日期时间转换/魔法

发布于 2024-09-24 13:30:51 字数 226 浏览 2 评论 0原文

有没有一种简洁的方法可以用 C# 编写这个逻辑？

if ((DateTime.Now >= "8:00 AM") && (DateTime.Now < 5:00 PM))
{// do something}

我正在制作一个演示应用程序，我想在工作日做一些事情，但我不希望这段代码太突出（大量转换=糟糕）。（因为我希望我的演示内容更容易看到。

原文

Is there a nice concise way to write this logic in C#?

if ((DateTime.Now >= "8:00 AM") && (DateTime.Now < 5:00 PM))
{// do something}

I am making a demo app where I want to make something happen in the work day, but I don't want this code to stand out much (a lot of casting = bad). (Because I want my demo stuff to be easier to see.

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魔 2024-10-01 13:30:51

好吧，你可以这样做：

DateTime now = DateTime.Now;
if (now.Hour < 8 || now.Hour >= 17)

请注意，我通常更喜欢只使用 DateTime.Now 属性一次，将结果复制到上面的局部变量中 - 这样你就不会'由于呼叫之间的时间变化，不会出现奇怪的可能性。这里不是问题，但在其他情况下可能会出现问题。

如果您想以这种方式处理事情，另一种可能性是使用DateTime.TimeOfDay。我认为上面的内容已经很简单了。

编辑：史蒂文指出我改变了 &&按照你原来的逻辑 || - 你原来的逻辑永远不会起作用，因为它永远不可能在上午 8 点之前和下午 5 点之后。上面的内容适用于“如果不是在工作日” - 如果您想要“如果是在工作日”，您只需要：

DateTime now = DateTime.Now;
if (now.Hour >= 8 && now.Hour < 17)

Well, you could do:

DateTime now = DateTime.Now;
if (now.Hour < 8 || now.Hour >= 17)

Note that I generally prefer to only use the DateTime.Now property once, copying the result into the local variable as above - that way you don't get odd possibilities due to the time changing between calls. Not a problem here, but it could be in other cases.

Another possibility is to use DateTime.TimeOfDay if you want to handle things that way. I think the above is about as simple as it gets though.

EDIT: Steven pointed out that I changed the && in your original logic to || - your original logic can never work, as it can never be before 8am and after 5pm. The above works for "if it's not in the working day" - if you want "if it is in the working day" you just need:

DateTime now = DateTime.Now;
if (now.Hour >= 8 && now.Hour < 17)

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灯角 2024-10-01 13:30:51

我想你想在这里做的是这样的：

var now = DateTime.Now;
if (now.Hour >= 8 && now.Hour < 17)

I think what you want to do here is something like this:

var now = DateTime.Now;
if (now.Hour >= 8 && now.Hour < 17)

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怪我太投入 2024-10-01 13:30:51

如果你想让它变得“漂亮”，你还可以使用扩展方法：

public static class DateTimeHelper
{
    public static DateTime Time(this string time)
    {
        DateTime theTime = DateTime.Parse(time);
        return theTime;
    }
}

...

   if (DateTime.Now < "8:00 AM".Time() && DateTime.Now > "5:00 PM".Time())
   {
        // do something
   }

If you wanted to make it "pretty" you could also use an extension method:

public static class DateTimeHelper
{
    public static DateTime Time(this string time)
    {
        DateTime theTime = DateTime.Parse(time);
        return theTime;
    }
}

...

   if (DateTime.Now < "8:00 AM".Time() && DateTime.Now > "5:00 PM".Time())
   {
        // do something
   }

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大姐，你呐 2024-10-01 13:30:51

如果您可以将字符串格式化为当前日期和开始/结束时间的正确格式，则可以使用类似的内容。

DateTime now = DateTime.Now;
DateTime start = Convert.ToDateTime(now.Date.ToShortDateString() + " 8:00:00 AM");
DateTime end = Convert.ToDateTime(now.Date.ToShortDateString() + " 5:00:00 PM");
if (now >= start && now < end)
{

}

我仍然认为使用其他人发布的小时方法更干净，但这种方法提供的答案类似于您提出问题的方式。

If you can format a string in the right format for the current date and start / end times you can use something like this.

DateTime now = DateTime.Now;
DateTime start = Convert.ToDateTime(now.Date.ToShortDateString() + " 8:00:00 AM");
DateTime end = Convert.ToDateTime(now.Date.ToShortDateString() + " 5:00:00 PM");
if (now >= start && now < end)
{

}

I still think it's cleaner to use the hour method posted by others, but this is a method that provides an answer similar to how you asked your question.

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