ArcGIS Pro 2.6 API Reference Guide
OpenItemDialog Class
Members 

ArcGIS.Desktop.Catalog Namespace : OpenItemDialog Class
Opens the Browse dialog box and allows you to select one or more project items, portal items, or items available from a local or network disk
Object Model
OpenItemDialog ClassBrowseProjectFilter Class
Syntax
public sealed class OpenItemDialog : ItemDialog 
Public NotInheritable Class OpenItemDialog 
   Inherits ItemDialog
Inheritance Hierarchy

System.Object
   ArcGIS.Desktop.Catalog.ItemDialog
      ArcGIS.Desktop.Catalog.OpenItemDialog

Requirements

Target Platforms: Windows 10, Windows 8.1, Windows 7

See Also

Reference

OpenItemDialog Members
ArcGIS.Desktop.Catalog Namespace