如何从 ASP.NET MVC 中的多个文件夹中获取文件？

Question

public ActionResult DisplayFiles()
{
    var getCategory = dbcontext.tblDetails.Select(x => x.Category).Distinct().ToList();
    ViewBag.Category = getCategory;

    foreach (string category in getCategory)
    {
        ViewBag.Images = Directory.EnumerateFiles(Server.MapPath("~/" + category)).Select(fn => "~/" + category + "/" + Path.GetFileName(fn));
    }

    return View();
}

I tried to upload it like this where category returns the folder names from the database of table tblDetails from where I want to get the files.

Actually the above code overrides the folder name after every iteration of the loop and provides the last category name to the Viewbag.Images and only display the files of that folder

Answer 1

Change your loop to something like: EDIT

List<string> images = new List<string>;
foreach (string category in getCategory)
{
    images.AddRange(Directory.EnumerateFiles(Server.MapPath("~/" + category))
               .Select(fn => "~/" + category + "/" + Path.GetFileName(fn)).ToList());
}
ViewBag.Images = images;

What you are doing in your loop is returning only the final image as the result will be over written on each iteration.

Answer 2

Actually the above code overrides the folder name after every iteration of the loop and provides the last category name to the Viewbag.Images and only display the files of that folder

You could try to use List<IEnumerable<string>> to store all folders with their file names

var data = new List<IEnumerable<string>>();

foreach (string category in getCategory)
{
    var images = Directory.EnumerateFiles(Server.MapPath("~/" + category)).Select(fn => "~/" + category + "/" + Path.GetFileName(fn));
    data.Add(images);
}
ViewBag.Images = data;

Then in your view, you could display them as a group like

@foreach( var folder in ViewBag.Images)
{      
    <ul>
        @foreach (var image in folder)
        {
            <li>@image</li>
        }
    </ul>

 }