ArcGIS Pro 3.4 API Reference Guide
ArcGIS.Desktop.Mapping Namespace / TableView Class / SelectAll Method
Example Version

SelectAll Method (TableView)
Selects all the rows in the table view.
Syntax
public void SelectAll()
Example
Select all rows
var tv = TableView.Active;
if (tv == null)
  return;

if (tv.CanSelectAll)
  tv.SelectAll();
Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3.1 or higher.
See Also