Return file in ASP.Net Core Web API

by

If this is ASP.net-Core then you are mixing web API versions. Have the action return a derived IActionResult because in your current code the framework is treating HttpResponseMessage as a model.

[Route("api/[controller]")]
public class DownloadController : Controller {
    //GET api/download/12345abc
    [HttpGet("{id}")]
    public async Task<IActionResult> Download(string id) {
        Stream stream = await {{__get_stream_based_on_id_here__}}

        if(stream == null)
            return NotFound(); // returns a NotFoundResult with Status404NotFound response.

        return File(stream, "application/octet-stream"); // returns a FileStreamResult
    }    
}

Note:

The framework will dispose of the stream used in this case when the response is completed. If a using statement is used, the stream will be disposed before the response has been sent and result in an exception or corrupt response.

More Related Contents:

  1. Enable OPTIONS header for CORS on .NET Core Web API
  2. AddTransient, AddScoped and AddSingleton Services Differences
  3. Return View as String in .NET Core
  4. How to instantiate a DbContext in EF Core
  5. .NET Core DI, ways of passing parameters to constructor
  6. Automatic native and managed DLLs extracting from Nuget Package
  7. Send HTTP POST message in ASP.NET Core using HttpClient PostAsJsonAsync
  8. Hangfire – Multi tenant, ASP.NET Core – Resolving the correct tenant
  9. ASP.NET Core JWT mapping role claims to ClaimsIdentity
  10. How do I customize ASP.Net Core model binding errors?
  11. .NET Core and System.Drawing
  12. Inject service into Action Filter
  13. How to set json serializer settings in asp.net core 3?
  14. Setting the version number for .NET Core projects – CSPROJ – not JSON projects
  15. Hosting ASP.NET Core API in a Windows Forms Application
  16. Replace service registration in ASP.NET Core built-in DI container?
  17. How do I reference a .NET Framework project in a .NET Core project?
  18. How do I resolve the issue the request matched multiple endpoints in .Net Core Web Api
  19. Refresh Token using Polly with Named Client
  20. Using a Scoped service in a Singleton in an Asp.Net Core app
  21. How to use SqlClient in ASP.NET Core?
  22. Entity Framework Core: `SqlNullValueException: Data is Null.` How to troubleshoot?
  23. Dependency Injection with classes other than a Controller class
  24. Cannot find command ‘dotnet ef’
  25. How to change the port number for Asp.Net core app?
  26. How to get user information in DbContext using Net Core
  27. How should I manage DbContext Lifetime in MVC Core?
  28. How to resolve .net core build error NETDSDK1061 and warning MSB3277
  29. What Nuget packages must be referenced by an ASP.NET Core 6 application parts project
  30. No service for type ‘Microsoft.AspNetCore.Identity.UserManager`1[Microsoft.AspNetCore.Identity.IdentityUser]’ has been registered

Leave a Comment