Whether via String‘s constructors, or StringBuilder, or ToString overrides, or helper methods on String.
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NET Framework 1.0 was released, and more have joined the fray since. NET, that means lots and lots of creation is so fundamental that a myriad of ways of creating them have existed since. This is purely my humble opinion and others may think of it differently. &0183 &32 Text processing is at the heart of huge numbers of apps and services, and in. Format providers supply information such as the character to use as the decimal point when formatting numeric strings, or the separation character to use when formatting a DateTime object. In this case, we are differing the algorithm for displaying a “secure” SSN based on context. The Format property refers to the format provider which contains information on how values should be formatted according to the FormatInfo.FormatString pattern by the FormatInfo.GetDisplayText function. Where ssnFormatProvider is declared as IFormatProvider and could be anyone of the concrete classes mentioned above based on the role of the person logged in. Now we can specify we want the SSN without dashes simply as:Ĭonsole.WriteLine( string. Return formatter.Format(format, this, formatProvider) Ĭase “ nd “ : return _rawNumber.Replace( “ – “, “” ) ICustomFormatter formatter = formatProvider.GetFormat( Public string ToString( string format, IFormatProvider formatProvider) We can implement the interface like this: Public class SocialSecurityNumber : IFormattable NET Framework offers an IFormattable Interface that closes the class for modification ( at least with formatting ) but opens it up for extension by allowing clients to inject their own ICustomFormatter to format the SSN as they wish: ToString(String, IFormatProvider) method returns A string representation of value.
#Format as iformat provider code
“Closed For Modification” – Extending the behavior of the class does not result in the changing of the source code or binary code of the class itself. To format Python Datetime strptime and stftime functions can be used.
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#Format as iformat provider software
“Software entities (classes, modules, functions, etc.) should be open for extension, but closed for modification ” – Agile Software Development Principles, Patterns, and PracticesĬlasses that adhere to the Open-Closed Principle have 2 primary attributes: This would mainly be a pain in the butt, but it also “violates” the Open-Closed Principle:
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You can see a problem we might have in the future. We really don’t want to keep adding new methods on this class as people need new formatting options. One particular method, GetWithoutDashes, which returns the Social Security Number without dashes, suggests that clients of this class may want to format the SSN in multiple ways: Assuming we keep it as a reference object ( class ), I would probably make the following changes: This sounds like a great plot for a Code Room Episode. Some would probably suggest it be a struct and others would modify or change the class completely. Use some intelligence to compare for sameness.Īs I looked at it, my thoughts were that if you stuck 10 developers in a room to finish the template, each of them would probably come up with a different solution. Return true // or false if they don’t match. Public SocialSecurityNumber( string number) The class is really a template that leaves things rather wide open, but it served his discussion nicely and didn’t need to be built-up futher. 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).Jeffrey provided an example of a SocialSecurityNumber Class in his recent post, called EVERY application has a natural domain model – level 200.
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String format = "yyyy'-'MM'-'dd'T'HH':'mm" Ĭonsole.WriteLine(DateTime.ParseExact(text, format, us)) Ĭonsole.WriteLine(DateTime.ParseExact(text, format, sa)) The culture determines the default calendar as well, which will affect the resultĪs 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 ĬultureInfo us = new CultureInfo("en-US") ĬultureInfo sa = new CultureInfo("ar-SA").When parsing month and day names, those clearly depend on culture.You could use : or / in your pattern, which mean culture-specific characters for the time separator or date separator respectively.The format you use could be a standard date/time format, which means different patterns in different cultures.Why do we need to provide a IFormatProvider object? what is the point behind it?