Asp net core download file

The runtime includes everything you need to run. NET applications. The runtime is also included in the SDK. NET Core Runtime 3. NET Core Module v2 NET Desktop Runtime 3. Downloads for. NET Runtime 3. If using an older patch release, you should upgrade to get these fixes. Guest User Updated date May 06, In an empty project, update the Startup class to add services and middleware for MVC. You could also have IFormFile as a property on model received by the action method.

Note The name on input elements must match action parameter name or model property name for model binding to work.

Action method needs to return FileResult with either a stream , byte[], or virtual path of the file. Next Recommended Reading. Please see the below example to achieve the same. As we know FileResult is an abstract base class. FileStreamResult — Sends binary content to the response by using a Stream instance. Here you have a stream and want to return stream content as a file.

FileContentResult — Sends the contents of a binary file to the response. Here you have a byte array and want to return byte content as a file. Below are a few examples of MIME — content types for your information. Please bookmark this page and share this article with your friends and Subscribe to the blog to get a notification on freshly published best practices of software development. This article was helpful. I did write my custom interface in the above code which returns the stream and achieved the result.

Improve this question. Askolein 2, 2 2 gold badges 25 25 silver badges 36 36 bronze badges. Add a comment. Active Oldest Votes. Improve this answer. Any Thoughts? The only way to solve this problem is by finding out the real error, which often is unrelated to business logic, much probably being a programming error like NullReferenceException or conversion between incompatible types, etc.

Log files and debugging are some valid ways to troubleshot this kind of issue. I am downloading excel file. It downloads but when I try to open the file it says the file is corrupted. But when I download it is 10kb. What kind of problem is this? This is an old answer, but my comment still applies. This code leaks a MemoryStream. The MemoryStream should be nested in a using block so that managed resources can be disposed.

If he using is added, the method can't return the File because the MemoryStream goes out of scope and is disposed before the file is returned. The ASP. NET Core infrastructure takes care of disposing the stream when sending the response, so there's no leak see the FileResultExecutorBase.

WriteFileAsync method. If you try to surround this code with a using statement, no file will be sent. You can try below code to download the file. JacobIRR 7, 6 6 gold badges 31 31 silver badges 54 54 bronze badges. XamDev XamDev 2, 8 8 gold badges 47 47 silver badges 82 82 bronze badges.