ArcGIS Pro 3.4 API Reference Guide
ArcGIS.Desktop.TaskAssistant Namespace / TaskProjectItem Class / IsOpen Property
Example Version

IsOpen Property
Gets the open flag of the task item (ie is the task item open in the Tasks pane).
Syntax
public bool IsOpen {get;}
Example
Close a Task Item
// find the first project task item which is open
var taskItem = Project.Current.GetItems<TaskProjectItem>().FirstOrDefault(t => t.IsOpen == true);
// if there isn't a project task item, return
if (taskItem == null)
  return;

if (taskItem.IsOpen)
{
  // close it
  // NOTE : The task item will also be removed from the project
  //At 2.x -
  //TaskAssistantModule.CloseTaskAsync(taskItem.TaskItemGuid);
  TaskAssistantFactory.Instance.CloseTaskItemAsync(taskItem.TaskItemGuid);
}
Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3 or higher.
See Also