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Handle Class

Represents a type that has its lifetime controlled by the workflow runtime.

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

public abstract class Handle

The Handle type exposes the following members.

Protected methodHandleInitializes a new instance of the Handle class.

Public propertyExecutionPropertyNameGets the name to be used by this Handle when added to an activity’s execution properties.
Public propertyOwnerGets the ActivityInstance that contains the Variable that contains the Handle.

Public methodEquals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Protected methodOnInitializeCalled by the workflow runtime when the environment that contains the Handle is initialized.
Protected methodOnUninitializeCalled by the workflow runtime when the Variable for the Handle goes out of scope.
Protected methodThrowIfUninitializedThrows an InvalidOperationException if the Handle has not been initialized.
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)

Types derived from Handle have their lifetimes controlled by the workflow runtime. For workflow variables of handle types, the runtime uses the required default constructor to create an instance of the type, assigns it to the Variable, and calls OnInitialize(HandleInitializationContext) when initializing the environment. When the variable goes out of scope, OnUninitialize(HandleInitializationContext) is called.

.NET Framework

Supported in: 4

.NET Framework Client Profile

Supported in: 4

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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

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