HeroKit.FileTypes.AspNetCore 3.7.0

.NET 8.0 This package targets .NET 8.0. The package is compatible with this framework or higher. 
dotnet add package HeroKit.FileTypes.AspNetCore --version 3.7.0
                    


                    

                
NuGet\Install-Package HeroKit.FileTypes.AspNetCore -Version 3.7.0
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="HeroKit.FileTypes.AspNetCore" Version="3.7.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="HeroKit.FileTypes.AspNetCore" Version="3.7.0" />
                    


                            Directory.Packages.props
                        

                    

                
<PackageReference Include="HeroKit.FileTypes.AspNetCore" />
                    


                            Project file
For projects that support Central Package Management (CPM), copy this XML node into the solution Directory.Packages.props file to version the package. 
paket add HeroKit.FileTypes.AspNetCore --version 3.7.0
                    


                    

                
#r "nuget: HeroKit.FileTypes.AspNetCore, 3.7.0"
#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. 
#:package HeroKit.FileTypes.AspNetCore@3.7.0
#:package directive can be used in C# file-based apps starting in .NET 10 preview 4. Copy this into a .cs file before any lines of code to reference the package. 
#addin nuget:?package=HeroKit.FileTypes.AspNetCore&version=3.7.0
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=HeroKit.FileTypes.AspNetCore&version=3.7.0
                    


                            Install as a Cake Tool

HeroKit.FileTypes.AspNetCore

ASP.NET Core integration for HeroKit.FileTypes: safe upload checks for IFormFile in minimal APIs, MVC, Razor Pages and Blazor.

dotnet add package HeroKit.FileTypes.AspNetCore

Every check of UploadValidator runs: invalid file names, program or script content (also behind an image extension), hidden double extensions (a.php.jpg), content that does not fit the extension, macros in Office documents, script in SVG, size and allowed types.

Minimal APIs

using HeroKit.FileTypes;
using HeroKit.FileTypes.AspNetCore;

app.MapPost("/documents", (IFormFile file) => Results.Ok(file.GetSafeFileName()))
   .ValidateUploads(new UploadPolicy { AllowedTypes = [FileTypes.Pdf], MaxLength = 10 * 1024 * 1024 });

A rejected file stops the request before the handler runs. The response is 400 with a validation problem:

{ "errors": { "file": ["invoice.pdf: The content is a Windows executable."] } }

ValidateUploads also works on a route group and checks IFormFileCollection arguments.

MVC, Razor Pages and Blazor forms

public sealed class ProfileForm
{
    [Required, AllowedFileTypes("jpg", "png", "webp", MaxLength = 5 * 1024 * 1024)]
    public IFormFile? Photo { get; set; }
}

Anywhere

UploadCheckResult result = file.CheckUpload(policy);   // or validator.Validate(file) with a singleton UploadValidator
string displayName = file.GetSafeFileName();            // safe to store and to send as a download name

Documentation: https://herokit.lyconiq.com/articles/file-types.html

Product Compatible and additional computed target framework versions.
.NET net8.0 is compatible.  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.  net9.0 was computed.  net9.0-android was computed.  net9.0-browser was computed.  net9.0-ios was computed.  net9.0-maccatalyst was computed.  net9.0-macos was computed.  net9.0-tvos was computed.  net9.0-windows was computed.  net10.0 is compatible.  net10.0-android was computed.  net10.0-browser was computed.  net10.0-ios was computed.  net10.0-maccatalyst was computed.  net10.0-macos was computed.  net10.0-tvos was computed.  net10.0-windows was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last Updated
3.7.0 73 10/19/2026

First release: IFormFile.CheckUpload, UploadValidator.Validate(IFormFile), IFormFile.GetSafeFileName, [AllowedFileTypes] and the ValidateUploads() endpoint filter.