Multiple File Upload in Forms in ASP.NET Core Razor Pages

On the Visual Studio, create new ASP.NET Core Web Application project

Select Empty Template

Click Ok button to Finish

Create new folder named wwwroot

Create new folder named images in wwwroot folder.

Open Startup.cs file and add new configurations as below:

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.DependencyInjection;

namespace LearnASPNETCoreRazorPagesWithRealApps
{
    public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddMvc();
        }

        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.UseStaticFiles();

            app.UseMvc();
        }
    }
}

Select Views folder and right click to select Add\New Item Menu

Select Web\ASP.NET in left side. Select Razor View Imports item and click Add button to Finish

In _ViewImports.cshtml file and TagHelpers library as below:

@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers

Create new folder named Pages. In this folder, create new Razor Page named Index as below:

using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc.RazorPages;
using System.Collections.Generic;
using System.IO;

namespace LearnASPNETCoreRazorPagesWithRealApps.Pages
{
    public class IndexModel : PageModel
    {
        private IHostingEnvironment ihostingEnvironment;

        public List<string> FileNames { get; set; }

        public IndexModel(IHostingEnvironment ihostingEnvironment)
        {
            this.ihostingEnvironment = ihostingEnvironment;
        }

        public void OnGet()
        {
        }

        public void OnPost(IFormFile[] photos)
        {
            if (photos != null && photos.Length > 0)
            {
                FileNames = new List<string>();
                foreach (IFormFile photo in photos)
                {
                    var path = Path.Combine(ihostingEnvironment.WebRootPath, "images", photo.FileName);
                    var stream = new FileStream(path, FileMode.Create);
                    photo.CopyToAsync(stream);
                    FileNames.Add(photo.FileName);
                }
            }
        }

    }
}

@page
@model LearnASPNETCoreRazorPagesWithRealApps.Pages.IndexModel
@{
    Layout = null;
}

<!DOCTYPE html>

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Index</title>
</head>
<body>

    <form method="post" asp-page="Index" enctype="multipart/form-data">
        Photos <input type="file" name="photos" multiple="multiple" accept="image/*" />
        <br />
        <input type="submit" value="Upload" />
        @if (Model.FileNames != null && Model.FileNames.Count > 0)
        {
            <ul>
                @foreach (var fileName in Model.FileNames)
                {
                    <li><img src="~/images/@fileName" /></li>
                }
            </ul>
        }
    </form>

</body>
</html>

Open Index Razor Page with following url: http://localhost:1115

Select multiple image files and click Upload button submit form to OnPost action in Index razor page with following url: http://localhost:1115/

Output

Multiple File Upload in Forms in ASP.NET Core Razor Pages

Create ASP.NET Core Razor Pages Project

wwwroot Folder

Images Folder

Configurations

Create Razor View Imports

Create Razor Page

Index.cshtml.cs

Index.cshtml

Structure of ASP.NET Core Razor Pages Project

Run Application