FileManagerSettings.ThumbnailFolder Property
Specifies the path to the folder that contains thumbnails.
Namespace: DevExpress.Web
Assembly: DevExpress.Web.v20.2.dll
NuGet Package: DevExpress.Web
Declaration
Property Value
| Type | Default | Description |
|---|---|---|
| String | String.Empty | The thumbnails root path. |
Property Paths
You can access this nested property as listed below:
Remarks
For better performance, the file manager stores content-based thumbnails in the location specified by the ThumbnailFolder property.
Important
Note that the folder that contains thumbnails must be placed physically inside the application folder.
Note
- By default, thumbnails are created in the public “~\Thumb\“ folder that can result in unauthorized access to private files’ thumbnails.
Thumbnail folders structure is based on the source folder relative paths. Therefore, if you change the root folder dynamically, the file manager can display incorrect thumbnails.
We recommend you to dynamically specify a thumbnail folder and set restricted access for these thumbnail folders to prevent the issues described above. To learn more see the Security Considerations topic.
Concept
Example
Web Forms (declaratively):
<dx:ASPxFileManager ID="fileManager" runat="server" ...>
<Settings RootFolder="~/Content/FileManager/Files" ThumbnailFolder="~/Content/FileManager/Thumbnails"
AllowedFileExtensions=".jpg, .jpeg, .gif, .png" InitialFolder="~/Content/FileManager/Images"/>
...
</dx:ASPxFileManager>
Web Forms (in code):
ASPxFileManager fm = new ASPxFileManager();
fm.ID = "ASPxFileManager1";
fm.SettingsUpload.ValidationSettings.DisableHttpHandlerValidation = true;
Page.Form.Controls.Add(fm);
...
fm.Settings.RootFolder = Url.Content("~/Content/FileManager/Files");
fm.Settings.ThumbnailFolder = Url.Content("~/Content/FileManager/Thumbnails");
fm.Settings.InitialFolder = Url.Content("~/Content/FileManager/Images");
fm.Settings.AllowedFileExtensions=new String[] { ".jpeg", ".jpg", ".gif", ".png" };
MVC:
@Html.DevExpress().FileManager( settings => {
settings.Name = "fileManager";
settings.Settings.ThumbnailFolder = Url.Content("~/Content/FileManager/Thumbnails");
settings.Settings.RootFolder = Url.Content("~/Content/FileManager/Files");
settings.Settings.InitialFolder = "~/Content/FileManager/Images";
settings.Settings.AllowedFileExtensions= new String[] { ".jpeg", ".jpg", ".gif", ".png" };
...
}).BindToFolder(Model).GetHtml()