LogoutOperation Class

Artigo
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.]

Operation type returned from Logout operations on AuthenticationService.

Inheritance Hierarchy

System.Object
  System.ServiceModel.DomainServices.Client.OperationBase
    System.ServiceModel.DomainServices.Client.ApplicationServices.AuthenticationOperation
      System.ServiceModel.DomainServices.Client.ApplicationServices.LogoutOperation

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

Syntax

'Declaration
Public NotInheritable Class LogoutOperation _
    Inherits AuthenticationOperation

'Usage
Dim instance As LogoutOperation

public sealed class LogoutOperation : AuthenticationOperation

public ref class LogoutOperation sealed : public AuthenticationOperation

[<SealedAttribute>]
type LogoutOperation =  
    class
        inherit AuthenticationOperation
    end

public final class LogoutOperation extends AuthenticationOperation

The LogoutOperation type exposes the following members.

Properties

	Name	Description
	AsyncResult	Gets the asynchronous result returned from BeginCore. (Inherited from AuthenticationOperation.)
	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.)
	Result	Gets the result as an AuthenticationResult. (Inherited from AuthenticationOperation.)
	Service	Gets the service this operation will use to implement Begin, Cancel, and End. (Inherited from AuthenticationOperation.)
	SupportsCancellation	Gets a value that indicates whether the operation supports cancellation. (Inherited from AuthenticationOperation.)
	User	Gets the user principal. (Inherited from AuthenticationOperation.)
	UserState	Gets the optional user state for this operation. (Inherited from OperationBase.)

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Methods

	Name	Description
	BeginCore	Invokes the corresponding Begin method in the underlying asynchronous result implementation. (Inherited from AuthenticationOperation.)
	Cancel	Cancels the operation. (Inherited from OperationBase.)
	CancelCore	When overridden in a derived class, provides the logic to cancel the operation. (Inherited from OperationBase.)
	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.)
	EndCore	Invokes the corresponding End method in the underlying asynchronous result implementation. (Inherited from AuthenticationOperation.)
	Equals	(Inherited from Object.)
	Finalize	(Inherited from Object.)
	GetHashCode	(Inherited from Object.)
	GetType	(Inherited from Object.)
	InvokeCompleteAction	Invokes the completion callback. (Inherited from OperationBase.)
	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.)
	RaiseCompletionPropertyChanges	Raises property changes after the operation has completed. (Inherited from AuthenticationOperation.)
	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

The following example shows a call to the Logout method with callback method that accepts a LogoutOperation object as a parameter.

Protected Overrides Sub OnNavigatedTo(ByVal e As System.Windows.Navigation.NavigationEventArgs)
    SetControlVisibility(WebContext.Current.User.IsAuthenticated)
End Sub

Private Sub LoginButton_Click(ByVal sender As Object, ByVal e As RoutedEventArgs)
    Dim lp As LoginParameters = New LoginParameters(UserName.Text, Password.Password)
    WebContext.Current.Authentication.Login(lp, AddressOf Me.LoginOperation_Completed, Nothing)
    LoginButton.IsEnabled = False
    LoginResult.Text = ""
End Sub

Private Sub LoginOperation_Completed(ByVal lo As LoginOperation)
    If (lo.HasError) Then
        LoginResult.Text = lo.Error.Message
        LoginResult.Visibility = System.Windows.Visibility.Visible
        lo.MarkErrorAsHandled()
    ElseIf (lo.LoginSuccess = False) Then
        LoginResult.Text = "Login failed. Please check user name and password."
        LoginResult.Visibility = System.Windows.Visibility.Visible
    ElseIf (lo.LoginSuccess = True) Then
        SetControlVisibility(True)
    End If
    LoginButton.IsEnabled = True
End Sub

Private Sub SetControlVisibility(ByVal isAuthenticated As Boolean)
    If (isAuthenticated) Then
        LoginBorder.Visibility = System.Windows.Visibility.Collapsed
        WelcomeText.Text = "Welcome " + WebContext.Current.User.Name
        WelcomeText.Visibility = System.Windows.Visibility.Visible
        LogoutButton.Visibility = System.Windows.Visibility.Visible
    Else
        LoginBorder.Visibility = System.Windows.Visibility.Visible
        WelcomeText.Visibility = System.Windows.Visibility.Collapsed
        LogoutButton.Visibility = System.Windows.Visibility.Collapsed
    End If
End Sub

Private Sub LogoutButton_Click(ByVal sender As Object, ByVal e As RoutedEventArgs)
    WebContext.Current.Authentication.Logout(AddressOf Me.LogoutOperation_Completed, Nothing)
End Sub

Private Sub LogoutOperation_Completed(ByVal lo As LogoutOperation)
    If (Not (lo.HasError)) Then
        SetControlVisibility(False)
    Else
        Dim ew As ErrorWindow = New ErrorWindow("Logout failed.", "Please try logging out again.")
        ew.Show()
        lo.MarkErrorAsHandled()
    End If
End Sub

protected override void OnNavigatedTo(NavigationEventArgs e)
{
    SetControlVisibility(WebContext.Current.User.IsAuthenticated);
}

private void LoginButton_Click(object sender, RoutedEventArgs e)
{
    LoginParameters lp = new LoginParameters(UserName.Text, Password.Password);
    WebContext.Current.Authentication.Login(lp, this.LoginOperation_Completed, null);
    LoginButton.IsEnabled = false;
    LoginResult.Text = "";
}

private void LoginOperation_Completed(LoginOperation lo)
{
    if (lo.HasError)
    {
        LoginResult.Text = lo.Error.Message;
        LoginResult.Visibility = System.Windows.Visibility.Visible;
        lo.MarkErrorAsHandled();
    }
    else if (lo.LoginSuccess == false)
    {
        LoginResult.Text = "Login failed. Please check user name and password.";
        LoginResult.Visibility = System.Windows.Visibility.Visible;
    }
    else if (lo.LoginSuccess == true)
    {
        SetControlVisibility(true);
    }
    LoginButton.IsEnabled = true;
}

private void SetControlVisibility(bool isAuthenticated)
{
    if (isAuthenticated)
    {
        LoginBorder.Visibility = System.Windows.Visibility.Collapsed;
        WelcomeText.Text = "Welcome " + WebContext.Current.User.Name;
        WelcomeText.Visibility = System.Windows.Visibility.Visible;
        LogoutButton.Visibility = System.Windows.Visibility.Visible;
    }
    else
    {
        LoginBorder.Visibility = System.Windows.Visibility.Visible;
        WelcomeText.Visibility = System.Windows.Visibility.Collapsed;
        LogoutButton.Visibility = System.Windows.Visibility.Collapsed;
    }
}

private void LogoutButton_Click(object sender, RoutedEventArgs e)
{
    WebContext.Current.Authentication.Logout(this.LogoutOperation_Completed, null);
}

private void LogoutOperation_Completed(LogoutOperation lo)
{

    if (!lo.HasError)
    {
        SetControlVisibility(false);
    }
    else
    {
        ErrorWindow ew = new ErrorWindow("Logout failed.", "Please try logging out again.");
        ew.Show();
        lo.MarkErrorAsHandled();
    }
}

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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