gearnawer.blogg.se - Format as iformat provider

#FORMAT AS IFORMAT PROVIDER CODE#

and we'd consider File to be correct right now, and Console to be the one requiring modification.

:lj : I want to strike a balance - machine-readable as much as possible, but accept some compromises to remove clutter.

:l : I primarily want human-readable logs.

:j : I primarily want machine-readable logs.

Perhaps (unless others disagree strongly), we go the other way and just suggest people use `` or :l if they want custom/culture-aware formats? This would mean the intention is: Reading the above, I think :lj is currently the format I'd choose, while after the change, I couldn't generate this format. I think, right now, the lj format will write ISO-8601, which is almost always more convenient than culture-aware formatting (to me), but our proposed change will flip this. The only slight glitch, to me, is how DateTimes are handled.

:lj : I favor readability over anything else, and prefer to read JSON-style structured data formatting.

:l : I favor readability over anything else public static DateTime ParseExact (string s, string format, IFormatProvider provider) according to Microsoft: If format is a custom format pattern that does not include date or time separators (such as 'yyyyMMddHHmm'), use the invariant culture for the provider parameter and the widest form of each custom format specifier.

:j : I want human-readable logs, but care enough about parsing them to accept some visual noise.

: I don't want my existing log parser to break (stable formatting since pre-1.0 days).

/ /// Fallback formatter for non DateTime objects /// /// /// /// private string HandleOtherFormats( string format, object arg) Throw new FormatException( $"The format of '' is invalid ", e)

/ /// Formats an object for output /// /// optional format string, if not provided the default date pattern is used /// the object to be formatted /// format provider /// formatted string public string Format( string format, object arg, IFormatProvider formatProvider) If ( formatType = typeof( ICustomFormatter))

/ /// Gets the Formatter object /// /// format type /// formatter public object GetFormat( Type formatType) / /// date format pattern /// base format provider public CustomDateFormatter( string datePattern) angleUnit Type: Angle UnitType The unit type. formatProvider Type: System IFormatProvider The number format provider. / /// Initializes a new instance of the class. format Type: System String The format string. Initialize the FormatInfo.Format property with an object that implements the IFormatProvider interface. The formatting logic must be implemented in this method. This method takes the format string, the value and the format provider as parameters and must return the formatted string. In this example, you'll get an error on line one, and then you can clearly see that you are trying to assign a literal value (the string " 8:22:35 AM") of type string to a variable of type DateTime, which can't work.Public class CustomDateFormatter : IFormatProvider, ICustomFormatter &0183 &32 Implement the Format method of the ICustomFormatter interface. String m = n.ToString("yyyy-MM-dd'T'HH:mm:ssZ")

#FORMAT AS IFORMAT PROVIDER CODE#

Your code would look like this: DateTime n = " 8:22:35 AM" No weird stuff about IFormatProvider, which is not at all obvious. It will complain about assigning a string to a DateTime.

In this case, you'll get the error on the very first line, and it'll be obvious. If you explicitly list the types, you'll gain a greater understanding of what's going on, and the compiler will flag errors earlier. I think it might be a good idea not to use var while you're figuring out C#. Perhaps what you are trying to do is convert a string into a date first, which can be done by parsing it using DateTime's Parse or TryParse methods: var n = DateTime.Parse(" 8:22:35 AM") Since you provided an argument, the compiler assumes you meant the second version, but the types don't match. By voting up you can indicate which examples are most useful and appropriate. The type string does have a ToString() method, but that method either takes no arguments and returns the same string object, or it takes a format provider. string.Format (System.IFormatProvider, string, params object ) Here are the examples of the csharp api class string.Format (System.IFormatProvider, string, params object ) taken from open source projects. In the first one, the type of n is string. You need to understand how static typing works.