ServiceCreatorCallback Delegate
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ServiceCreatorCallback Delegate

 

Provides a callback mechanism that can create an instance of a service on demand.

Namespace:   System.ComponentModel.Design
Assembly:  System (in System.dll)

[ComVisibleAttribute(true)]
[HostProtectionAttribute(SecurityAction.LinkDemand, SharedState = true)]
public delegate object ServiceCreatorCallback(
	IServiceContainer container,
	Type serviceType
)

Parameters

container
Type: System.ComponentModel.Design.IServiceContainer

The service container that requested the creation of the service.

serviceType
Type: System.Type

The type of service to create.

Return Value

Type: System.Object

The service specified by serviceType, or null if the service could not be created.

ServiceCreatorCallback provides a mechanism to publish services that you can request to have created when needed, rather than the service being created immediately when the designer loads. You can use a callback function if the service is not essential and may not be used. A service published by using a ServiceCreatorCallback does not use as many additional resources if it is not requested and created. To use a callback function to publish your service, pass a ServiceCreatorCallback to the AddService method of an IServiceContainer.

The following code example shows how to publish a service using a callback function.

// The following code shows how to publish a service using a callback function.

// Creates a service creator callback.
ServiceCreatorCallback callback1 = 
new ServiceCreatorCallback(myCallBackMethod);

// Adds the service using its type and the service creator callback.
serviceContainer.AddService(typeof(myService), callback1);

.NET Framework
Available since 1.1
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