.NET Core 2: How to check if the request is MIME multipart Content?

Question

In ASp.NET MVC, you can check if the current request is MIME multipart content. How to check that in .NET Core? I have an action filter to validate that, but not sure how to evaluate to request header. IsMimeMultipartContent is not available in .NET Core.

/// <summary>
/// Checks whether the current request specified content is MIME multipart content.
/// </summary>
/// <exception cref="HttpRequestException">Raised when the current request doesn't have MIME multipart content.</exception>
public class HasMimeMultipartContentAttribute : ActionFilterAttribute
{
    public override void OnResultExecuting(ResultExecutingContext context)
    {
        if (!context.HttpContext.Request.Headers.IsMimeMultipartContent())
            throw new HttpRequestException("This request does not contain any file to upload.");
    }
}

Answer 1

ASP.NET MVC Core uses the IFormFile interface to bind multipart HTTP requests. If the request does not use multipart/form-data, the documentation states that the bound value will be null.