InvokeOperation Class
WCF RIA Services
[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.
System.Object
System.ServiceModel.DomainServices.Client.OperationBase
System.ServiceModel.DomainServices.Client.InvokeOperation
System.ServiceModel.DomainServices.Client.InvokeOperation(Of TValue)
System.ServiceModel.DomainServices.Client.OperationBase
System.ServiceModel.DomainServices.Client.InvokeOperation
System.ServiceModel.DomainServices.Client.InvokeOperation(Of TValue)
Namespace: System.ServiceModel.DomainServices.Client
Assembly: System.ServiceModel.DomainServices.Client (in System.ServiceModel.DomainServices.Client.dll)
The InvokeOperation type exposes the following members.
| 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. |
![]() | Parameters | Gets the collection of parameters to the operation. |
![]() | Result | Gets the DomainClientResult for this operation. |
![]() | SupportsCancellation | Gets a value indicating whether this operation supports cancellation. (Overrides OperationBase.SupportsCancellation.) |
![]() | UserState | Gets the optional user state for this operation. (Inherited from OperationBase.) |
![]() | ValidationErrors | Gets the validation errors for this operation. |
![]() | Value | Gets the return value for the invoke operation. |
| Name | Description | |
|---|---|---|
![]() | Cancel | Cancels the operation. (Inherited from OperationBase.) |
![]() | CancelCore | Invokes the cancel callback. (Overrides OperationBase.CancelCore.) |
![]() | 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. (Overrides OperationBase.InvokeCompleteAction.) |
![]() | 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.) |
| Name | Description | |
|---|---|---|
![]() ![]() | INotifyPropertyChanged.PropertyChanged | Occurs when a property value changes. (Inherited from OperationBase.) |
Partial Public Class MainPage Inherits UserControl ' Create the DomainContext for the DomainService Private _customerContext As CustomerDomainContext = New CustomerDomainContext() Friend invokeOp As InvokeOperation = New InvokeOperation() ' In this example, the value of the invoke operations is supposed to be a string Friend result As Integer Dim opEx As DomainOperationException = New DomainOperationException() Public Function MainPage() InitializeComponent() 'Set invokeOp equal to _customerContext.CountCustomers invokeOp = _customerContext.CountCustomers(OnInvokeCompleted, Nothing) Dim query As EntityQuery(Of Customer) = From c In _customerContext.GetCustomersQuery Where c.Phone.StartsWith("583") Order By c.LastName Select c Dim loadOp As LoadOperation(Of Customer) = this._customerContext.Load(query, LoadBehavior.MergeIntoCurrent, False) opEx = New DomainOperationException("Validation Error", OperationErrorStatus.ValidationFailed, 326) If loadOp.ValidationErrors <> Nothing Then Throw opEx End If Dim qr As QueryResult(Of Customer) = New QueryResult(Of Customer)() CustomerGrid.ItemsSource = qr.IncludedResults End Function 'Create a method for handling the InvokeOperations onCompleted. Private Function OnInvokeCompleted(ByVal invOp As InvokeOperation) If invOp.HasError = True Then If invOp.ValidationErrors <> Nothing Then Throw opEx Else MessageBox.Show(String.Format("An Error Occured" + vbCrLf + _ "Error Message: {0}" + vbCrLf + _ "InnerException: {1}", invOp.Message, invOp.InnerException.Message)) invOp.MarkErrorAsHandled() End If Else result = invokeOp.Value End If End Function End Class
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