CodeActivity.CacheMetadata Method

Definition

Namespace:

System.Activities

Assembly:

System.Activities.dll

Creates and validates a description of the activity's arguments, variables, child activities, and activity delegates.

Overloads

CacheMetadata(ActivityMetadata)	Not implemented. Use CacheMetadata(CodeActivityMetadata) instead.
CacheMetadata(CodeActivityMetadata)	Creates and validates a description of the activity's arguments, variables, child activities, and activity delegates.

Remarks

Custom activity authors can provide validation logic in an activity's CacheMetadata override. Any exceptions that are thrown from CacheMetadata are not treated as validation errors. These exceptions will escape from the call to Validate and must be handled by the caller.

CacheMetadata(ActivityMetadata)

Not implemented. Use CacheMetadata(CodeActivityMetadata) instead.

C#

protected override sealed void CacheMetadata(System.Activities.ActivityMetadata metadata);

Parameters

metadata

ActivityMetadata

Not implemented.

Remarks

Custom activity authors can provide validation logic in an activity's CacheMetadata override. Any exceptions that are thrown from CacheMetadata are not treated as validation errors. These exceptions will escape from the call to Validate and must be handled by the caller.

CacheMetadata(CodeActivityMetadata)

Creates and validates a description of the activity's arguments, variables, child activities, and activity delegates.

C#

protected virtual void CacheMetadata(System.Activities.CodeActivityMetadata metadata);

Parameters

metadata

CodeActivityMetadata

The activity's metadata that encapsulates the activity's arguments, variables, child activities, and activity delegates.

Remarks

The workflow runtime uses the default implementation of CacheMetadata to ensure correct construction of a workflow as well as to manage runtime relationships and lifetime rules. The default implementation of CacheMetadata examines the public members of the activity type using the type's TypeDescriptor. These public members are of type Argument, Variable, IEnumerable<Variable>, Activity, IEnumerable<Activity>, or ActivityDelegate. You can override this method to customize the building of the activity's run-time description and to provide custom validation logic. Any exceptions that are thrown from CacheMetadata are not treated as validation errors. These exceptions will escape from the call to Validate and must be handled by the caller.