ASPxFileManager.CustomThumbnail Event

Occurs each time before a thumbnail or a folder’s icon is created.

Namespace: DevExpress.Web

Assembly: DevExpress.Web.v18.2.dll

Declaration

C#

public event FileManagerThumbnailCreateEventHandler CustomThumbnail

VB.NET

Public Event CustomThumbnail As FileManagerThumbnailCreateEventHandler

Event Data

The CustomThumbnail event's data class is FileManagerThumbnailCreateEventArgs. The following properties provide information specific to this event:

Property	Description
File	Obsolete. Gets a file related to the event.
IsParentFolder	Gets a value specifying whether the currently processed item is a parent folder.
Item	Gets an item related to the event.
ThumbnailImage	Gets the settings of a thumbnail image.

Remarks

The CustomThumbnail event enables you to provide a custom thumbnail. Within the event’s handler, the currently processed item can be accessed by using the FileManagerThumbnailCreateEventArgs.Item property. If the parent folder is processed, the FileManagerThumbnailCreateEventArgs.IsParentFolder property returns true. To specify a custom thumbnail for the processed item, use the FileManagerThumbnailCreateEventArgs.ThumbnailImage property.

Concept

Thumbnails

Example

ASPX

<dx:ASPxFileManager ID="fileManager" runat="server" OnCustomThumbnail="fileManager_CustomThumbnail">
    ...
</dx:ASPxFileManager>

C#

public void fileManager_CustomThumbnail(object sender, FileManagerThumbnailCreateEventArgs e) {
    switch(((FileManagerFile)e.Item).Extension) {
        case ".avi":
            e.ThumbnailImage.Url = "Images/movie.png";
            break;
        case ".txt":
            e.ThumbnailImage.Url = "Images/txt.png";
            break;
        case ".mp3":
            e.ThumbnailImage.Url = "Images/music.png";
            break;
        case ".xml":
            e.ThumbnailImage.Url = "Images/code.png";
            break;
    }
}

Online Demo

ASPxFileManager - Custom Thumbnail