In this article I will explain with an example, how to fetch File from Form Collection in ASP.Net Core MVC.
The uploaded Files are available in the Request.Form.Files collection in ASP.Net Core MVC.
Note: For beginners in ASP.Net Core MVC, please refer my article ASP.Net MVC Core Hello World Tutorial with Sample Program example.
 
 
Namespaces
You will need to import the following namespaces.
using System.IO;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
 
 
Controller
The Controller consists of two Action methods.
Action method for handling GET operation
Inside this Action method, simply the View is returned.
 
Action method for handling POST operation
This Action method handles the operation of uploading of File.
The File is fetched from the Request.Form.Files collection using the name of the HTML FileUpload element.
Then a check is performed whether Directory (Folder) exists if not then the Directory (Folder) is created inside the www Folder using IHostingEnvironment interface and then the file is saved to the Directory (Folder) using the FileStream class.
Note: For more details about IHostingEnvironment interface, please refer Using IHostingEnvironment in ASP.Net Core.
 
Finally, a message is displayed to the user using TempData and a redirection is done to the Index Action method.
Note: For more details on displaying message using TempData, please refer my article ASP.Net Core MVC: TempData Tutorial with example.
 
public class HomeController : Controller
{
    private IHostingEnvironment Environment;
 
    public HomeController(IHostingEnvironment _environment)
    {
        Environment = _environment;
    }
 
    public IActionResult Index()
    {
        return View();
    }
 
    [HttpPost]
    public IActionResult Upload()
    {
        if (Request.Form.Files.Count > 0)
        {
            IFormFile postedFile = Request.Form.Files["postedFile"];
            string path = Path.Combine(this.Environment.WebRootPath, "Uploads");
            if (!Directory.Exists(path))
            {
                Directory.CreateDirectory(path);
            }
 
            string fileName = Path.GetFileName(postedFile.FileName);
            using (FileStream stream = new FileStream(Path.Combine(path, fileName), FileMode.Create))
            {
                postedFile.CopyTo(stream);
                TempData["Message"] = "File uploaded successfully.";
            }
        }
 
        return RedirectToAction("Index");
    }
}
 
 
View
The View consists of an HTML Form which has been created using the Razor Tag attributes with the following attributes.
asp-action – Name of the Action. In this case the name is Upload.
asp-controller – Name of the Controller. In this case the name is Home.
method – It specifies the Form Method i.e. GET or POST. In this case it will be set to POST.
There is an HTML FileUpload element, a Submit Button and a SPAN element for displaying Message enclosed in the Form element.
The HTML Form has been specified with enctype=“multipart/form-data” attribute as it is necessary for File Upload operation.
@addTagHelper*, Microsoft.AspNetCore.Mvc.TagHelpers
@{
    Layout = null;
}
 
<!DOCTYPE html>
 
<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Index</title>
</head>
<body>
    <form method="post" enctype="multipart/form-data" asp-controller="Home" asp-action="Upload">
        <span>Select File:</span>
        <input type="file" name="postedFile" />
        <hr />
        <input type="submit" value="Upload" />
        <br/>
        <span style="color:green">@TempData["Message"]</span>
    </form>
</body>
</html>
 
 
Screenshot
ASP.Net Core MVC: Fetch File from Request.Form.Files Collection
 
 
Downloads
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