BrowscapNET is a .NET Standard 2.0 library that detects browser capabilities such as browser name, version and platform based on a supplied user agent string. It has a fast implementation of browser capbilities detection using full_asp_browscap.ini from browscap.org. Searching a database of 150,000 user agent patterns from full_asp_browscap.ini takes ~5ms on Macbook Pro 2017 per query uncached.
This library was primarily developed to quickly parse user agents from log files. Existing user agent parser solutions were either unreliable, didn't provide enough details, or used regular expressions that would take up to 1 second to return a result. This solution doesn't use regular expressions. Instead it constructs a pattern tree from all the patterns, allowing it to quickly seek a matching pattern with the help of a hash table.
As the initial use case was bulk log parsing, initialisation time and memory usage was sacificed for runtime performance. However, these could be further optimised in the future.
A copy of full_asp_browscap.ini from browscap.org needs to be loaded into BrowserCapabilitiesService via the LoadBrowscap method. After loading the data, you can call Find to get BrowserCapabilityInfo. See BrowserCapabilityInfo.cs for the full list of capabilities.
It is recommended that you cache the results of Find for better performance.
BrowserCapabilitiesService browserCapabilitiesService = new BrowserCapabilitiesService();
browserCapabilitiesService.LoadBrowscap("full_asp_browscap.ini");
var info = browserCapabilitiesService.Find("Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:59.0) Gecko/20100101 Firefox/59.0");
Console.WriteLine(info.Browser); // Firefox
Console.WriteLine(info.Version); // 59See the BrowserCapabilityInfo class for a full list of capabilties.