mapo-core/MP.Stats/Pages/Download.cshtml.cs

using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using System.IO;

namespace MP.Stats.Pages
{
    /// <summary>
    /// Gestione donwnload file csv
    ///
    /// da valutare eventualmente xlsx con https://github.com/closedxml/closedxml
    /// </summary>
    public class DownloadModel : PageModel
    {
        #region Public Constructors

        public DownloadModel(IWebHostEnvironment env)
        {
            _env = env;
        }

        #endregion Public Constructors

        #region Public Methods

        public IActionResult OnGet()
        {
            string fileName = "OUT.csv";
            if (Request.Query.ContainsKey("fileName"))
            {
                fileName = Request.Query["fileName"];
            }
            var filePath = Path.Combine(_env.ContentRootPath, "temp\\", fileName);
            //var filePath = Path.Combine(_env.WebRootPath, "..\\temp\\", fileName);

            byte[] fileBytes = System.IO.File.ReadAllBytes(filePath);

            return File(fileBytes, "application/force-download", fileName);
        }

        #endregion Public Methods

        #region Private Fields

        private readonly IWebHostEnvironment _env;

        #endregion Private Fields
    }
}