51Degrees Device Detection .NET  4.2

Device detection services for 51Degrees Pipeline


This example shows how to retrieve property meta data from 51Degrees on-premise device detection. This feature can be used to get information such as the category that a property belongs to or the possible values a property can have. (As of the current data file. If the data file is updated, the possible values for a property can change)

This example is available in full on GitHub.

This example requires a local data file. Free data files can be acquired by pulling the submodules under this repository or from the device-detection-data GitHub repository.

Required NuGet Dependencies:

/* *********************************************************************
* This Original Work is copyright of 51 Degrees Mobile Experts Limited.
* Copyright 2019 51 Degrees Mobile Experts Limited, 5 Charlotte Close,
* Caversham, Reading, Berkshire, United Kingdom RG4 7BY.
* This Original Work is licensed under the European Union Public Licence (EUPL)
* v.1.2 and is subject to its terms as set out below.
* If a copy of the EUPL was not distributed with this file, You can obtain
* one at https://opensource.org/licenses/EUPL-1.2.
* The 'Compatible Licences' set out in the Appendix to the EUPL (as may be
* amended by the European Commission) shall be deemed incompatible for
* the purposes of the Work and the provisions of the compatibility
* clause in Article 5 of the EUPL shall not apply.
* If using the Work as, or as part of, a network application, by
* including the attribution notice(s) required under Article 5 of the EUPL
* in the end user terms of the application under an appropriate heading,
* such notice(s) shall fulfill the requirements of that article.
* ********************************************************************* */
using FiftyOne.Pipeline.Engines;
using Microsoft.Extensions.Logging;
using System;
using System.IO;
using System.Linq;
using System.Text;
public class Program
public class Example : ExampleBase
// Truncate value if it contains newline (esp for the JavaScript property)
private string TruncateToNl(string s)
var lines = s.Split(new char[] { '\n' }, StringSplitOptions.RemoveEmptyEntries);
var result = lines.FirstOrDefault();
if (lines.Length > 1)
result += " ...";
return result;
public void Run(string dataFile, bool test = false)
FileInfo f = new FileInfo(dataFile);
Console.WriteLine($"Using data file at '{f.FullName}'");
Console.WriteLine($"This example will use the meta-data exposed " +
$"by the device detection engine to display the names and " +
$"details of all the properties it can populate.");
// Give the user time to to read previous message as this
// example prints a lot of information to the console. Skip if
// run by a unit test.
if (test == false)
Console.WriteLine($"Press any key to continue.");
// Build a new on-premise Hash engine with the low memory performance profile.
using (var ddEngine = new DeviceDetectionHashEngineBuilder(
new LoggerFactory())
// Prefer low memory profile where all data streamed
// from disk on-demand. Experiment with other profiles.
// Finally build the engine.
.Build(dataFile, false))
// Iterate over all properties in the data file, printing the name, value type,
// and description for each one.
foreach (var property in ddEngine.Properties)
// Output some details about the property.
// Add some formatting to highlight property names.
Console.ForegroundColor = ConsoleColor.White;
Console.BackgroundColor = ConsoleColor.DarkRed;
Console.ForegroundColor = ConsoleColor.Gray;
Console.BackgroundColor = ConsoleColor.Black;
Console.WriteLine($"[Category: {property.Category}]" +
$"({property.Type.Name}) - {property.Description}");
// Next, output a list of the possible values this
// property can have.
// Most properties in the Device Metrics category do
// not have defined values so exclude them.
if (property.Category != "Device Metrics")
StringBuilder values = new StringBuilder("Possible values: ");
foreach (var value in property.Values.Take(20))
// add value
// add description if exists
if (string.IsNullOrEmpty(value.Description) == false)
if (property.Values.Count() > 20)
values.Append($" + {property.Values.Count() - 20} more ...");
static void Main(string[] args)
var defaultDataFile = "..\\..\\..\\..\\..\\..\\..\\..\\device-detection-cxx\\device-detection-data\\51Degrees-LiteV4.1.hash";
var defaultDataFile = "..\\..\\..\\..\\..\\..\\..\\device-detection-cxx\\device-detection-data\\51Degrees-LiteV4.1.hash";
var dataFile = args.Length > 0 ? args[0] : defaultDataFile;
new Example().Run(dataFile);
#if (DEBUG)
Console.WriteLine("Complete. Press key to exit.");