ArcGIS Pro 2.8 API Reference Guide
GalleryItem Class
Members 

ArcGIS.Desktop.Framework.Contracts Namespace : GalleryItem Class
Represents a selectable item in a Gallery.
Syntax
public class GalleryItem : IGalleryItem  
Public Class GalleryItem 
   Implements IGalleryItem 
Remarks

The default item template for Galleries expects GalleryItems. If you're using a custom item template you can fill the gallery with whatever type is appropriate.

Inheritance Hierarchy

System.Object
   ArcGIS.Desktop.Framework.Contracts.GalleryItem

Requirements

Target Platforms: Windows 10, Windows 8.1

See Also

Reference

GalleryItem Members
ArcGIS.Desktop.Framework.Contracts Namespace