@using System.IO

@if (ShouldRenderFileManager)
{
    <TelerikFileManager @ref="@FileManagerRef"
                        Data="@Files"
                        @bind-Path="@DirectoryPath"
                        View="@CurrentView"
                        ViewChanged="@OnViewChanged"
                        Height="400px"
                        OnCreate="@OnCreateHandler"
                        OnUpdate="@OnUpdateHandler"
                        OnDelete="@OnDeleteHandler"
                        OnModelInit="@OnModelInitHandler"
                        OnDownload="@OnDownloadHandler"
                        SelectedItems="@SelectedItems"
                        SelectedItemsChanged="@((IEnumerable<FlatFileEntry> selectedFiles) => OnSelect(selectedFiles))">
    </TelerikFileManager>
}

@foreach (var item in Files)
{
    <div>@item.Name</div>
}

@code {
    private bool ShouldRenderFileManager { get; set; } = true;

    private TelerikFileManager<FlatFileEntry>? FileManagerRef { get; set; }
    private List<FlatFileEntry> Files { get; set; } = new();

    private string DirectoryPath { get; set; } = string.Empty;

    private IEnumerable<FlatFileEntry> SelectedItems { get; set; } = new List<FlatFileEntry>();

    private FileManagerViewType CurrentView { get; set; }

    private void OnViewChanged(FileManagerViewType newView)
    {
        CurrentView = newView;
    }

    private async Task OnCreateHandler(FileManagerCreateEventArgs args)
    {
        var newFolder = args.Item as FlatFileEntry;

        var parent = GetParent(newFolder, DirectoryPath);

        newFolder.Id = "20";
        newFolder.ParentId = parent.Id;
        newFolder.Name = "New folder";
        newFolder.IsDirectory = true;
        newFolder.HasDirectories = false;
        newFolder.DateCreated = DateTime.Now;
        newFolder.DateCreatedUtc = DateTime.Now;
        newFolder.DateModified = DateTime.Now;
        newFolder.DateModifiedUtc = DateTime.Now;
        newFolder.Path = Path.Combine(DirectoryPath, newFolder.Name);
        newFolder.Extension = null;

        var parentDirectory = GetDirectory(DirectoryPath) ?? GetParent(newFolder, DirectoryPath);

        if (parentDirectory != null)
        {
            // Simulate add to the file system.
            newFolder.ParentId = parentDirectory.Id;
            Files.Add(newFolder);
            parentDirectory.HasDirectories = Files.Count(x => x.ParentId == parentDirectory.Id) > 0;
        }
        else
        {
            // Create a folder in the root directory.
            Files.Add(newFolder);
        }

        RefreshData();
    }

    private FlatFileEntry GetDirectory(string path)
    {
        var directory = Files.FirstOrDefault(x => x.IsDirectory && x.Path == path);

        return directory;
    }

    private FlatFileEntry GetParent(FlatFileEntry currItem, string currDirectory)
    {
        var parentItem = Files
            .FirstOrDefault(x => x.IsDirectory && x.Path == currDirectory);

        return parentItem;
    }


    private async Task OnUpdateHandler(FileManagerUpdateEventArgs args)
    {
        var item = args.Item as FlatFileEntry;

        if (item.IsDirectory)
        {
            var name = item.Name ?? string.Empty;

            var updatedItem = Files.FirstOrDefault(x => x.Id == item.Id);
            updatedItem.Name = item.Name;
            updatedItem.Path = Path.Combine(DirectoryPath, name);

            ShouldRenderFileManager = false;
            await Task.Delay(1);
            ShouldRenderFileManager = true;
        }
        else
        {
            // The name property is updated, but also update the path to the file.
            var name = item.Name ?? string.Empty;
            var extension = item.Extension ?? string.Empty;
            var fullName = extension.Length > 0 && name.EndsWith(extension) ?
                name : $"{name}{extension}";

            var updatedItem = Files.FirstOrDefault(x => x.Id == item.Id);

            updatedItem.Name = item.Name;
            updatedItem.Path = Path.Combine(DirectoryPath, fullName);
            Console.WriteLine(updatedItem.Path);
        }
    }

    private async Task OnDownloadHandler(FileManagerDownloadEventArgs args)
    {
        var selectedItem = args.Item as FlatFileEntry;

        // The Filemanager does not have the actual file.
        // Obtain the file contents, based on args.Item, and set the event arguments:

        //args.Stream = the file stream of the actual selected file;
        //args.MimeType = the MIME type of the actual file;
        //args.FileName = the file name that the browser will receive (optional);

        FlatFileEntry actualFile = (FlatFileEntry)args.Item;

        string dummyFileContent = $"This file is a dummy version of {actualFile.Name}. It was downloaded with the Telerik Blazor FileManager.";
        byte[] dummyFileBuffer = System.Text.Encoding.UTF8.GetBytes(dummyFileContent);

        args.Stream = new MemoryStream(dummyFileBuffer);
        args.MimeType = "text/plain";
        args.FileName = $"filemanager-{actualFile.Name}-{DateTime.Now.ToString("yyyy-MM-dd-HH-mm-ss")}.txt";
    }

    private async Task OnDeleteHandler(FileManagerDeleteEventArgs args)
    {
        var currItem = args.Item as FlatFileEntry;

        var itemToDelete = Files.FirstOrDefault(x => x.Id == currItem.Id);

        Files.Remove(itemToDelete);

        RefreshData();
    }

    private FlatFileEntry OnModelInitHandler()
    {
        var item = new FlatFileEntry();
        item.Name = $"New folder";
        item.Size = 0;
        item.Path = Path.Combine(DirectoryPath, item.Name);
        item.IsDirectory = true;
        item.HasDirectories = false;
        item.DateCreated = DateTime.Now;
        item.DateCreatedUtc = DateTime.Now;
        item.DateModified = DateTime.Now;
        item.DateModifiedUtc = DateTime.Now;

        return item;
    }

    private void OnSelect(IEnumerable<FlatFileEntry> selectedFiles)
    {
        // Update the view model.
        SelectedItems = selectedFiles;
    }

    private void RefreshData()
    {
        Files = new List<FlatFileEntry>(Files);
    }

    protected override async Task OnInitializedAsync()
    {
        Files = await GetFlatFileEntries();
    }

    public class FlatFileEntry
    {
        public string Id { get; set; }
        public string ParentId { get; set; }
        public string Name { get; set; }
        public long Size { get; set; }
        public string Path { get; set; }
        public string Extension { get; set; }
        public bool IsDirectory { get; set; }
        public bool HasDirectories { get; set; }
        public DateTime DateCreated { get; set; }
        public DateTime DateCreatedUtc { get; set; }
        public DateTime DateModified { get; set; }
        public DateTime DateModifiedUtc { get; set; }
    }

    // the next lines are hardcoded data generation so you can explore the FileManager freely

    private async Task<List<FlatFileEntry>> GetFlatFileEntries()
    {
        var workFiles = new FlatFileEntry()
        {
            Id = "1",
            ParentId = null,
            Name = "Work Files",
            IsDirectory = true,
            HasDirectories = true,
            DateCreated = new DateTime(2022, 1, 2),
            DateCreatedUtc = new DateTime(2022, 1, 2),
            DateModified = new DateTime(2022, 2, 3),
            DateModifiedUtc = new DateTime(2022, 2, 3),
            Path = Path.Combine("files"),
            Size = 3 * 1024 * 1024
        };

        var Documents = new FlatFileEntry()
        {
            Id = "2",
            ParentId = workFiles.Id,
            Name = "Documents",
            IsDirectory = true,
            HasDirectories = false,
            DateCreated = new DateTime(2022, 1, 2),
            DateCreatedUtc = new DateTime(2022, 1, 2),
            DateModified = new DateTime(2022, 2, 3),
            DateModifiedUtc = new DateTime(2022, 2, 3),
            Path = Path.Combine(workFiles.Path, "documents"),
            Size = 1024 * 1024
        };

        var Images = new FlatFileEntry()
        {
            Id = "3",
            ParentId = workFiles.Id,
            Name = "Images",
            IsDirectory = true,
            HasDirectories = false,
            DateCreated = new DateTime(2022, 1, 2),
            DateCreatedUtc = new DateTime(2022, 1, 2),
            DateModified = new DateTime(2022, 2, 3),
            DateModifiedUtc = new DateTime(2022, 2, 3),
            Path = Path.Combine(workFiles.Path, "images"),
            Size = 2 * 1024 * 1024
        };

        var files = new List<FlatFileEntry>()
{
            workFiles,

            Documents,

            Images
        };

        return files;
    }
}

System.OverflowException: Value was either too large or too small for a Decimal.

<TelerikGrid Data="@GridData"
             Pageable="true"
             @bind-PageSize="@GridPageSize"
             Navigable="true">
    <GridSettings>
        <GridPagerSettings InputType="@GridPagerInputType"
                           PageSizes="@( new List<int?> { 2, 5 } )" />
    </GridSettings>

    <GridColumns>
        <GridColumn Field="@nameof(SampleModel.Name)" />
    </GridColumns>
</TelerikGrid>

@code {
    private List<SampleModel> GridData { get; set; } = new();

    private int GridPageSize { get; set; } = 5;

    //private PagerInputType GridPagerInputType { get; set; } = PagerInputType.Input;
    private PagerInputType GridPagerInputType => GridPageSize >= GridData.Count ? PagerInputType.Buttons : PagerInputType.Input;

    protected override void OnInitialized()
    {
        for (int i = 1; i <= 3; i++)
        {
            GridData.Add(new SampleModel()
            {
                Id = i,
                Name = $"Name {i}"
            });
        }
    }

    public class SampleModel
    {
        public int Id { get; set; }
        public string Name { get; set; } = string.Empty;
    }
}