在 asp.net 中收到阿拉伯日期时间错误 [英] Receiving an Arabic datetime error in asp.net

问题描述

I use ADO disconnected mode to get data from database by filling dataset ds. All data come true except the date field

string strDate = ds.Tables[0].Rows[0]["H_DT"].ToString();

it throws an exception says:

Specified time is not supported in this calendar. It should be between 04/30/1900 00:00:00 (Gregorian date) and 11/16/2077 23:59:59 (Gregorian date), inclusive.

I tried to write this code

System.Threading.Thread.CurrentThread.CurrentCulture = new CultureInfo("ar-sa");
System.Threading.Thread.CurrentThread.CurrentUICulture = new CultureInfo("ar-sa");

to change the culture to Arabic but without any luck.

Update

The following is screenshot of quick watch for the variable

解决方案

From DateTime.ToString method

The ToString() method returns the string representation of the date and time in the calendar used by the current culture. If the value of the current DateTime instance is earlier than Calendar.MinSupportedDateTime or later than Calendar.MaxSupportedDateTime, the method throws an ArgumentOutOfRangeException.

Your ar-sa culture's default calender is UmAlQuraCalendar calender.

var culture = CultureInfo.GetCultureInfo("ar-sa");
Console.WriteLine(culture.Calendar); // prints UmAlQuraCalendar

And from UmAlQuraCalendar.MinSupportedDateTime Property

The earliest date and time supported by the UmAlQuraCalendar class, which is equivalent to the first moment of April 30, 1900 C.E. in the Gregorian calendar.

Since your DateTime is 1, 1, 1398, it is too normal to throws ArgumentOutOfRangeException.

You can solve your problem to provide parameter an IFormatProvider in your DateTime.ToString() method which has GregorianCalendar by default. You can use InvariantCulture for example.

string strDate = ds.Tables[0].Rows[0]["H_DT"].ToString(CultureInfo.InvariantCulture);

I wrote globalization configuration in web config as ar-sa to be global in all application but I faced the same error, please clarify me, thanks

A DateTime belongs on Gregorian calendar by default. From DateTime structure;

Each DateTime member implicitly uses the Gregorian calendar to perform its operation, with the exception of constructors that specify a calendar, and methods with a parameter derived from IFormatProvider, such as System.Globalization.DateTimeFormatInfo, that implicitly specifies a calendar.

That means your ds.Tables[0].Rows[0]["H_DT"] datetime is Gregorian calender by default. But since you using .ToString() method without any parameter, your method uses your CurrentCulture which is ar-sa since you wrote it in your web.config. And that culture has UmAlQuraCalendar calender by default. Since your datetime out of range in this calender, your code throws exception.

Remember, you have a DateTime with 1318 as a year in Gregorian calender, not 1318 as a year in UmAlQuraCalendar calender.

As an example;

var date = new DateTime(1318, 1, 1);
Console.WriteLine(date.ToString(new CultureInfo("ar-sa")));

throws ArgumentOutOfRangeException exception because it is exactly the same case of yours. This is a DateTime which is a 1318 year in a Gregorian calender, but there is no representation on UmAlQuraCalendar calender of this datetime because in UmAlQuraCalendar calender, years start with 1900 in Gregorian calender.

Take a look at how UmAlQuraCalendar calender implemented;

////////////////////////////////////////////////////////////////////////////
//
//  Notes about UmAlQuraCalendar
//
////////////////////////////////////////////////////////////////////////////
 /*
 **  Calendar support range:
 **      Calendar    Minimum     Maximum
 **      ==========  ==========  ==========
 **      Gregorian   1900/04/30   2077/11/17
 **      UmAlQura    1318/01/01   1500/12/30
 */

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