Add an upload button to your swagger page

The swagger adventures continue…

In .NET Core the current recommended way to upload a file in ASP.NET is with an IFormFile.

If you’re using an IFormFile in your ASP.NET Web Api like so:

[HttpPost("upload")]
public IActionResult UploadFile(IFormFile file)
{

If you do this, the Swagger page as rendered by Swashbuckle won’t look correct:
Image may be NSFW.
Clik here to view.

However, if you install version 2.5.0 or later of my Swashbuckle.AspNetCore.Examples NuGet package, then you can add the [AddSwaggerFileUploadButton] attribute to your controller action, like so:

[HttpPost("upload")]
[AddSwaggerFileUploadButton]
public IActionResult UploadFile(IFormFile file)
{

and then enable my filter in your Startup.cs:

services.AddSwaggerGen(c =>
{
    c.OperationFilter<AddFileParamTypesOperationFilter>();

Then you’ll get a nice upload button:
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Clik here to view.