[英]How can I clone a DateTime object in C#?
如何在C#中克隆DateTime对象?
DateTime is a value type ( struct
) DateTime是一个值类型 (
struct
)
This means that the following creates a copy: 这意味着以下内容创建了一个副本:
DateTime toBeClonedDateTime = DateTime.Now;
DateTime cloned = toBeClonedDateTime;
You can also safely do things like: 您还可以安全地执行以下操作:
var dateReference = new DateTime(2018, 7, 29);
for (var h = 0; h < 24; h++) {
for (var m = 0; m < 60; m++) {
var myDateTime = dateReference.AddHours(h).AddMinutes(m);
Console.WriteLine("Now at " + myDateTime.ToShortDateString() + " " + myDateTime.ToShortTimeString());
}
}
Note how in the last example myDateTime
gets declared anew in each cycle; 注意在最后一个例子中
myDateTime
如何在每个循环中重新声明; if dateReference
had been affected by AddHours()
or AddMinutes()
, myDateTime
would've wandered off really fast – but it doesn't, because dateReference
stays put: 如果
dateReference
受AddHours()
或AddMinutes()
, myDateTime
会非常快地离开 - 但它没有,因为dateReference
保持put:
Now at 2018-07-29 0:00
Now at 2018-07-29 0:01
Now at 2018-07-29 0:02
Now at 2018-07-29 0:03
Now at 2018-07-29 0:04
Now at 2018-07-29 0:05
Now at 2018-07-29 0:06
Now at 2018-07-29 0:07
Now at 2018-07-29 0:08
Now at 2018-07-29 0:09
...
Now at 2018-07-29 23:55
Now at 2018-07-29 23:56
Now at 2018-07-29 23:57
Now at 2018-07-29 23:58
Now at 2018-07-29 23:59
var original = new DateTime(2010, 11, 24);
var clone = original;
DateTime
is a value type, so when you assign it you also clone it. DateTime
是一个值类型,因此在分配时也可以克隆它。 That said, there's no point in cloning it because it's immutable; 也就是说,克隆它是没有意义的,因为它是不可改变的; typically you'd only clone something if you had the intention of changing one of the copies.
通常,如果您打算更改其中一个副本,则只能克隆一些内容。
DateTime is a value type so everytime you assign it to a new variable you are cloning. DateTime是一个值类型,因此每次将它分配给您正在克隆的新变量时。
DateTime foo = DateTime.Now;
DateTime clone = foo;
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