blocks|key|3276970|text|使用DateTime.ParseExact。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3276971|this.Text="22/11/2009";

DateTime+date+=+DateTime.ParseExact(this.Text,+"dd/MM/yyyy",+null);|code-block|syntax|javascript|3276972|entityMap^0|2|J|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

Use <code>DateTime.ParseExact</code>.

<pre><code>this.Text="22/11/2009";

DateTime date = DateTime.ParseExact(this.Text, "dd/MM/yyyy", null);
</code></pre>

blocks|key|318383|text|您需要调用ParseExact，它会解析与您提供的格式完全匹配的日期。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|318384|例如：|318385|DateTime+date+=+DateTime.ParseExact(this.Text,+"dd/MM/yyyy",+CultureInfo.InvariantCulture);|code-block|syntax|javascript|318386|IFormatProvider参数指定用于分析日期的区域性。|318387|除非字符串来自用户，否则应该传递CultureInfo.InvariantCulture。|318388|如果字符串确实来自用户，则应传递CultureInfo.CurrentCulture，它将使用用户在“控制面板”的“区域选项”中指定的设置。|318389|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/w2sa9yss.aspx^0|5|A|5|A|0|0|0|0|0|F|0|G|S|0|G|Q|0^^$0|@$1|2|3|4|5|6|7|10|8|@$9|11|A|12|B|C]]|D|@$9|13|A|14|1|15]]|E|$]]|$1|F|3|G|5|6|7|16|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|17|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|18|8|@$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|O|3|P|5|6|7|1B|8|@$9|1C|A|1D|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|6|7|1E|8|@$9|1F|A|1G|B|C]]|D|@]|E|$]]|$1|S|3|-4|5|6|7|1H|8|@]|D|@]|E|$]]]|T|$U|$5|V|W|X|E|$Y|Z]]]]

You need to call <a href="http://msdn.microsoft.com/en-us/library/w2sa9yss.aspx" rel="noreferrer"><code>ParseExact</code></a>, which parses a date that exactly matches a format that you supply.

For example:

<pre><code>DateTime date = DateTime.ParseExact(this.Text, "dd/MM/yyyy", CultureInfo.InvariantCulture);
</code></pre>

The <code>IFormatProvider</code> parameter specifies the culture to use to parse the date. 
Unless your string comes from the user, you should pass <code>CultureInfo.InvariantCulture</code>. 
If the string does come from the user, you should pass <code>CultureInfo.CurrentCulture</code>, which will use the settings that the user specified in Regional Options in Control Panel.

blocks|key|320228|text|解析DateTime的字符串表示是一件棘手的事情，因为不同的区域性具有不同的日期格式。.Net知道这些日期格式，并在您调用DateTime.Parse(this.Text)时从当前区域性(System.Threading.Thread.CurrentThread.CurrentCulture.DateTimeFormat)中提取它们；|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|320229|例如，字符串"22/11/2009“与美国(en-US)的ShortDatePattern不匹配，但与法国(fr-FR)匹配。|320230|现在，您可以调用DateTime.ParseExact并传入所需的确切格式字符串，也可以将适当的区域性传递给DateTime.Parse以解析日期。|320231|例如，这将正确解析您的日期：|320232|DateTime.Parse(+"22/11/2009",+CultureInfo.CreateSpecificCulture("fr-FR")+);|code-block|syntax|javascript|320233|当然，你不应该随意选择法国，而应该选择适合你需要的。|320234|您需要弄清楚的是System.Threading.Thread.CurrentThread.CurrentCulture设置为什么，以及它是否/为什么与您预期的不同。|320235|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/system.globalization.datetimeformatinfo.shortdatepattern.aspx^0|1P|P|2M|1V|0|T|G|0|0|8|J|1I|E|0|0|0|0|8|1G|0^^$0|@$1|2|3|4|5|6|7|12|8|@$9|13|A|14|B|C]|$9|15|A|16|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|17|8|@]|D|@$9|18|A|19|1|1A]]|E|$]]|$1|H|3|I|5|6|7|1B|8|@$9|1C|A|1D|B|C]|$9|1E|A|1F|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|1G|8|@]|D|@]|E|$]]|$1|L|3|M|5|N|7|1H|8|@]|D|@]|E|$O|P]]|$1|Q|3|R|5|6|7|1I|8|@]|D|@]|E|$]]|$1|S|3|T|5|6|7|1J|8|@$9|1K|A|1L|B|C]]|D|@]|E|$]]|$1|U|3|-4|5|6|7|1M|8|@]|D|@]|E|$]]]|V|$W|$5|X|Y|Z|E|$10|11]]]]

Parsing a string representation of a DateTime is a tricky thing because different cultures have different date formats. .Net is aware of these date formats and pulls them from your current culture (<code>System.Threading.Thread.CurrentThread.CurrentCulture.DateTimeFormat</code>) when you call <code>DateTime.Parse(this.Text)</code>;

For example, the string "22/11/2009" does not match the <a href="http://msdn.microsoft.com/en-us/library/system.globalization.datetimeformatinfo.shortdatepattern.aspx" rel="noreferrer">ShortDatePattern</a> for the United States (en-US) but it does match for France (fr-FR).

Now, you can either call <code>DateTime.ParseExact</code> and pass in the exact format string that you're expecting, or you can pass in an appropriate culture to <code>DateTime.Parse</code> to parse the date.

For example, this will parse your date correctly:

<pre><code>DateTime.Parse( "22/11/2009", CultureInfo.CreateSpecificCulture("fr-FR") );
</code></pre>

Of course, you shouldn't just randomly pick France, but something appropriate to your needs.

What you need to figure out is what <code>System.Threading.Thread.CurrentThread.CurrentCulture</code> is set to, and if/why it differs from what you expect.

blocks|key|317450|text|您可能需要指定该特定日期格式的区域性，如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|317451|++++Thread.CurrentThread.CurrentCulture+=+new+CultureInfo("en-GB");+//dd/MM/yyyy

++++this.Text="22/11/2009";

++++DateTime+date+=+DateTime.Parse(this.Text);|code-block|syntax|javascript|317452|有关更多详细信息，请访问此处：|317453|http://msdn.microsoft.com/en-us/library/5hh873ya.aspx|offset|length|317454|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|0|1H|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|U|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|V|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|W|8|@]|9|@$K|X|L|Y|1|Z]]|A|$]]|$1|M|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|J]]]]

You might need to specify the culture for that specific date format as in:

<pre><code> Thread.CurrentThread.CurrentCulture = new CultureInfo("en-GB"); //dd/MM/yyyy

 this.Text="22/11/2009";

 DateTime date = DateTime.Parse(this.Text);
</code></pre>

For more details go here:

<a href="http://msdn.microsoft.com/en-us/library/5hh873ya.aspx" rel="noreferrer">http://msdn.microsoft.com/en-us/library/5hh873ya.aspx</a>

blocks|key|3277052|text|使用此命令将字符串转换为日期时间：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3277053|Datetime+DT+=+DateTime.ParseExact(STRDATE,"dd/MM/yyyy",System.Globalization.CultureInfo.CurrentUICulture.DateTimeFormat)|code-block|syntax|javascript|3277054|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

use this to convert string to datetime:

<pre><code>Datetime DT = DateTime.ParseExact(STRDATE,"dd/MM/yyyy",System.Globalization.CultureInfo.CurrentUICulture.DateTimeFormat)
</code></pre>

blocks|key|315427|text|您还可以使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|315428|this.Text+=+"22112009";
DateTime+newDateTime+=+new+DateTime(Convert.ToInt32(this.Text.Substring(4,+4)),+//+Year
++++++++++++++++++++++++++++++++++++Convert.ToInt32(this.Text.Substring(2,2)),+//+Month
++++++++++++++++++++++++++++++++++++Convert.ToInt32(this.Text.Substring(0,2)));//+Day|code-block|syntax|javascript|315429|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can use also

<pre><code>this.Text = "22112009";
DateTime newDateTime = new DateTime(Convert.ToInt32(this.Text.Substring(4, 4)), // Year
 Convert.ToInt32(this.Text.Substring(2,2)), // Month
 Convert.ToInt32(this.Text.Substring(0,2)));// Day
</code></pre>

blocks|key|315440|text|虽然上述解决方案是有效的，但您也可以使用以下内容修改webconfig文件...|type|unstyled|depth|inlineStyleRanges|entityRanges|data|315441|<configuration>
+++<system.web>
+++++<globalization+culture="en-GB"/>
+++</system.web>
</configuration>|code-block|syntax|javascript|315442|参考：Datetime+format+different+on+local+machine+compared+to+production+machine|offset|length|315443|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/3768061/datetime-format-different-on-local-machine-compared-to-production-machine^0|0|0|3|21|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

Although the above solutions are effective, you can also modify the webconfig file with the following...

<pre><code>&lt;configuration&gt;
 &lt;system.web&gt;
 &lt;globalization culture="en-GB"/&gt;
 &lt;/system.web&gt;
&lt;/configuration&gt;
</code></pre>

Ref : <a href="https://stackoverflow.com/questions/3768061/datetime-format-different-on-local-machine-compared-to-production-machine">Datetime format different on local machine compared to production machine</a>

blocks|key|315456|text|就像上面有人说的，你可以将它作为字符串参数发送，但它必须是这样的格式:例如，'20130121‘，你可以将它转换为该格式，直接从控件获取它。例如，你可以从一个文本框中得到它：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|315457|date+=+datetextbox.text;+//+date+is+going+to+be+something+like:+"2013-01-21+12:00:00am"|code-block|syntax|javascript|315458|要将其转换为：'20130121‘，您可以使用：|315459|date+=+date.Substring(6,+4)+%2B+date.Substring(3,+2)+%2B+date.Substring(0,+2);|315460|以便SQL可以对其进行转换并将其放入数据库。|315461|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Just like someone above said you can send it as a string parameter but it must have this format: '20130121' for example and you can convert it to that format taking it directly from the control. So you'll get it for example from a textbox like:

<pre><code>date = datetextbox.text; // date is going to be something like: "2013-01-21 12:00:00am"
</code></pre>

to convert it to: '20130121' you use:

<pre><code>date = date.Substring(6, 4) + date.Substring(3, 2) + date.Substring(0, 2);
</code></pre>

so that SQL can convert it and put it into your database.

blocks|key|3064113|text|private+DateTime+ConvertToDateTime(string+strDateTime)
{
DateTime+dtFinaldate;+string+sDateTime;
try+{+dtFinaldate+=+Convert.ToDateTime(strDateTime);+}
catch+(Exception+e)
{
string[]+sDate+=+strDateTime.Split('/');
sDateTime+=+sDate[1]+%2B+'/'+%2B+sDate[0]+%2B+'/'+%2B+sDate[2];
dtFinaldate+=+Convert.ToDateTime(sDateTime);
}
return+dtFinaldate;
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|3064114|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>private DateTime ConvertToDateTime(string strDateTime)
{
DateTime dtFinaldate; string sDateTime;
try { dtFinaldate = Convert.ToDateTime(strDateTime); }
catch (Exception e)
{
string[] sDate = strDateTime.Split('/');
sDateTime = sDate[1] + '/' + sDate[0] + '/' + sDate[2];
dtFinaldate = Convert.ToDateTime(sDateTime);
}
return dtFinaldate;
}
</code></pre>

blocks|key|3277122|text|在花了很多时间之后，我解决了这个问题|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3277123|+string+strDate+=+PreocessDate(data);
+string[]+dateString+=+strDate.Split('/');
+DateTime+enter_date+=+Convert.ToDateTime(dateString[1]%2B"/"%2BdateString[0]%2B"/"%2BdateString[2]);|code-block|syntax|javascript|3277124|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

After spending lot of time I have solved the problem

<pre><code> string strDate = PreocessDate(data);
 string[] dateString = strDate.Split('/');
 DateTime enter_date = Convert.ToDateTime(dateString[1]+"/"+dateString[0]+"/"+dateString[2]);
</code></pre>

blocks|key|3277147|text|手动更改：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3277148|string+s+=+date.Substring(3,+2)+%2B"/"+%2B+date.Substring(0,+2)+%2B+"/"+%2B+date.Substring(6,+4);|code-block|syntax|javascript|3277149|从2015年11月22日起，将于2015年11月11日进行转换|3277150|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Change Manually : 

<pre><code>string s = date.Substring(3, 2) +"/" + date.Substring(0, 2) + "/" + date.Substring(6, 4);
</code></pre>

From 11/22/2015 it will be converted in 22/11/2015

blocks|key|317524|text|在下面的代码中，为我工作：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|317525|DateTime+date+=+DateTime.Parse(this.Text,+CultureInfo.CreateSpecificCulture("fr-FR"));|code-block|syntax|javascript|317526|命名空间|317527|using+System.Globalization;|317528|entityMap^0|8|5|0|0|0|4|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|P|$]]

Worked for me below code:

<pre><code>DateTime date = DateTime.Parse(this.Text, CultureInfo.CreateSpecificCulture("fr-FR"));
</code></pre>

Namespace

<pre><code>using System.Globalization;
</code></pre>

blocks|key|3277209|text|在this+reference的基础上，下一种方法对我有效：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3277210|//+e.g.+format+=+"dd/MM/yyyy",+dateString+=+"10/07/2017"+
var+formatInfo+=+new+DateTimeFormatInfo()
{
+++++ShortDatePattern+=+format
};
date+=+Convert.ToDateTime(dateString,+formatInfo);|code-block|syntax|javascript|3277211|entityMap|0|LINK|mutability|MUTABLE|url|https://www.experts-exchange.com/questions/28520318/String-was-not-recognized-as-a-valid-DateTime.html^0|1|E|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

Based on <a href="https://www.experts-exchange.com/questions/28520318/String-was-not-recognized-as-a-valid-DateTime.html" rel="noreferrer">this reference</a>, the next approach worked for me:

<pre><code>// e.g. format = "dd/MM/yyyy", dateString = "10/07/2017" 
var formatInfo = new DateTimeFormatInfo()
{
 ShortDatePattern = format
};
date = Convert.ToDateTime(dateString, formatInfo);
</code></pre>

I am trying to convert my string formatted value to date type with format <code>dd/MM/yyyy</code>.

<pre><code>this.Text="22/11/2009";

DateTime date = DateTime.Parse(this.Text);
</code></pre>

What is the problem ?
It has a second override which asks for <code>IFormatProvider</code>. What is this? Do I need to pass this also? If Yes how to use it for this case?

Edit 

What are the differences between <code>Parse</code> and <code>ParseExact</code>?

Edit 2

Both answers of Slaks and Sam are working for me, currently user is giving the input but this will be assured by me that they are valid by using maskTextbox.

Which answer is better considering all aspects like type saftey, performance or something you feel like

String was not recognized as a valid DateTime " format dd/MM/yyyy"

数据库

我正在尝试将字符串格式值转换为dd/MM/yyyy格式的date类型。this.Text="22/11/2009";DateTime date = DateTime.Parse(this.Text);问题出在哪里？它有一个要求IFormatProvider的第二个覆盖。这是什么？我也需要通过这个吗？如果是，在这种情况下...

问字符串未识别为有效的DateTime“格式dd/MM/yyyy”
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问字符串未识别为有效的DateTime“格式dd/MM/yyyy”
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