C# Online Compiler | .NET Fiddle

<no name> by Anonymous

using System;
using System.Collections.Generic;
using System.Linq;

var morning = new Shift();
morning.SN = 1;
morning.Name = "早班";
morning.Start = new TimeSpan(8, 0, 0);
morning.End = new TimeSpan(17, 0, 0);

var night = new Shift();
night.SN = 2;
night.Name = "晚班";
night.Start = new TimeSpan(17, 0, 0);
night.End = new TimeSpan(1, 0, 0, 0);

var graveyard = new Shift();
graveyard.SN = 3;
graveyard.Name = "大夜班";
graveyard.Start = new TimeSpan(1, 0, 0, 0);
graveyard.End = new TimeSpan(1, 7, 0, 0);

Console.WriteLine (morning.Name);
Console.WriteLine (morning.StartStr);
Console.WriteLine (morning.EndStr);

Console.WriteLine (night.Name);
Console.WriteLine (night.StartStr);
Console.WriteLine (night.EndStr);

Console.WriteLine (graveyard.Name);
Console.WriteLine (graveyard.StartStr);
Console.WriteLine (graveyard.EndStr);

List<Shift> shift_list = new List<Shift>();
shift_list.Add(morning);
shift_list.Add(night);
shift_list.Add(graveyard);
Console.WriteLine (shift_list.Count());

Shift current_shift = null;
var now = new DateTime(2023, 4, 15, 01, 18, 00);//var now = DateTime.Now;
foreach (var shift in shift_list)
{
	var start = DateTime.Today.Add(shift.Start);
	var end = DateTime.Today.Add(shift.End);
	if (start <= now && now <= end)
	{
		current_shift = shift;
		break;
	}

	//跨夜班必須昨天日期來算
	start = DateTime.Today.AddDays(-1).Add(shift.Start);
	end = DateTime.Today.AddDays(-1).Add(shift.End);
	if (start <= now && now <= end)
	{
		current_shift = shift;
		break;
	}
}

if (current_shift == null)
	Console.WriteLine($"current_shift: null");
else
	Console.WriteLine($"current_shift: {current_shift.Name}");

Shift prev_shift = shift_list.First();
bool isChange = false;
if (shift_list.Count == 1)
{
	Console.WriteLine($"ct: {shift_list.Where(x => x.End < current_shift.End).Count()}");
	prev_shift = shift_list.Where(x => x.End < current_shift.End).OrderByDescending(x => x.End).First();
}
else
{
	foreach (var shift in shift_list)
	{
		var end = DateTime.Today.Add(shift.End);
		if (now > end && end < DateTime.Today.Add(prev_shift.End))
		{
			prev_shift = shift;
			isChange = true;
		}
	}
	if (!isChange)
	{
		foreach (var shift in shift_list)
		{
			var end = DateTime.Today.AddDays(-1).Add(shift.End);
			if (now > end && end < DateTime.Today.AddDays(-1).Add(prev_shift.End))
			{
				prev_shift = shift;
			}
		}
	}
}

Console.WriteLine($"prev_shift: {prev_shift.Name}");


class Shift
{
    public int SN { get; set; }
    public string Name { get; set; }
    public TimeSpan Start { get; set; }
    public TimeSpan End { get; set; }
	
	public string StartStr
	{
		get => $"{Start.Hours:00}:{Start.Minutes:00}:{Start.Seconds:00}";
	}
	
	public string EndStr
	{
		get
		{
			var result = $"{End.Hours:00}:{End.Minutes:00}:{End.Seconds:00}";
			if (End.Days == 1)
			{
				if (End == new TimeSpan(1, 0, 0, 0))
					result = "24:00:00";
				else
					result = "隔日" + result;
			}
			else if (End.Days > 1)
				result = End.Days + "日後" + result;
			return result;
		}
	}
}

​x
 
using System;
using System.Collections.Generic;
using System.Linq;
​
var morning = new Shift();
morning.SN = 1;
morning.Name = "早班";
morning.Start = new TimeSpan(8, 0, 0);
morning.End = new TimeSpan(17, 0, 0);
​
var night = new Shift();
night.SN = 2;
night.Name = "晚班";
night.Start = new TimeSpan(17, 0, 0);
night.End = new TimeSpan(1, 0, 0, 0);
​
var graveyard = new Shift();
graveyard.SN = 3;
graveyard.Name = "大夜班";
graveyard.Start = new TimeSpan(1, 0, 0, 0);
graveyard.End = new TimeSpan(1, 7, 0, 0);
​
Console.WriteLine (morning.Name);
Console.WriteLine (morning.StartStr);
Console.WriteLine (morning.EndStr);
​
Console.WriteLine (night.Name);
Console.WriteLine (night.StartStr);
Console.WriteLine (night.EndStr);
​
Console.WriteLine (graveyard.Name);
Console.WriteLine (graveyard.StartStr);
Console.WriteLine (graveyard.EndStr);
​
List<Shift> shift_list = new List<Shift>();
shift_list.Add(morning);
shift_list.Add(night);
shift_list.Add(graveyard);
Console.WriteLine (shift_list.Count());
​
Shift current_shift = null;
var now = new DateTime(2023, 4, 15, 01, 18, 00);//var now = DateTime.Now;
foreach (var shift in shift_list)
{
    var start = DateTime.Today.Add(shift.Start);
    var end = DateTime.Today.Add(shift.End);
    if (start <= now && now <= end)
    {
        current_shift = shift;
        break;
    }
​
    //跨夜班必須昨天日期來算
    start = DateTime.Today.AddDays(-1).Add(shift.Start);
    end = DateTime.Today.AddDays(-1).Add(shift.End);
    if (start <= now && now <= end)
    {
        current_shift = shift;
        break;
    }
}
​
if (current_shift == null)
    Console.WriteLine($"current_shift: null");
else
    Console.WriteLine($"current_shift: {current_shift.Name}");
​
Shift prev_shift = shift_list.First();
bool isChange = false;
if (shift_list.Count == 1)
{
    Console.WriteLine($"ct: {shift_list.Where(x => x.End < current_shift.End).Count()}");
    prev_shift = shift_list.Where(x => x.End < current_shift.End).OrderByDescending(x => x.End).First();
}
else
{
    foreach (var shift in shift_list)
    {
        var end = DateTime.Today.Add(shift.End);
        if (now > end && end < DateTime.Today.Add(prev_shift.End))
        {
            prev_shift = shift;
            isChange = true;
        }
    }
    if (!isChange)
    {
        foreach (var shift in shift_list)
        {
            var end = DateTime.Today.AddDays(-1).Add(shift.End);
            if (now > end && end < DateTime.Today.AddDays(-1).Add(prev_shift.End))
            {
                prev_shift = shift;
            }
        }
    }
}
​
Console.WriteLine($"prev_shift: {prev_shift.Name}");
​
​
class Shift
{
    public int SN { get; set; }
    public string Name { get; set; }
    public TimeSpan Start { get; set; }
    public TimeSpan End { get; set; }
    
    public string StartStr
    {
        get => $"{Start.Hours:00}:{Start.Minutes:00}:{Start.Seconds:00}";
    }
    
    public string EndStr
    {
        get
        {
            var result = $"{End.Hours:00}:{End.Minutes:00}:{End.Seconds:00}";
            if (End.Days == 1)
            {
                if (End == new TimeSpan(1, 0, 0, 0))
                    result = "24:00:00";
                else
                    result = "隔日" + result;
            }
            else if (End.Days > 1)
                result = End.Days + "日後" + result;
            return result;
        }
    }
}

Compilation error (line 44, col 36): The type or namespace name 'Controller' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 9, col 16): The type or namespace name 'Guid' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 23, col 35): The type or namespace name 'IdentityRole' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 23, col 30): The type or namespace name 'List' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 23, col 62): The type or namespace name 'UserProfile' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 33, col 21): The type or namespace name 'IdentityRole' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 33, col 16): The type or namespace name 'List' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 34, col 16): The type or namespace name 'List' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 35, col 16): The type or namespace name 'UserProfile' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 48, col 38): The type or namespace name 'ApplicationUser' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 48, col 26): The type or namespace name 'RoleManager' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 49, col 38): The type or namespace name 'ApplicationUser' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 49, col 26): The type or namespace name 'UserManager' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 55, col 44): The type or namespace name 'ApplicationUser' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 55, col 32): The type or namespace name 'UserManager' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 55, col 86): The type or namespace name 'ApplicationUser' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 55, col 74): The type or namespace name 'RoleManager' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 66, col 47): The type or namespace name 'Guid' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 66, col 27): The type or namespace name 'IActionResult' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 66, col 22): The type or namespace name 'Task' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 78, col 47): The type or namespace name 'UserViewModel' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 78, col 27): The type or namespace name 'IActionResult' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 78, col 22): The type or namespace name 'Task' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 65, col 10): The type or namespace name 'HttpGet' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 65, col 10): The type or namespace name 'HttpGetAttribute' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 77, col 10): The type or namespace name 'HttpPost' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 77, col 10): The type or namespace name 'HttpPostAttribute' could not be found (are you missing a using directive or an assembly reference?)

Last Run:	2:10:12 pm
Compile:	0s
Execute:	0.205s
Memory:	0b
CPU:	0s

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