日期代码和字符串反向 [英] date code and string reverse
问题描述
我需要将日期反转以显示为日期代码。例如今天
，090507将被编码为905070（扭转部分日期。
这就是我所拥有的但是必须有一个更好的方式。
DateTime d = DateTime.Now;
string datecodemonth = d.ToString（" MM"）;
datecodemonth = datecodemonth [1] + datecodemonth [0];
string datecodeday = d.ToString（" dd"）;
datecodeday = datecodeday [1] + datecodeday [ 0];
string datecodeyear = d.ToString（" yy"）;
datecodeyear = datecodeyear [1] + datecodeyear [0];
string datecode = datecodemonth + datecodeday + datecodeyear;
想法？日期格式有什么可以做到的吗？
dan
I have a need to reverse a date to show as a "date code". For example
today, 090507 would be coded as 905070 (reversing the parts of the date.
This is what i have but there has to be a better way.
DateTime d = DateTime.Now;
string datecodemonth = d.ToString("MM");
datecodemonth = datecodemonth[1] + datecodemonth[0];
string datecodeday = d.ToString("dd");
datecodeday = datecodeday[1] + datecodeday[0];
string datecodeyear = d.ToString("yy");
datecodeyear = datecodeyear[1] + datecodeyear[0];
string datecode = datecodemonth + datecodeday + datecodeyear;
Ideas? Is there anything in the format of the date that will do this?
dan
推荐答案
似乎想要做一件非常奇怪的事情，但为什么不呢?-p
如果这是高音量，然后避免大量的中间字符串，
尝试在char []缓冲区中工作，有些比如：
static void Main（string [] args）{
char [] buffer =
DateTime.Today。 ToString（" MMddyy"）。ToCharArray（）;
交换（缓冲区，0,1）; //也许展开...
交换（缓冲区，2,3）;
交换（缓冲区，4,5）;
string s = new string（buffer）;
Debug.WriteLine（s）;
}
static void Swap（char [] data，int index1，int index2）{
char c = data [index1];
data [index1] = data [index2];
data [ index2] = c;
}
Seems a very odd thing to want to do, but why not ;-p
If this is high volume, then to avoid lots of intermediate strings,
try to work in a char[] buffer, something like:
static void Main(string[] args) {
char[] buffer =
DateTime.Today.ToString("MMddyy").ToCharArray();
Swap(buffer, 0, 1); // perhaps unroll...
Swap(buffer, 2, 3);
Swap(buffer, 4, 5);
string s = new string(buffer);
Debug.WriteLine(s);
}
static void Swap(char[] data, int index1, int index2) {
char c = data[index1];
data[index1] = data[index2];
data[index2] = c;
}
" Dan Holmes" < da ******* @ bigfoot.comwrote in message
news：OU ************* @ TK2MSFTNGP06.phx.gbl ...
"Dan Holmes" <da*******@bigfoot.comwrote in message
news:OU*************@TK2MSFTNGP06.phx.gbl...
想法？是否有日期格式的任何内容？
Ideas? Is there anything in the format of the date that will do this?
首先，创建一个函数来反转字符串：
string StringReverse（string pstrString）
{
char [] strArray = pstrString.ToCharArray（）;
Array.Reverse（strArray）;
返回新字符串（strArray ）;
}
然后执行以下操作：
string strDateLiteral =" 090507";
DateTime dtmDate = DateTime.ParseExact（strDateLiteral，" MMddyy"，null）;
string strDateReversed =
StringReverse（dtmDate.ToString（" MM"））+
StringReverse（dtmDate.ToString（" dd"））+
StringReverse（dtmDate.ToString（" yy"））;
-
Mark Rae
ASP.NET MVP
http://www.markrae.net
Firstly, create a function to reverse a string:
string StringReverse(string pstrString)
{
char[] strArray = pstrString.ToCharArray();
Array.Reverse(strArray);
return new string(strArray);
}
Then do the following:
string strDateLiteral = "090507";
DateTime dtmDate = DateTime.ParseExact(strDateLiteral, "MMddyy", null);
string strDateReversed =
StringReverse(dtmDate.ToString("MM")) +
StringReverse(dtmDate.ToString("dd")) +
StringReverse(dtmDate.ToString("yy"));
--
Mark Rae
ASP.NET MVP
http://www.markrae.net
开9月5日晚上11点39分，Dan Holmes< danhol ... @ bigfoot.comwrote：
On Sep 5, 11:39 pm, Dan Holmes <danhol...@bigfoot.comwrote:
我需要将日期反转以显示为日期代码。例如今天
，090507将编码为905070（扭转日期部分。
I have a need to reverse a date to show as a "date code". For example
today, 090507 would be coded as 905070 (reversing the parts of the date.
Mark'和Marc'示例使用默认的DateTime字符串格式
提供程序，然后操纵其结果。更多.NET-ty解决方案
可能是实现自定义格式提供程序，并且使用它从DateTime而不是默认提供者创建
a字符串。这将是
避免首先转到090507然后转到905070，直接转到
$来自DateTime实例的b $ b 905070。有关如何实现自定义格式提供程序的示例，请参阅此处： http://www.codeproject.com/csharp/custstrformat.asp
Both Mark''s and Marc''s examples use the default DateTime string format
provider, and then manipulates its results. A more .NET-ty solution
might be to implement a custom format provider, and use that to create
a string from a DateTime instead of the default provider. This would
avoid first going to 090507 and then to 905070, going directly to
905070 from a DateTime instance. See here for an example on how to
implement a custom format provider: http://www.codeproject.com/csharp/custstrformat.asp
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