ArcGIS Pro 3.4 API Reference Guide
ArcGIS.Desktop.Core Namespace / ArcGISPortal Class / IsSignedOn Method
Example Version

IsSignedOn Method (ArcGISPortal)
Gets the sign on status of the portal instance. This method should be called from within a QueuedTask or System.Threading.Task unless the caller is within ArcGIS.Desktop.Framework.Contracts.ConfigurationManager.OnApplicationInitializing in which case the main thread should be used.
Syntax
public bool IsSignedOn()

Return Value

Exceptions
ExceptionDescription
Thrown when a method is called on the wrong Pro thread
Example
ArcGISPortalManager: Get a portal and Sign In, Set it Active
//Find the portal to sign in with using its Uri...
var portal = ArcGISPortalManager.Current.GetPortal(new Uri(uri, UriKind.Absolute));
if (!portal.IsSignedOn())
{
  //Calling "SignIn" will trigger the OAuth popup if your credentials are
  //not cached (eg from a previous sign in in the session)
  if (portal.SignIn().success)
  {
    //Set this portal as my active portal
    ArcGISPortalManager.Current.SetActivePortal(portal);
  }
}
Portal: Get the Current signed in User from the active portal
var portal = ArcGISPortalManager.Current.GetActivePortal();
//Force login
if (!portal.IsSignedOn())
{
  portal.SignIn();
}
var user = portal.GetSignOnUsername();
Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3 or higher.
See Also