = " " + date.ToString("d");
                DayOfWeek day = DateTime.Now.DayOfWeek;
                dayToday.Text = " " + day.ToString();
                if ((dayToday.Text == DayOfWeek.Saturday.ToString()) || (dayToday.Text == DayOfWeek.Sunday.ToString()))
                {
                    Response.Write("This is a weekend");
                }
            }
        </script>
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