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FileSystemProviderBase.DeleteFolder(FileManagerFolder) Method

Override this method to implement folder deletion.

Namespace: DevExpress.Web

Assembly: DevExpress.Web.v21.1.dll

Declaration

public virtual void DeleteFolder(
    FileManagerFolder folder
)

Parameters

Name Type Description
folder FileManagerFolder

A FileManagerFolder object that is the deleted folder.

Remarks

If you create a custom file system provider inherited from the FileSystemProviderBase class, you can override the DeleteFolder method to perform folder deletion.

By default, the method has no implementation, and should be overridden if folder deletion is allowed (the FileManagerSettingsEditing.AllowDelete property is set to true).

Example

using DevExpress.Web.ASPxFileManager;
using System.IO;
public class LinqFileSystemProvider : FileSystemProviderBase {
    const int DbRootItemId = 1;
    DbFileSystemDataContext dataContext;
    Dictionary<int, DbFileSystemItem> folderCache;
    string rootFolderDisplayName;

    public LinqFileSystemProvider(string rootFolder)
        : base(rootFolder) {
        this.dataContext = new DbFileSystemDataContext();
        RefreshFolderCache();
    }

    public DbFileSystemDataContext DataContext { get { return dataContext; } }

    // Used to decrease the number of recursive LINQ to SQL queries made to a database
    public Dictionary<int, DbFileSystemItem> FolderCache { get { return folderCache; } }


    public override string RootFolderDisplayName { get { return rootFolderDisplayName; } }

    public override IEnumerable<FileManagerFile> GetFiles(FileManagerFolder folder) {
        DbFileSystemItem dbFolderItem = FindDbFolderItem(folder);
        return
            from dbItem in DataContext.DbFileSystemItems
            where !dbItem.IsFolder && dbItem.ParentId == dbFolderItem.Id
            select new FileManagerFile(this, folder, dbItem.Name);
    }
    public override IEnumerable<FileManagerFolder> GetFolders(FileManagerFolder parentFolder) {
        DbFileSystemItem dbFolderItem = FindDbFolderItem(parentFolder);
        return
            from dbItem in FolderCache.Values
            where dbItem.IsFolder && dbItem.ParentId == dbFolderItem.Id
            select new FileManagerFolder(this, parentFolder, dbItem.Name);
    }
    public override bool Exists(FileManagerFile file) {
        return FindDbFileItem(file) != null;
    }
    public override bool Exists(FileManagerFolder folder) {
        return FindDbFolderItem(folder) != null;
    }
    public override System.IO.Stream ReadFile(FileManagerFile file) {
        return new MemoryStream(FindDbFileItem(file).Data.ToArray());
    }
    public override DateTime GetLastWriteTime(FileManagerFile file) {
        var dbFileItem = FindDbFileItem(file);
        return dbFileItem.LastWriteTime.GetValueOrDefault(DateTime.Now);
    }

    // File/folder management operations
    public override void CreateFolder(FileManagerFolder parent, string name) {
        UpdateAndSubmitChanges(parent,
            dbItem => DataContext.DbFileSystemItems.InsertOnSubmit(new DbFileSystemItem() {
                IsFolder = true,
                LastWriteTime = DateTime.Now,
                Name = name,
                ParentId = dbItem.Id
            }));
    }
    public override void DeleteFile(FileManagerFile file) {
        UpdateAndSubmitChanges(file, dbItem =>
DataContext.DbFileSystemItems.DeleteOnSubmit(dbItem));
    }
    public override voi