FileTypeInterrogator 1.0.0

There is a newer version of this package available.
See the version list below for details.
dotnet add package FileTypeInterrogator --version 1.0.0
NuGet\Install-Package FileTypeInterrogator -Version 1.0.0
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
<PackageReference Include="FileTypeInterrogator" Version="1.0.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add FileTypeInterrogator --version 1.0.0
#r "nuget: FileTypeInterrogator, 1.0.0"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.
// Install FileTypeInterrogator as a Cake Addin
#addin nuget:?package=FileTypeInterrogator&version=1.0.0

// Install FileTypeInterrogator as a Cake Tool
#tool nuget:?package=FileTypeInterrogator&version=1.0.0


netstandard library for detecting file types by 'magic numbers', similar to the file command in Linux/Unix. Useful for validating file uploads instead of trusting file extensions.


IFileTypeInterrogator interrogator = new FileTypeInterrogator();

byte[] fileBytes = File.ReadAllBytes("pdfFile.pdf");

FileTypeInfo fileTypeInfo = interrogator.DetectType(fileBytes);

Console.WriteLine("Name = " + fileTypeInfo.Name);
Console.WriteLine("Extension = " + fileTypeInfo.FileType);
Console.WriteLine("Mime Type = " + fileTypeInfo.MimeType);

// The following output would be displayed:
// Name = Portable Document Format File
// Extension = pdf
// Mime Type = application/pdf

Notice that IFileTypeInterrogator was assigned, meaning custom implementations are welcomed. File definitions are provided in the source and will be regularly updated, feel free to submit an issue or pull request to add other signatures. To quickly provide support for a new signature, create an instance of CustomFileTypeInterrogator:

IFileTypeInterrogator interrogator = new CustomFileTypeInterrogator("path_to_custom_definitions_file", Encoding.UTF8);

FileTypeInfo fileTypeInfo = interrogator.DetectType(...);

It is best to create a single instance and manage it's lifetime through an IOC/DI Container.

Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  net5.0-windows was computed.  net6.0 was computed.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 was computed.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed.  net8.0 was computed.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed. 
.NET Core netcoreapp1.0 was computed.  netcoreapp1.1 was computed.  netcoreapp2.0 was computed.  netcoreapp2.1 was computed.  netcoreapp2.2 was computed.  netcoreapp3.0 was computed.  netcoreapp3.1 was computed. 
.NET Standard netstandard1.3 is compatible.  netstandard1.4 was computed.  netstandard1.5 was computed.  netstandard1.6 was computed.  netstandard2.0 was computed.  netstandard2.1 was computed. 
.NET Framework net46 was computed.  net461 was computed.  net462 was computed.  net463 was computed.  net47 was computed.  net471 was computed.  net472 was computed.  net48 was computed.  net481 was computed. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen tizen30 was computed.  tizen40 was computed.  tizen60 was computed. 
Universal Windows Platform uap was computed.  uap10.0 was computed. 
Xamarin.iOS xamarinios was computed. 
Xamarin.Mac xamarinmac was computed. 
Xamarin.TVOS xamarintvos was computed. 
Xamarin.WatchOS xamarinwatchos was computed. 
Compatible target framework(s)
Additional computed target framework(s)
Learn more about Target Frameworks and .NET Standard.

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Version Downloads Last updated
1.1.0 60,396 1/31/2022
1.0.0 40,944 7/8/2019

Update to use flat file definitions, unit tested