Currently there's only one utility in the library, IdentificationNumber, which lets you parse, validate and generate Norwegian National Identity Numbers. More utilities are coming!
The library targets .NET Standard 2.0 and .NET 5, which means it's supported on pretty much any .NET platform still supported by Microsoft.
The library supports parsing fødselsnummer, D-nummer and H-nummer. This is done through the various overloads of IdentificationNumber.Parse and IdentificationNumber.TryParse.
There's also a few overloads of IsValid to validate that a string is a valid identification number (of a specified type).
Additionally, there are convenience methods for parsing out date of birth (using TryParseDateOfBirth) and gender (using TryParseGender) directly.
Parsing is built on modern APIs such as ReadOnlySpan<T>, which makes it really fast and completely allocation free. See benchmarks below.
The results of the IsValidIdentificationNumberBenchmark on .NET 10:
| Method | Mean | Error | StdDev | Ratio | RatioSD | Gen0 | Allocated | Alloc Ratio |
|---|---|---|---|---|---|---|---|---|
| Redskap | 16.88 ns | 0.069 ns | 0.061 ns | 1.00 | 0.00 | - | - | NA |
| Nonin | 77.54 ns | 1.115 ns | 0.989 ns | 4.59 | 0.06 | 0.0370 | 232 B | NA |
| NoCommons | 143.06 ns | 2.581 ns | 2.288 ns | 8.48 | 0.14 | 0.0484 | 304 B | NA |
| Tedd | 893.48 ns | 14.738 ns | 13.786 ns | 52.90 | 0.86 | 0.3633 | 2280 B | NA |
| NinEngine | 264.39 ns | 3.212 ns | 2.847 ns | 15.66 | 0.18 | 0.0200 | 128 B | NA |
The library also supports generating valid fødselsnummer, D-nummer and H-nummer.
This is done through the various overloads of IdentificationNumber.Generate. These let you specify kind, gender, date of birth and/or a min- and max date.
If you want to control the randomness of the generation, e.g. for unit testing, you can create your own instance of IdentificationNumber.Generator and pass in your own (seeded) Random instance. See this unit test as an example.
The results of the GenerateIdentificationNumberBenchmark on .NET 10:
| Method | Mean | Error | StdDev | Ratio | RatioSD | Gen0 | Gen1 | Allocated | Alloc Ratio |
|---|---|---|---|---|---|---|---|---|---|
| Redskap | 85.93 ns | 0.449 ns | 0.375 ns | 1.00 | 0.00 | - | - | - | NA |
| NoCommons | 630,182.62 ns | 9,721.718 ns | 8,118.075 ns | 7,334.22 | 98.93 | 85.9375 | 8.7891 | 541961 B | NA |
| NinEngine | NA | NA | NA | ? | ? | NA | NA | NA | ? |
Entity Framework Extensions and Dapper Plus are major sponsors and proud to contribute to the development of Redskap.
