Task registration seems to succeed but the tasks do not launch and have somehow corrupted the Task Scheduler as follows:
The error dialog box in the image pops up six times which is how many tasks my app deleted then recreated. This happens when the Task Scheduler MMC Console if first launched and also when the House of Synergy folder is selected.
The code is a bit lengthy but necessary and ready to compile:
```
namespace TaskSchedulerHelper
{
using System;
using System.Diagnostics;
using System.Linq;
using System.Security.Principal;
using System.Windows.Forms;
using Microsoft.Win32.TaskScheduler;
internal static class Program
{
[STAThread]
private static void Main (string [] args)
{
var now = DateTime.Now;
var folderName = @"House of Synergy";
var taskNamePrefix = @"ShutDown Power Outage";
var applicationName = @"Task Scheduler Helper";
var times = new TimeSpan []
{
TimeSpan.FromHours(02), // 02:00 AM
TimeSpan.FromHours(06), // 06:00 AM
TimeSpan.FromHours(11), // 11:00 AM
TimeSpan.FromHours(15), // 03:00 PM
TimeSpan.FromHours(19), // 07:00 PM
TimeSpan.FromHours(23), // 11:00 PM
};
try
{
Console.Title = applicationName;
Console.WriteLine(applicationName);
Console.WriteLine();
// Uses the Task Scheduler Managed Wrapper
// from https://taskscheduler.codeplex.com/.
// Release: 2.3.0. Status: Stable.
// Date: Thu Dec 18, 2014 at 12:00 PM.
using (TaskService service = new TaskService())
{
var folder = service
.RootFolder
.SubFolders
.FirstOrDefault(f => (string.Compare(f.Name, folderName, StringComparison.InvariantCultureIgnoreCase) == 0));
if (folder == null) { folder = service.RootFolder.CreateFolder(folderName); }
var tasks = folder
.Tasks
//.Where(t => t.Name.StartsWith(taskNamePrefix, StringComparison.InvariantCultureIgnoreCase))
.ToList();
if (tasks.Any())
{
// Delete existing tasks.
Console.WriteLine("Deleting existing tasks.");
foreach (var task in tasks)
{
Console.Write(" - Deleting Task: {0}: ", task.Name);
try
{
task.Stop();
//task.Enabled = false; // Throws ComException: Element not found. (Exception from HRESULT: 0x80070490).
//Console.WriteLine(task.State); // Throws ComException: Element not found. (Exception from HRESULT: 0x80070490).
task.RegisterChanges();
folder.DeleteTask(task.Name, false);
task.Dispose();
Console.WriteLine("Done.");
}
catch (Exception exception)
{
Console.WriteLine("Exception: {0}.", exception);
}
}
}
Console.WriteLine();
Console.WriteLine("Creating new Tasks.");
foreach (var time in times)
{
var dateTimeNow = now.Date;
var definition = service.NewTask();
var dateTimeTrigger = now.Date.Add(time);
var taskName = taskNamePrefix + " " + dateTimeTrigger.ToString(@"hh-mm tt");
Console.Write(" - Creating Task: {0}: ", taskName);
try
{
definition.RegistrationInfo.Author = WindowsIdentity.GetCurrent().Name;
definition.RegistrationInfo.Date = DateTime.Now;
definition.RegistrationInfo.Description = "ShutDown event due to power outage at [" + dateTimeTrigger.ToLongTimeString() + "].";
definition.RegistrationInfo.Source = applicationName;
definition.RegistrationInfo.Version = new Version(1, 0, 0, 0);
definition.Settings.AllowDemandStart = true;
definition.Settings.AllowHardTerminate = false;
definition.Settings.Compatibility = TaskCompatibility.V2_1; // Windows 7 and above.
definition.Settings.DisallowStartIfOnBatteries = false;
definition.Settings.DisallowStartOnRemoteAppSession = false;
definition.Settings.Enabled = true;
definition.Settings.Hidden = false;
definition.Settings.MultipleInstances = TaskInstancesPolicy.IgnoreNew;
definition.Settings.Priority = ProcessPriorityClass.High;
definition.Settings.RestartCount = 10;
definition.Settings.RestartInterval = TimeSpan.FromMinutes(1);
definition.Settings.RunOnlyIfIdle = false;
definition.Settings.RunOnlyIfNetworkAvailable = false;
definition.Settings.StartWhenAvailable = true;
definition.Settings.StopIfGoingOnBatteries = false;
definition.Settings.UseUnifiedSchedulingEngine = true;
definition.Settings.WakeToRun = false;
definition.Actions.Add(new ShowMessageAction("Message Body", "Message Title"));
definition.Triggers.Add(new DailyTrigger() { StartBoundary = dateTimeTrigger.Subtract(TimeSpan.FromMinutes(10)), });
var task = folder.RegisterTaskDefinition(taskName, definition);
task.Enabled = true;
task.RegisterChanges();
// Always succeeds.
Console.WriteLine("Done.");
try
{
Console.WriteLine(" - Task Validation: ", task.Definition.Validate(throwException : true) ? "Succeeded." : "Failed.");
}
catch (Exception exception)
{
// Validation always fails.
Console.WriteLine(" - Task Validation Exception: {0}.", exception);
}
}
catch (Exception exception)
{
Console.WriteLine("Exception: {0}.", exception.Message);
}
}
}
}
catch (Exception exception)
{
Console.Write(exception);
}
Console.WriteLine();
Console.WriteLine();
Console.Write("Press any key to continue...");
Console.ReadKey(true);
}
}
}
```
Comments: ** Comment from web user: dahall **
Try this. It incorporates the changes I suggested above. Also, the validation is failing because you have set UseUnifiedSchedulingEngine = true. Unless you must use this, I'd suggest setting it to false as it could cause problems with later versions of Windows.
```
var now = DateTime.Now;
var folderName = @"House of Synergy";
var taskNamePrefix = @"ShutDown Power Outage";
var applicationName = @"Task Scheduler Helper";
var times = new TimeSpan[]
{
TimeSpan.FromHours(02), // 02:00 AM
TimeSpan.FromHours(06), // 06:00 AM
TimeSpan.FromHours(11), // 11:00 AM
TimeSpan.FromHours(15), // 03:00 PM
TimeSpan.FromHours(19), // 07:00 PM
TimeSpan.FromHours(23), // 11:00 PM
};
try
{
Console.Title = applicationName;
Console.WriteLine(applicationName);
Console.WriteLine();
// Uses the Task Scheduler Managed Wrapper
// from https://taskscheduler.codeplex.com/.
// Release: 2.3.0. Status: Stable.
// Date: Thu Dec 18, 2014 at 12:00 PM.
using (TaskService service = new TaskService())
{
TaskFolder folder;
if (service.RootFolder.SubFolders.Exists(folderName))
folder = service.RootFolder.SubFolders[folderName];
else
folder = service.RootFolder.CreateFolder(folderName);
var tasks = folder.GetTasks(new Wildcard(taskNamePrefix + "*"));
if (tasks.Count > 0)
{
// Delete existing tasks.
Console.WriteLine("Deleting existing tasks.");
foreach (var task in tasks)
{
Console.Write(" - Deleting Task: {0}: ", task.Name);
try
{
task.Stop();
folder.DeleteTask(task.Name, false);
// CHANGE: don't dispose of task, they all auto-dispose at the right time
Console.WriteLine("Done.");
}
catch (Exception exception)
{
Console.WriteLine("Exception: {0}.", exception);
}
}
}
Console.WriteLine();
Console.WriteLine("Creating new Tasks.");
foreach (var time in times)
{
var dateTimeNow = now.Date;
var definition = service.NewTask();
var dateTimeTrigger = now.Date.Add(time);
var taskName = taskNamePrefix + " " + dateTimeTrigger.ToString(@"hh-mm tt");
Console.Write(" - Creating Task: {0}: ", taskName);
try
{
definition.RegistrationInfo.Author = System.Security.Principal.WindowsIdentity.GetCurrent().Name;
definition.RegistrationInfo.Date = DateTime.Now;
definition.RegistrationInfo.Description = "ShutDown event due to power outage at [" + dateTimeTrigger.ToLongTimeString() + "].";
definition.RegistrationInfo.Source = applicationName;
definition.RegistrationInfo.Version = new Version(1, 0, 0, 0);
definition.Settings.AllowDemandStart = true;
definition.Settings.AllowHardTerminate = false;
definition.Settings.Compatibility = TaskCompatibility.V2_1; // Windows 7 and above.
definition.Settings.DisallowStartIfOnBatteries = false;
definition.Settings.DisallowStartOnRemoteAppSession = false;
definition.Settings.Enabled = true;
definition.Settings.Hidden = false;
definition.Settings.MultipleInstances = TaskInstancesPolicy.IgnoreNew;
definition.Settings.Priority = System.Diagnostics.ProcessPriorityClass.High;
definition.Settings.RestartCount = 10;
definition.Settings.RestartInterval = TimeSpan.FromMinutes(1);
definition.Settings.RunOnlyIfIdle = false;
definition.Settings.RunOnlyIfNetworkAvailable = false;
definition.Settings.StartWhenAvailable = true;
definition.Settings.StopIfGoingOnBatteries = false;
definition.Settings.UseUnifiedSchedulingEngine = true;
definition.Settings.WakeToRun = false;
definition.Actions.Add(new ShowMessageAction("Message Body", "Message Title"));
definition.Triggers.Add(new DailyTrigger() { StartBoundary = dateTimeTrigger.Subtract(TimeSpan.FromMinutes(10)), });
var task = folder.RegisterTaskDefinition(taskName, definition);
// CHANGE: Don't need to enable or re-register, you just did that.
// Always succeeds.
Console.WriteLine("Done.");
try
{
Console.WriteLine(" - Task Validation: ", task.Definition.Validate(throwException: true) ? "Succeeded." : "Failed.");
}
catch (Exception exception)
{
// Validation always fails.
Console.WriteLine(" - Task Validation Exception: {0}.", exception);
}
}
catch (Exception exception)
{
Console.WriteLine("Exception: {0}.", exception.Message);
}
}
}
}
catch (Exception exception)
{
Console.Write(exception);
}
Console.WriteLine();
Console.WriteLine();
Console.Write("Press any key to continue...");
Console.ReadKey(true);
```