DeletingRule Class

Represents a rule that is called when an element is about to be deleted in the model.

Inheritance Hierarchy

System.Object
  Microsoft.VisualStudio.Modeling.Rule
    Microsoft.VisualStudio.Modeling.DeletingRule

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

Syntax

'宣言
Public MustInherit Class DeletingRule _
    Inherits Rule

public abstract class DeletingRule : Rule

public ref class DeletingRule abstract : public Rule

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

public abstract class DeletingRule extends Rule

The DeletingRule type exposes the following members.

Constructors

	Name	Description
	DeletingRule

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Properties

	Name	Description
	FireBefore	Override the FireBefore flag to always return true (Overrides Rule.FireBefore.)
	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.)

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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.)
	ElementDeleting	public virtual method for the client to have his own user-defined delete rule class
	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.)

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Remarks

Rules of this type are triggered when an element is about to be deleted from the store.

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.

The rule is called when the object of the specified type is about to be deleted from the model, whether it is deleted in the UI or programmatically.

A DeletingRule is always executed before a DeleteRuledefined on the same object. Typically, all the deleting rules generated by a transaction are executed, and then all the deleted rules.

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