比较可为空的日期时间对象 [英] Compare nullable datetime objects

问题描述

我有两个可以为空的日期时间对象，我想比较两者.最好的方法是什么?

I have two nullable datetime objects, I want to compare both. What is the best way to do it?

我已经试过了:

DateTime.Compare(birthDate, hireDate);

这给出了一个错误，也许它需要 System.DateTime 类型的日期，而我有 Nullable 日期时间.

This is giving an error, maybe it is expecting dates of type System.DateTime and I have Nullable datetimes.

我也试过了:

birthDate > hiredate...

但结果并不如预期...有什么建议吗?

But the results are not as expected...any suggestions?

推荐答案

要比较两个 Nullable<T> 对象，请使用 Nullable.Compare<T> 喜欢:

To compare two Nullable<T> objects use Nullable.Compare<T> like:

bool result = Nullable.Compare(birthDate, hireDate) > 0;

<小时>

你也可以这样做:

---

You can also do:

使用 Nullable DateTime 的 Value 属性.(记得检查两个对象是否都有一些值)

Use the Value property of the Nullable DateTime. (Remember to check if both object Has some values)

if ((birthDate.HasValue && hireDate.HasValue) 
    && DateTime.Compare(birthDate.Value, hireDate.Value) > 0)
{
}

如果两个值都相同 DateTime.Compare 将返回您 0

If both values are Same DateTime.Compare will return you 0

类似的东西

DateTime? birthDate = new DateTime(2000, 1, 1);
DateTime? hireDate = new DateTime(2013, 1, 1);
if ((birthDate.HasValue && hireDate.HasValue) 
    && DateTime.Compare(birthDate.Value, hireDate.Value) > 0)
{
}

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