ZNetCS.AspNetCore.ResumingFileResults

A small package to allow using resume during transfering data over MVC application in ASP.NET Core.

It allows provide ETag header as well as Last-Modified one. It also supports following precondition headers: If-Match, If-None-Match, If-Modified-Since , If-Unmodified-Since, If-Range.

ASP.NET Core 2.0

As from version 2.0 resuming is supported out of box inside ASP.NET Core. So all code related to resuming was removed. I left only part for Content-Disposition inline. Now all code relies on base .NET classes. Also support for multipart request is removed. To support that I would have to copy a lot of original code, because currently there is no way to simple override some part of base classes.

Installing

Install using the ZNetCS.AspNetCore.ResumingFileResults NuGet package

PM> Install-Package ZNetCS.AspNetCore.ResumingFileResults

Usage

When you install the package, it should be added to your .csproj. Alternatively, you can add it directly by adding:

<ItemGroup>
    <PackageReference Include="ZNetCS.AspNetCore.ResumingFileResults" Version="6.0.1" />
</ItemGroup>

.NET 6

// Add services to the container.
builder.Services.AddResumingFileResult();

.NET 5 and Below

In order to use the ResumingFileResults, you must configure the services in the ConfigureServices call of Startup:

public void ConfigureServices(IServiceCollection services)
{
    services.AddResumingFileResult();
}

Use inside controller

Then in your controller you can use it in similar way as build in FileResult helpers.

using ZNetCS.AspNetCore.ResumingFileResults.Extensions;

...

public IActionResult FileContents()
{
    string webRoot = this.hostingEnvironment.WebRootPath;
    var contents = System.IO.File.ReadAllBytes(Path.Combine(webRoot, "TestFile.txt"));

    return this.ResumingFile(contents, "text/plain", "TestFile.txt");
}

...

public IActionResult FileStream()
{
    string webRoot = this.hostingEnvironment.WebRootPath;
    FileStream stream = System.IO.File.OpenRead(Path.Combine(webRoot, "TestFile.txt"));
    return this.ResumingFile(stream, "text/plain", "TestFile.txt");
}

...
       
public IActionResult PhysicalFile()
{
    string webRoot = this.hostingEnvironment.WebRootPath;
    return this.ResumingPhysicalFile(Path.Combine(webRoot, "TestFile.txt"), "text/plain", "TestFile.txt");
}

...
    
public IActionResult VirtualFile()
{
    return this.ResumingFile("TestFile.txt", "text/plain", "TestFile.txt");
}

Above examples will serve your data as Content-Disposition: attachment. When fileName is not provided then data is served as Content-Disposition: inline. Additionaly it is possible provide ETag and LastModified headers.

public IActionResult File()
{
    return new ResumingVirtualFileResult("TestFile.txt", "text/plain", "\"MyEtagHeader\"") 
    { 
        FileDownloadName = "TestFile.txt", 
        LastModified = DateTimeOffset.Now 
    };
}