c# - 从枚举中打印工作日

Question

作为编程新手，我的问题可能看起来有点基础，我想要的是使用循环或其他方式打印枚举中提到的所有日期。我已经使用了一个控制台应用程序。非常感谢有关提高 C# 语言编码能力基础知识的提示以及答案。

using System;

namespace _28_11_2016_enum
{
class Program
{
    static void Main(string[] args)
    {
        weekdays wd = weekdays.mon;

        for (int i = 0; i < 7; i++)
        {


            int a = (int)wd;
            a = a + i;
            wd = (wd)a;// faulty code.
            Console.WriteLine(wd);
        }
        Console.Read();
    }
    enum weekdays : int
    {
        mon, tue, wed, thur, fri, sat, sun
    }
}

Answer 1

您不必循环 - Enum.GetNames 返回名称，然后 string.Join 将它们连接成一个 string :

 // mon, tue, wed, thur, fri, sat, sun
 Console.Write(string.Join(", ", Enum.GetNames(typeof(weekdays))));

如果你想要 int 值:

 // 0, 1, 2, 3, 4, 5, 6
 Console.Write(string.Join(", ", Enum.GetValues(typeof(weekdays)).Cast<int>()));

编辑:如果你坚持循环我建议foreach一个:

 // mon == 0 ... sun == 6
 foreach (var item in Enum.GetValues(typeof(weekdays))) {
   Console.WriteLine($"{item} == {(int) item}"); 
 }

在 for 循环的情况下

 // do not use magic numbers - 0..7 but actual values weekdays.mon..weekdays.sun 
 for (weekdays item = weekdays.mon; item <= weekdays.sun; ++item) {
   Console.WriteLine($"{item} == {(int) item}"); 
 } 

但是，在实际应用中，请使用标准 DayOfWeek 枚举。

编辑 2:您自己的代码(在问题中)得到改进:

 static void Main(string[] args) {
   for (int i = 0; i < 7; i++) { // do not use magic numbers: what does, say, 5 stand for?
     // we want weekdays, not int to be printed out
     weekdays wd = (weekdays) i;

     Console.WriteLine(wd);
   }

   Console.Read();
 }

编辑 3:您自己的代码(在答案中)得到改进:

 // you have to do it just once, that's why pull the line off the loop 
 string[] s = Enum.GetNames(typeof(weekdays));

 // do not use magic numbers - 7: what does "7" stands for? - 
 // but actual value: s.Length - we want to print out all the items
 // of "s", i.e. from 0 up to s.Length    
 for (int i = 0; i < s.Length; i++)
   Console.WriteLine(s[i]);