Question

<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，然后我想将响应打印给用户。目前我收到运行时错误。如果我删除了我的if语句，则第一项（当前日期和星期几）打印正确。

Answer 1

你在以下if语句中写错了varable：

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

而不是 dayToday ，您必须在条件中使用 day varable。

<强>更新你在条件上犯了错误。必须有or而不是and。

Answer 2

您正在将ASP.NET标签import java.util.Arrays; import java.util.HashSet; import java.util.Scanner; import java.util.Set; public class ArrayWith10Numbers { public static void main(String[] args) { Scanner input = new Scanner(System.in); Integer[] myArray = new Integer[10]; System.out.print("Enter " + myArray.length + " values: "); for (int i = 0; i < 10; i++) { myArray[i] = input.nextInt(); } Set<Integer> set = new HashSet<>(); set.addAll(Arrays.asList(myArray)); System.out.println("Without duplicates"); for (Integer val : set) System.out.println(val); } }与dayToday的枚举元素进行比较，这当然是失败的

您可能希望在DayOfWeek声明中将dayToday替换为day，即来自

if

到

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

此外，您可能还想更换逻辑＆＃39;和＆＃39; （if ((day == DayOfWeek.Saturday) && (day == DayOfWeek.Sunday))）与逻辑＆＃39;或＆＃39; （&&）到最后

||

Answer 3

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

Answer 4

您收到错误是因为您要将枚举与字符串进行比较。

// 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。您还希望不填充dayToday字符串。或者，使用day变量与枚举进行比较。

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");
        }
    }
}

Answer 5

您需要将asp控件放在form标签内，并使用runat =“server”。

<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>

代码中Page_Load方法的签名不正确。此外，您应该将Response.Write用于asp网站而不是Console.Writeline。当您检查星期几时，应该有OR（||）而不是AND（＆amp;＆amp;）。

 <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>

Answer 6

        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++;
            }
        }

检查dateTime是周末还是工作日

6 个答案: