C# 新日期时间（）与默认（日期时间）
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new DateTime() vs default(DateTime)
提问by RJP
Is there a reason to choose one of these over the other?
有没有理由选择其中一个而不是另一个？
DateTime myDate = new DateTime();
or
或者
DateTime myDate = default(DateTime);
Both of them are equal 1/1/0001 12:00:00 AM.
他们俩是平等的1/1/0001 12:00:00 AM。
采纳答案by Servy
No, they are identical.
不，它们是相同的。
default(), for any value type (DateTimeis a value type) will always call the parameterless constructor.
default(), 对于任何值类型（DateTime是值类型）将始终调用无参数构造函数。
回答by Ben C
The answer is no. Keep in mind that in both cases, mdDate.Kind = DateTimeKind.Unspecified.
答案是不。请记住，在这两种情况下，mdDate.Kind = DateTimeKind.Unspecified.
Therefore it may be better to do the following:
因此，最好执行以下操作：
DateTime myDate = new DateTime(1, 1, 1, 0, 0, 0, DateTimeKind.Utc);
The myDate.Kindproperty is readonly, so it cannot be changed after the constructor is called.
该myDate.Kind属性是只读的，因此在调用构造函数后无法更改。
回答by Tomer
If you want to use default value for a DateTime parameter in a method, you can only use default(DateTime).
如果要在方法中为 DateTime 参数使用默认值，则只能使用 default(DateTime)。
The following line will not compile:
以下行不会编译：
private void MyMethod(DateTime syncedTime = DateTime.MinValue)
This line will compile:
这一行将编译：
private void MyMethod(DateTime syncedTime = default(DateTime))
回答by G.Busato
The simpliest way to understand it is that DateTime is a struct. When you initialize a struct it's initialize to it's minimum value : DateTime.Min
理解它的最简单方法是 DateTime 是一个结构体。初始化结构时，它会初始化为最小值：DateTime.Min
Therefore there is no difference between default(DateTime)and new DateTime()and DateTime.Min
因此default(DateTime)和new DateTime()和没有区别DateTime.Min
