InvokeOperation<TValue> Class

Article
01/27/2012

[WCF RIA Services Version 1 Service Pack 2 is compatible with either .NET framework 4 or .NET Framework 4.5, and with either Silverlight 4 or Silverlight 5.]

Represents an asynchronous invoke operation.

Inheritance Hierarchy

System.Object
  System.ServiceModel.DomainServices.Client.OperationBase
    System.ServiceModel.DomainServices.Client.InvokeOperation
      System.ServiceModel.DomainServices.Client.InvokeOperation<TValue>

Namespace: System.ServiceModel.DomainServices.Client
Assembly: System.ServiceModel.DomainServices.Client (in System.ServiceModel.DomainServices.Client.dll)

Syntax

'Declaration
Public NotInheritable Class InvokeOperation(Of TValue) _
    Inherits InvokeOperation

'Usage
Dim instance As InvokeOperation(Of TValue)

public sealed class InvokeOperation<TValue> : InvokeOperation

generic<typename TValue>
public ref class InvokeOperation sealed : public InvokeOperation

[<SealedAttribute>]
type InvokeOperation<'TValue> =  
    class
        inherit InvokeOperation
    end

JScript does not support generic types and methods.

Type Parameters

TValue
The type of return value for the invoke operation.

The InvokeOperation<TValue> type exposes the following members.

Properties

	Name	Description
	CanCancel	Gets a value that indicates whether this OperationBase is currently in a state that enables it to be canceled. (Inherited from OperationBase.)
	Error	Gets the operation error if the operation failed. (Inherited from OperationBase.)
	HasError	Gets a value that indicates whether the operation failed. (Inherited from OperationBase.)
	IsCanceled	Gets a value that indicates whether this operation has been canceled. (Inherited from OperationBase.)
	IsComplete	Gets a value that indicates whether this operation has completed. (Inherited from OperationBase.)
	IsErrorHandled	Gets or sets a value that indicates whether the operation error has been handled. (Inherited from OperationBase.)
	OperationName	Gets the name of the operation. (Inherited from InvokeOperation.)
	Parameters	Gets the collection of parameters to the operation. (Inherited from InvokeOperation.)
	Result	Gets the DomainClientResult for this operation. (Inherited from InvokeOperation.)
	SupportsCancellation	Gets a value indicating whether this operation supports cancellation. (Inherited from InvokeOperation.)
	UserState	Gets the optional user state for this operation. (Inherited from OperationBase.)
	ValidationErrors	Gets the validation errors for this operation. (Inherited from InvokeOperation.)
	Value	Gets the return value for the invoke operation.

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Methods

	Name	Description
	Cancel	Cancels the operation. (Inherited from OperationBase.)
	CancelCore	Invokes the cancel callback. (Inherited from InvokeOperation.)
	Complete(Exception)	Completes a failed operation with the specified error. (Inherited from OperationBase.)
	Complete(Object)	Completes a successful operation with the specified result. (Inherited from OperationBase.)
	Equals	(Inherited from Object.)
	Finalize	(Inherited from Object.)
	GetHashCode	(Inherited from Object.)
	GetType	(Inherited from Object.)
	InvokeCompleteAction	Invokes the completion callback. (Inherited from InvokeOperation.)
	MarkErrorAsHandled	Specifies that an error encountered in an operation is handled. (Inherited from OperationBase.)
	MemberwiseClone	(Inherited from Object.)
	OnPropertyChanged	Called when the value of a property changes. (Inherited from OperationBase.)
	RaisePropertyChanged	Raises the System#ComponentModel#INotifyPropertyChanged#PropertyChanged() event. (Inherited from OperationBase.)
	ToString	(Inherited from Object.)

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Events

	Name	Description
	Completed	Occurs when the operation completes. (Inherited from OperationBase.)

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Explicit Interface Implementations

	Name	Description
	INotifyPropertyChanged.PropertyChanged	Occurs when a property value changes. (Inherited from OperationBase.)

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Examples

<EnableClientAccess()>
Public Class CustomerDomainService
    Inherits LinqToEntitiesDomainService(Of AdventureWorksLTEntities)

    <Invoke()>
    Public Function CountCustomers() As Integer
        Return Me.ObjectContext.Customers.Count()
    End Function

End Class

[EnableClientAccess()]
public class CustomerDomainService : LinqToEntitiesDomainService<AdventureWorksLTEntities>
{
    [Invoke]
    public int CountCustomers()
    {
        return this.ObjectContext.Customers.Count();
    }
}

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.

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