DeleteRule Class

Represents a rule that is called when an object is deleted from the model. Executes after the corresponding DeletingRule.

Inheritance Hierarchy

System.Object
  Microsoft.VisualStudio.Modeling.Rule
    Microsoft.VisualStudio.Modeling.DeleteRule
      Microsoft.VisualStudio.Modeling.Diagrams.DiagramDeleteRule
      Microsoft.VisualStudio.Modeling.Diagrams.ParentShapeContainsNestedChildShapesDeleteRule
      Microsoft.VisualStudio.Modeling.Diagrams.ParentShapeHasRelativeChildShapesDeleteRule

Namespace:  Microsoft.VisualStudio.Modeling
Assembly:  Microsoft.VisualStudio.Modeling.Sdk.10.0 (in Microsoft.VisualStudio.Modeling.Sdk.10.0.dll)

Syntax

'宣告
Public MustInherit Class DeleteRule _
    Inherits Rule

public abstract class DeleteRule : Rule

public ref class DeleteRule abstract : public Rule

[<AbstractClass>]
type DeleteRule =  
    class
        inherit Rule
    end

public abstract class DeleteRule extends Rule

The DeleteRule type exposes the following members.

Constructors

	Name	Description
	DeleteRule	Initializes a new instance of the DeleteRule class.

Top

Properties

	Name	Description
	FireBefore	true if this rule will be executed before the change occurs. (Inherited from Rule.)
	FireImmediately	true if this rule will execute immediately the change occurs. (Inherited from Rule.)
	FireOnLocalCommit	true if this rule will execute when the current transaction commits. (Inherited from Rule.)
	FireOnTopLevelCommit	true if this rule will execute when the top level transaction commits. (Inherited from Rule.)
	FireTime	Gets or sets when the rule should execute. Normally set by the RuleOn attribute. (Inherited from Rule.)
	IsEnabled	Gets or sets whether the rule is enabled. Normally true by default, but you can initialize it to false in the RuleOn attribute. (Inherited from Rule.)
	Priority	Gets the priority that is assigned to the rule. Helps to determine the order in which rules are executed at the end of a transaction. (Inherited from Rule.)

Top

Methods

	Name	Description
	CompareTo(Object)	Compares the rule to another object. (Inherited from Rule.)
	CompareTo(Rule)	Compares the rule to another rule by their IDs. (Inherited from Rule.)
	ElementDeleted	Alerts listeners that an element has been deleted from the model.
	Equals(Object)	Verifies whether the rule is equal to another object. (Inherited from Rule.)
	Equals(Rule)	Verifies whether a rule is equal to another rule. (Inherited from Rule.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
	GetHashCode	Gets the hash code for the rule. (Inherited from Rule.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	ToString	Returns a string that represents the current object. (Inherited from Object.)

Top

Remarks

Rules of this type are triggered when an object is deleted from the model.

Before defining a Delete Rule, consider whether you can achieve the same effect using the features available in the DSL Definition. For more information, see Customizing Deletion Behavior

A RuleOnAttribute attribute placed on the class indicates what type of object the rule works on and when the rule should fire (inline, local transaction commit, or top level transaction commit).

The rule is executed when the object of the specified type is deleted from the model, whether it is deleted in the UI or programmatically. It is always executed after a DeletingRule defined on the same object. Typically, all the deleting rules generated by a transaction are executed, and then all the deleted rules.

If you want to delete further objects in response to an object’s deletion, do so in a DeletingRule, not a DeleteRule.

After the DeleteRule is triggered, the IsDeleted property of the element is true. The element is removed from the store’s element directory.

For more information and examples, see Rules Propagate Changes Within the Model.

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

See Also

Reference

Microsoft.VisualStudio.Modeling Namespace

Other Resources

Rules Propagate Changes Within the Model