BackgroundTaskBuilder.SetTaskEntryPointClsid(Guid) Method

Definition

Namespace:

Windows.ApplicationModel.Background

Assigns a COM CLSID entry point using an existing BackgroundTaskBuilder object.

public:
 virtual void SetTaskEntryPointClsid(Platform::Guid TaskEntryPoint) = SetTaskEntryPointClsid;

void SetTaskEntryPointClsid(winrt::guid const& TaskEntryPoint);

public void SetTaskEntryPointClsid(Guid TaskEntryPoint);

function setTaskEntryPointClsid(TaskEntryPoint)

Public Sub SetTaskEntryPointClsid (TaskEntryPoint As Guid)

Parameters

TaskEntryPoint

Guid

Platform::Guid

winrt::guid

The name of the application-defined TaskEntryPoint class.

Windows requirements

Device family	Windows 10, version 2004 (introduced in 10.0.19041.0)
API contract	Windows.Foundation.UniversalApiContract (introduced in v10.0)

Examples

The following code sample demonstrates the use of BackgroundTaskBuilder to register the created WinMain COM background task to a time trigger on a 15-minute interval.

The sample code avoids creating duplicate tasks by checking if a background task with a particular task name is already registered. This is done in sample code since the intent is that only one particular background task registration exists.

It is up to the app developer to create one or multiple background tasks with the same entry point (or trigger or name).

 using System;
 using Windows.ApplicationModel.Background;

 public IBackgroundTaskRegistration RegisterBackgroundTaskWithSystem(IBackgroundTrigger trigger, Guid entryPointClsid, string taskName)
 {
     foreach (var registrationIterator in BackgroundTaskRegistration.AllTasks)
     {
         if (registrationIterator.Value.Name == taskName)
         {
             return registrationIterator.Value;
         }
     }

     BackgroundTaskBuilder builder = new BackgroundTaskBuilder();

     builder.SetTrigger(trigger);
     builder.SetTaskEntryPointClsid(entryPointClsid);
     builder.Name = taskName;

     BackgroundTaskRegistration registration;
     try
     {
         registration = builder.Register();
     }
     catch (Exception)
     {
         registration = null;
     }

     return registration;
 }

 RegisterBackgroundTaskWithSystem(new TimeTrigger(15, false), typeof(TimeTriggeredTask).GUID, typeof(TimeTriggeredTask).Name);

Remarks

For classic COM CLSID activations, the CLSID to activate is specified via SetTaskEntryPointClsid method during registration. The COM registration must identify an out-of-process COM server (i.e. LocalServer32).

See also

• TaskEntryPoint