TileView.GetThumbnailImage Event

Occurs whenever a tile within this TileView needs to load its background image asynchronously and allows you to manually pass the desired image.

Namespace: DevExpress.XtraGrid.Views.Tile

Assembly: DevExpress.XtraGrid.v23.2.dll

NuGet Packages: DevExpress.Win.Grid, DevExpress.Win.Navigation

Declaration

C#

[DXCategory("Data")]
public event ThumbnailImageEventHandler GetThumbnailImage

VB.NET

<DXCategory("Data")>
Public Event GetThumbnailImage As ThumbnailImageEventHandler

Event Data

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

Property	Description
DataSourceIndex	Gets the index of the currently processed item among other items in the source (the item’s index in the bound data source for data-aware controls, e.g., GridControl).
DesiredThumbnailSize	Stores the desired size of thumbnail images, generated using the ThumbnailImageEventArgs.CreateThumbnailImage method.
ThumbnailImage	Gets or sets the image that will be assigned to an item that fired this event.

The event data class exposes the following methods:

Method	Description
CreateThumbnailImage(Image, Size)	Creates a thumbnail image of the specific size. This image will be later assigned to an item that supports the asynchronous image load feature.
CreateThumbnailImage(Image)	Creates a thumbnail image that will be assigned to an item that supports the asynchronous image load feature.
ResetImageCache()	Resets the image cache and causes all items that are not currently visible to reload their images when displayed again.

Remarks

See the TileView.OptionsImageLoad property to learn more.

Important

The GetThumbnailImage event is raised from a non-UI thread.

Related GitHub Examples

The following code snippet (auto-collected from DevExpress Examples) contains a reference to the GetThumbnailImage event.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

C#

winforms-grid-tileview-thumbnails-async-load/CS/TileView-ManualThumbs/Form1.cs#L26

tileView1.OptionsTiles.ItemSize = new Size(90, 40);
tileView1.GetThumbnailImage += TileView1_GetThumbnailImage;
// Specify a column that provides information on images to render.

VB.NET

winforms-grid-tileview-thumbnails-async-load/VB/TileView-ManualThumbs/Form1.vb#L23

tileView1.OptionsTiles.ItemSize = New Size(90, 40)
AddHandler tileView1.GetThumbnailImage, AddressOf TileView1_GetThumbnailImage
' Specify a column that provides information on images to render.