asp.net mvc3 下上傳檔案

一 建立表單

@using (Html.BeginForm("Index", "Home", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
    <input type="file" name="file" />
    <input type="submit" value="OK" />
}

二  建立controlle

public class HomeController : Controller
{
// This action renders the form
    public ActionResult Index()
    {
return View();
    }

// This action handles the form POST and the upload
    [HttpPost]
public ActionResult Index(HttpPostedFileBase file)
    {
// Verify that the user selected a file
        if (file != null && file.ContentLength > 0) 
        {
// extract only the fielname
            var fileName = Path.GetFileName(file.FileName);
// store the file inside ~/App_Data/uploads folder
            var path = Path.Combine(Server.MapPath("~/App_Data/uploads"), fileName);
            file.SaveAs(path);
        }
// redirect back to the index action to show the form once again
        return RedirectToAction("Index");        
    }
}