InvokeOperation<TValue> Class

  • Article

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

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Methods

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

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Events

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

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Explicit Interface Implementations

  Name Description
Explicit interface implemetationPrivate event 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.

See Also

Reference

System.ServiceModel.DomainServices.Client Namespace