比较C#中的日期 [英] comparing dates in C#

问题描述

我该如何比较C#中的日期.范例d1 = 2012年2月1日，d2 = 2012年1月1日

如果没有错误提示，则条件d2必须大于d1

我该怎么办?

在此先感谢

how do i compare dates in C#. example d1 = february 1, 2012, d2 = january 1, 2012

condition d2 must be greater than d1 if not an error prompt occur

how do i do this?

thanks in advance

推荐答案

这只是一个简单的示例，我建议您使用TryParse而不是parse，但是该示例足以说明要做什么:

This is only a simple example and I advise you to use TryParse instead of parse, but the example is sufficient to illustrate what to do:

static void Main()
{
    DateTime d1 = DateTime.Parse("February 1, 2012"); // Better to use TryParse here
    DateTime d2 = DateTime.Parse("January  1, 2012"); // ditto

    if (DateTime.Compare(d1, d2) < 0) // also possible to use d1.CompareTo(d2). If the result is less than zero d1 is less than d2
    //if (d1 < d2) // As Youssef pointed out the normal relational less than or greater than operator can also be used
    {
        Console.WriteLine("Everything OK!");
    }
    else
    {
        Console.WriteLine("Do what ever you see fit in the error case!");
    }
}

这很简单，很正常，我的朋友:

It is easy and normal, my friend:

if(d1 < d2)
{
    // Code in case of correct date relation
}
else
{
    // Code in case of error (d2 less than or equal to d1)
}

使用TimeSpan Compare ^ ].

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