解析和转换之间的区别 [英] Difference between parse and convert

问题描述

我很困惑，我们为什么要使用datetime.parse（）而不是convert.toInt32（）

请举例给我一个答案。

I am confusing, Why should we use datetime.parse() instead of convert.toInt32()
Please give me an answer with example.

推荐答案

我想说，这两种方法并没有太多共同之处。

I would say, this two methods have not much in common.

public static DateTime Parse(
    string s
)

将日期和时间的字符串表示形式转换为其DateTime等效值。



返回值

类型： System.DateTime

一个对象，相当于s中包含的日期和时间。

Converts the string representation of a date and time to its DateTime equivalent.

Return Value
Type: System.DateTime
An object that is equivalent to the date and time contained in s.

public static int ToInt32(
    string value
)

将数字的指定字符串表示形式转换为等效的32位有符号整数。



返回值

类型： System.Int32

32位有符号整数，相当于v中的数字如果值为null，则为0或0（零）。



换句话说，您使用第一种方法转换字符串，如01.May 2013 17:45 ：25到DateTime，第二个将字符串转换为-25到整数！

Converts the specified string representation of a number to an equivalent 32-bit signed integer.

Return Value
Type: System.Int32
A 32-bit signed integer that is equivalent to the number in value, or 0 (zero) if value is null.

In other words, you use the first method to convert a string like "01.May 2013 17:45:25" to DateTime and the second one to convert a string like "-25" to an integer!

du [DE]是对的，但如果你的意思是<$ c之间的区别$ c> int.Parse 和 Convert.ToInt32 ，然后看看这里：

http://stackoverflow.com/questions/199470/whats-the-main -difference-between-parse-and-convert-toint32 [ ^ ]

如果你的意思是 DateTime.Parse之间的差异和 Convert.ToDateTime ，然后看看这里：

http://stackoverflow.com/questions/8192520/any-difference-between-parse-and-convert [ ^ ]

http://forums.asp.net/t/1710269.aspx/1 [ ^ ]

http://www.pcreview.co.uk/forums/convert-todatetime-vs-system-datetime-parse- t2509851.html [ ^ ]

du[DE] is right, but if you mean the difference between int.Parse and Convert.ToInt32, then have a look here:
http://stackoverflow.com/questions/199470/whats-the-main-difference-between-int-parse-and-convert-toint32[^]
And if you mean the difference between DateTime.Parse and Convert.ToDateTime, then have a look here:
http://stackoverflow.com/questions/8192520/any-difference-between-parse-and-convert[^]
http://forums.asp.net/t/1710269.aspx/1[^]
http://www.pcreview.co.uk/forums/convert-todatetime-vs-system-datetime-parse-t2509851.html[^]

当您拥有日期或时间（或两者）的字符串表示时，您应该使用Parse方法，并且需要将其转换为DateTime对象（参见DateTime.Parse方法 [ ^ ]。

另一方面，DatetTime.IConvertible.ToInt32 [ ^ ]将朝相反的方向发展（它实际上会抛出，如文档所述）。

You should use the Parse method when you have the string representation of a date or time (or both) and need to convert it into a DateTime object (see DateTime.Parse Method[^].
On the other hand, DatetTime.IConvertible.ToInt32[^] would go in the opposite direction (it would actually throw, as stated by the documentation).

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