Home > Backend Development > C++ > body text

How to Return Files from an ASP.NET Core Web API Controller?

Barbara Streisand
Release: 2024-11-01 04:14:02
Original
192 people have browsed it

How to Return Files from an ASP.NET Core Web API Controller?

Dealing with File Downloads in ASP.NET Core Web API

When attempting to return a file from an ASP.NET Web API Controller, you may encounter issues with the response being treated as JSON. To resolve this, it's crucial to understand the correct approach to file download in ASP.NET Core.

To return a file in ASP.NET Core Web API, you need to return a derived IActionResult instead of HttpResponseMessage. The framework will interpret HttpResponseMessage as a model, leading to the JSON response issue.

Below is an updated code example that demonstrates how to return a file using IActionResult:

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

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

        return File(stream, "application/octet-stream", $"{FileName}.{FileExtension}"); // Returns a FileStreamResult
    }
}</code>
Copy after login

Note: Do not use a using statement for the stream; otherwise, it will be disposed of before the response has been sent, resulting in an exception or corrupt response. The framework will handle stream disposal automatically when the response is completed.

The above is the detailed content of How to Return Files from an ASP.NET Core Web API Controller?. For more information, please follow other related articles on the PHP Chinese website!

source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Latest Articles by Author
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template
About us Disclaimer Sitemap
php.cn:Public welfare online PHP training,Help PHP learners grow quickly!