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RuleInvokeAttribute Class

Indicates that a method is invoked by a condition. This class cannot be inherited.

Namespace:  System.Workflow.Activities.Rules
Assembly:  System.Workflow.Activities (in System.Workflow.Activities.dll)

[AttributeUsageAttribute(AttributeTargets.Method|AttributeTargets.Property, AllowMultiple = true)]
public sealed class RuleInvokeAttribute : RuleAttribute

This attribute is used to support a forward chaining model that will cause the reevaluation of rules based on state change. The RuleReadAttribute, RuleInvokeAttribute, and RuleWriteAttribute classes each indicate the properties used to read a condition, write an action, and invoke a method. These attributes enable the workflow to only reevaluate rules that will change the final output.

The following code example demonstrates proper usage of the RuleInvokeAttribute.


bool DoSomething()
    return attributevalue();


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

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0