UploadStream 3.1.1

dotnet add package UploadStream --version 3.1.1
NuGet\Install-Package UploadStream -Version 3.1.1
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="UploadStream" Version="3.1.1" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add UploadStream --version 3.1.1
#r "nuget: UploadStream, 3.1.1"
#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 UploadStream as a Cake Addin
#addin nuget:?package=UploadStream&version=3.1.1

// Install UploadStream as a Cake Tool
#tool nuget:?package=UploadStream&version=3.1.1

Optimise multi-part streaming file upload performance, offering 10x improvement in performance, and reduced memory allocation (10%-40%).

By default dotnet model form model binding loads the entire stream into memory using IFormFile - this is non-ideal for large files where processing of the stream should occur during streaming rather then buffering entire file(s) to memory/disk.

This package allows upload streams to be asynchronously processed via a delegate while maintaining generic model binding functionality with ModelState validation.

public async Task<IActionResult> Upload() {
    // returns a generic typed model, alternatively non-generic overload if no model binding is required
    MyModel model = await this.StreamFiles<MyModel>(async formFile => {
        // implement processing of stream as required via an IFormFile interface
        using (var stream = formfile.OpenReadStream())
            await ...
    // ModelState is still validated from model


Results are normalised in comparison to default dotnet IFormFile model binding, the UploadStream package offers around 10x performance improvement and 10%-40% improvement in memory allocation.

Out of interest a comparison to file uploads via a base64 model was performed, interestingly this actually offers improved performance (1.5x - 2.5x) with a cost of increased memory allocations (0.3x - 0.1x) and increased memory heap trashing (gc gen1/gen2).

| Alias | File sizes | StreamFiles (us/alloc) | Base64 (us/alloc) |
|------ |-----------:|-----------------------:|------------------:|
|    Xs |    5.94 KB |          1.14x / 1.23x |     1.16x / 1.44x |
|    Sm |  106.53 KB |          3.98x / 1.43x |     2.85x / 0.30x |
|    Md |  865.37 KB |          8.66x / 1.24x |     2.36x / 0.09x |
|    Lg |    6.04 MB |          9.86x / 1.09x |     1.97x / 0.11x |
|    Xl |   21.91 MB |          9.16x / 1.08x |     1.72x / 0.14x |
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 netcoreapp3.1 is compatible. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.
  • .NETCoreApp 3.1

    • No dependencies.

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
3.1.1 191,573 3/5/2020
3.1.0 722 3/5/2020
2.2.0 24,022 12/5/2018
1.0.1 2,152 6/9/2018
1.0.0 2,217 5/29/2018