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If Class
Visual Studio 2010
Models an If-Then-Else condition.
System::Object
System.Activities::Activity
System.Activities::NativeActivity
System.Activities.Statements::If
System.Activities::Activity
System.Activities::NativeActivity
System.Activities.Statements::If
Assembly: System.Activities (in System.Activities.dll)
The If type exposes the following members.
| Name | Description | |
|---|---|---|
![]() | If() | Creates a new instance of the If class. |
![]() | If(Activity<Boolean>) | Creates a new instance of the If class using the specified condition. |
![]() | If(InArgument<Boolean>) | Creates a new instance of the If class using the specified condition. |
![]() | If(Expression<Func<ActivityContext, Boolean>>) | Creates a new instance of the If class using the specified condition. |
| Name | Description | |
|---|---|---|
![]() | CacheId | Gets the identifier of the cache that is unique within the scope of the workflow definition. (Inherited from Activity.) |
![]() | CanInduceIdle | Gets or sets a value that indicates whether the activity can cause the workflow to become idle. (Inherited from NativeActivity.) |
![]() | Condition | The condition that determines which child activity to execute. The Then activity executes if the condition resolves to true. The Else activity executes if the condition resolves to false. |
![]() | Constraints | Gets a collection of Constraint activities that can be configured to provide validation for the Activity. (Inherited from Activity.) |
![]() | DisplayName | Gets or sets an optional friendly name that is used for debugging, validation, exception handling, and tracking. (Inherited from Activity.) |
![]() | Else | The activity to be executed if the activity’s Condition resolves to false. |
![]() | Id | Gets an identifier that is unique in the scope of the workflow definition. (Inherited from Activity.) |
![]() | Implementation | The execution logic of the activity. (Inherited from NativeActivity.) |
![]() | Then | The activity to be executed if the activity’s Condition resolves to true. |
| Name | Description | |
|---|---|---|
![]() | Abort | When implemented in a derived class, takes actions in response to the activity being aborted. (Inherited from NativeActivity.) |
![]() | CacheMetadata(ActivityMetadata) | Not implemented. Use the CacheMetadata(NativeActivityMetadata) method instead. (Inherited from NativeActivity.) |
![]() | CacheMetadata(NativeActivityMetadata) | Creates and validates a description of the activity’s arguments, variables, child activities, and activity delegates. (Inherited from NativeActivity.) |
![]() | Cancel | When implemented in a derived class, runs logic to cause graceful early completion of the activity. (Inherited from NativeActivity.) |
![]() | Equals(Object) | Determines whether the specified Object is equal to the current Object. (Inherited from Object.) |
![]() | Execute | When implemented in a derived class, runs the activity’s execution logic. (Inherited from NativeActivity.) |
![]() | 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 | Serves as a hash function for a particular type. (Inherited from Object.) |
![]() | GetType | Gets the Type of the current instance. (Inherited from Object.) |
![]() | MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
![]() | ShouldSerializeDisplayName | Indicates whether the DisplayName property should be serialized. (Inherited from Activity.) |
![]() | ToString | Returns a String that contains the Id and DisplayName of the Activity. (Inherited from Activity.) |
The following code sample demonstrates creating an If activity. This example is from the Sending and Handling Faults sample.
new If { // check if the order is asking for Widgets Condition = new InArgument<bool>( (e) => po.Get(e).PartName.Equals("Widget") ), Then = new If { // check if we have enough widgets in stock Condition = new InArgument<bool>( (e) => po.Get(e).Quantity < 100 ), Then = new SendReply { DisplayName = "Successful response", Request = submitPO, Content = SendContent.Create(new InArgument<string>( (e) => string.Format("Success: {0} Widgets have been ordered!", po.Get(e).Quantity)) ) }, // if we don't have enough widgets, throw an unhandled exception from this operation's body Else = new Throw { Exception = new InArgument<Exception>((e) => new Exception("We don't have that many Widgets.")) } }, // if its not for widgets, reply to the client that we don't carry that part by sending back an expected fault type (POFault) Else = new SendReply { DisplayName = "Expected fault", Request = submitPO, Content = SendContent.Create(new InArgument<FaultException<POFault>>( (e) => new FaultException<POFault>( new POFault { Problem = string.Format("This company does not carry {0}s, but we do carry Widgets.", po.Get(e).PartName), Solution = "Try your local hardware store." }, new FaultReason("This is an expected fault.") ))) } }
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.
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