OpenTDB-Wrapper

An async C# wrapper for the Open Trivia DB API.

Add to Project

Via dotnet:

dotnet add package OpenTDB-Wrapper --version 1.9.1

Via PackageReference in your .csproj file:

<PackageReference Include="OpenTDB-Wrapper" Version="1.9.1" />

Usage

Setup

As a good rule of thumb, add these using statements.

using OpenTDB; // For fetching questions from the API
using OpenTDB.Enumerators; // For specifying optional paramters
using OpenTDB.Exceptions; // For handling OpenTDB exceptions
using OpenTDB.Models; // For interacting with the Question class

Create an instance of OpenTDB.

OpenTDB.OpenTDB openTDB = new();

If you want to pass in your own HttpClient you can do it like so:

HttpClient httpClient = new();

OpenTDB.OpenTDB openTDB = new(httpClient);

Using Tokens

Warning

It is highly recommended that you call InitializeTokenAsync() immediately after creation of the OpenTDB object if you call it at all.

The Open Trivia Database API provides session tokens for ensuring no duplicate questions are retrieved. You can start usage of a token like so:

await openTDB.InitializeTokenAsync();
// Initializes the session Token.

After one of the following happens you will need to call ResetTokenAsync(), this will get a new session token:

• After 6 hours your session token is automatically deleted by Open Trivia Database.
• If you ever exhaust all questions in the database.

You will know for certain that you should call this method if you get one of the following exceptions, these indicate your session token is dead:

• Code 3: Token Not Found | Session Token does not exist.
• Code 4: Token Empty | Session Token has returned all possible questions for the specified query. Resetting the Token is necessary.

await openTDB.ResetTokenAsync();
// Sets the Token to a newly created one.

Getting Questions

Warning

GetQuestionsAsync() should be wrapped in a try-catch block as it throws OpenTDBException and ArguementException.

Warning

GetQuestionsAsync(), should not be called less-than 5 seconds apart due to Open Trivia DB' rate limits.

Use GetQuestionsAsync() to get a list of questions. This method has default values of Category.Any, Difficulty.Any, and QuestionType.Any.

await openTDB.GetQuestionsAsync(10);
// returns a List<Question> with a Count of 10.

Here is a more complicated example. If you wanted to get 10 Nature questions, that were of easy difficulty, and in the form of multiple-choice questions, it would look like so:

await openTDB.GetQuestionsAsync(10, Category.Nature, Difficulty.Easy, QuestionType.MultipleChoice);
// returns a List<Question> with a Count of 10.

Important

All values in the Question class will be encoded in whatever you specified when calling GetQuestionsWithEncodingAsync(). You must handle parsing of this data.

Here is a more complicated example. If you wanted to get 10 Nature questions, that were of easy difficulty, in the form of a multiple-choice questions, and had legacy URL encoding it would look like so:

await openTDB.GetQuestionsWithEncodingAsync(10, Category.Nature, Difficulty.Easy, QuestionType.MultipleChoice, Encoding.LegacyURL);
// returns a List<Question> with a Count of 10.

Question Categories

The Category enumerator contains all valid opetions for the "category" value of the API.

Value	Description	URL Request Category Value
Any	Any category	-
GeneralKnowledge	General Knowledge	9
Books	Books	10
Film	Film	11
Music	Music	12
MusicalsTheatres	Musicals & Theatres	13
Television	Television	14
VideoGames	Video Games	15
BoardGames	Board Games	16
Nature	Nature	17
Computers	Computers	18
Mathematics	Mathematics	19
Mythology	Mythology	20
Sports	Sports	21
Geography	Geography	22
History	History	23
Politics	Politics	24
Art	Art	25
Celebrities	Celebrities	26
Animals	Animals	27
Vehicles	Vehicles	28
Comics	Comics	29
Gadgets	Gadgets	30
AnimeManga	Anime & Manga	31
CartoonsAnimations	Cartoons & Animations	32

Question Difficulty

The Difficulty enumerator contains all valid options for the "difficulty" value of the API.

Value	Description	Difficulty Value
Any	Any difficulty	-
Easy	Easy	"easy"
Medium	Medium	"medium"
Hard	Hard	"hard"

Question Types

The QuestionType enumerator contains all valid options for the "type" value of the API.

Value	Description	Type Value
Any	Any type of question	-
MultipleChoice	Multiple-choice question	"multiple"
TrueFalse	True or false question	"boolean"

Question Encoding

The Encoding enumerator contains all valid options for the "encoding" value of the API.

Value	Description	Encoding Value
HTML	HTML	-
LegacyURL	Legacy URL	"urlLegacy"
URL	URL	"url3986"
Base64	Base64	"base64"

Question

The Question class looks like this:

public class Question
{
  public string Type { get; set; }
  public string Difficulty { get; set; }
  public string Category { get; set; }
  public string QuestionTitle { get; set; }
  public string CorrectAnswer { get; set; }
  public string[] IncorrectAnswers { get; set; }
}

Category Question Count Lookup

If you need to determine how many questions are in a specific category you can do so with GetCategoryQuestionTotalsAsync()
This can be done with a specific Category:

await GetCategoryQuestionTotalsAsync(Category.Nature);
// returns a CategoryCount object.

Or with an integer representing the Category ID:

await GetCategoryQuestionTotalsAsync(17);
// returns a CategoryCount object.

CategoryCount

The CategoryCount class looks like this:

public class CategoryCount
{
  public int CategoryId { get; set; }
  public int TotalQuestions { get; set; }
  public int TotalEasyQuestions { get; set; }
  public int TotalMediumQuestions { get; set; }
  public int TotalHardQuestions { get; set; }
}

Global Question Count Lookup

If you need to find out things like how many questions there are in the entire database you should use GetGlobalQuestionTotalsAsync().

await GetGlobalQuestionTotalsAsync();
// returns a GlobalCount object.

GlobalCount

The GlobalCount class looks like this:

public class GlobalCount
{
  public int TotalQuestions { get; set; }
  public int TotalPendingQuestions { get; set; }
  public int TotalVerifiedQuestions { get; set; }
  public int TotalRejectedQuestions { get; set; }
  public List<GlobalCategoryCount> Categories { get; set; }
}

API Category Lookup

If you need to find just the categories provided by the API you should use GetApiCategoriesAsync() (although, you could always just look at the Category enum).

await GetApiCategoriesAsync()
// returns a List<ApiCategory> object.

ApiCategory

The ApiCategory class looks like this:

public class ApiCategory
{
  public int Id { get; set; }
  public string Name { get; set; }
}

API Coverage

This wrapper has 100% API coverage!

Legal Stuff

• Open Trivia DB API uses Creative Commons Attribution-ShareAlike 4.0 International License.
• OpenTDB-Wrapper uses GPL-3.0 License and is not affiliated with the Open Trivia Database.