If we're using the ParseExact
method for exact date-time's parsing using a specified format, why do we need to provide a IFormatProvider object? what is the point behind it?
For example:
DateTime.ParseExact(dateString, format, provider);
Why do we need the provider
here?
ParseExact(String, String, IFormatProvider, DateTimeStyles) Converts the specified string representation of a date and time to its DateTime equivalent using the specified format, culture-specific format information, and style.
The IFormatProvider interface supplies an object that provides formatting information for formatting and parsing operations. Formatting operations convert the value of a type to the string representation of that value. Typical formatting methods are the ToString methods of a type, as well as Format.
why do we need to provide a IFormatProvider object? what is the point behind it?
It allows for culture-specific options. In particular:
:
or /
in your pattern, which mean culture-specific characters for the time separator or date separator respectivelyAs an example of the last point, consider the same exact string and format, interpreted in the culture of the US or Saudi Arabia:
using System;
using System.Globalization;
class Test
{
static void Main()
{
CultureInfo us = new CultureInfo("en-US");
CultureInfo sa = new CultureInfo("ar-SA");
string text = "1434-09-23T15:16";
string format = "yyyy'-'MM'-'dd'T'HH':'mm";
Console.WriteLine(DateTime.ParseExact(text, format, us));
Console.WriteLine(DateTime.ParseExact(text, format, sa));
}
}
When parsing with the US culture, the Gregorian calendar is used - whereas when parsing with the Saudi Arabian culture, the Um Al Qura calendar is used, where 1434 is the year we're currently in (as I write this answer).
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