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Constraint Class

Handles the validation constraint that is used for validating an activity.

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

public abstract class Constraint : NativeActivity

The Constraint type exposes the following members.

  NameDescription
Protected propertyCacheIdGets the identifier of the cache that is unique within the scope of the workflow definition. (Inherited from Activity.)
Protected propertyCanInduceIdleGets or sets a value that indicates whether the activity can cause the workflow to become idle. (Inherited from NativeActivity.)
Protected propertyConstraintsGets a collection of Constraint activities that can be configured to provide validation for the Activity. (Inherited from Activity.)
Public propertyDisplayNameGets or sets an optional friendly name that is used for debugging, validation, exception handling, and tracking. (Inherited from Activity.)
Public propertyIdGets an identifier that is unique in the scope of the workflow definition. (Inherited from Activity.)
Protected propertyImplementationThe execution logic of the activity. (Inherited from NativeActivity.)
Protected propertyImplementationVersionGets or sets the implementation version of the activity. (Inherited from NativeActivity.)
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  NameDescription
Protected methodAbortWhen implemented in a derived class, takes actions in response to the activity being aborted. (Inherited from NativeActivity.)
Public methodStatic memberAddValidationErrorAdds a validation error to a list of run-time validation errors that are attached to the execution context.
Protected methodCacheMetadata(ActivityMetadata)Not implemented. Use the CacheMetadata method instead. (Inherited from NativeActivity.)
Protected methodCacheMetadata(NativeActivityMetadata)Creates a NativeActivityMetadata object that contains runtime arguments for the workflow validation process. (Overrides NativeActivity.CacheMetadata(NativeActivityMetadata).)
Protected methodCancelWhen implemented in a derived class, runs logic to cause graceful early completion of the activity. (Inherited from NativeActivity.)
Public methodEquals(Object)Determines whether the specified object is equal to the current object. (Inherited from Object.)
Protected methodExecuteInvokes the process that validates an activity. (Overrides NativeActivity.Execute(NativeActivityContext).)
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 the default hash function. (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 methodOnCreateDynamicUpdateMap(NativeActivityUpdateMapMetadata, Activity)Raises an event when creating a map for the dynamic update. (Inherited from NativeActivity.)
Protected methodOnCreateDynamicUpdateMap(UpdateMapMetadata, Activity)Raises an event when creating a map for the dynamic update. (Inherited from NativeActivity.)
Protected methodOnExecuteWhen implemented by a derived class, validates the specified object using the specified native activity and validation contexts.
Public methodShouldSerializeDisplayNameIndicates whether the DisplayName property should be serialized. (Inherited from Activity.)
Public methodToStringReturns a String that contains the Id and DisplayName of the Activity. (Inherited from Activity.)
Protected methodUpdateInstanceUpdates the instance of NativeActivity. (Inherited from NativeActivity.)
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  NameDescription
Public fieldStatic memberValidationErrorListPropertyNameThe name for an activity constraint property that is a list of workflow run-time validation errors.
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.NET Framework

Supported in: 4.5, 4

.NET Framework Client Profile

Supported in: 4

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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.
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