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CheckForUpdateCompletedEventArgs Class

Note: This class is new in the .NET Framework version 2.0.

Represents detailed update information obtained through a call to CheckForUpdateAsync.

Namespace: System.Deployment.Application
Assembly: System.Deployment (in system.deployment.dll)

public ref class CheckForUpdateCompletedEventArgs : public AsyncCompletedEventArgs
public class CheckForUpdateCompletedEventArgs extends AsyncCompletedEventArgs
public class CheckForUpdateCompletedEventArgs extends AsyncCompletedEventArgs

With CheckForUpdateCompletedEventArgs, you can decide whether to upgrade your ClickOnce application based on information about the newest version. UpdateAvailable will return a Boolean value indicating whether there is a new update at all. The AvailableVersion property provides the version number of the new version, while MinimumRequiredVersion provides the earliest version that the user should have installed on the computer. IsUpdateRequired expresses whether the latest available update is required of the user. Finally, UpdateSizeBytes expresses the total size of the update.

The following code example uses UpdateAvailable to determine if there is a new application update, and IsUpdateRequired to determine whether to ask the user to install the update.

private:
    long sizeOfUpdate;


private:
    void Form1_Load(Object^ sender, System::EventArgs^ e)
    {
        DoUpdate();
    }

public:
    void DoUpdate()
    {
        if (ApplicationDeployment::IsNetworkDeployed)
        {
            ApplicationDeployment^ currentAppDeployment =
                ApplicationDeployment::CurrentDeployment;
            currentAppDeployment->CheckForUpdateCompleted +=
                gcnew CheckForUpdateCompletedEventHandler(
                this, &Form1::currentDeploy_CheckForUpdateCompleted);
            currentAppDeployment->CheckForUpdateAsync();
        }
    }

    // If update is available, fetch it.
    void currentDeploy_CheckForUpdateCompleted(Object^ sender,
        CheckForUpdateCompletedEventArgs^ e)
    {
        if (nullptr != e->Error)
        {
            // Log error.
            return;
        }

        if (e->UpdateAvailable)
        {
            sizeOfUpdate = (long) e->UpdateSizeBytes;
            if (!e->IsUpdateRequired)
            {
                System::Windows::Forms::DialogResult 
                    updateDialogueResult = MessageBox::Show(
                    "An update is available.Would you like to update the" +
                    " application now?", "Update Available",
                    MessageBoxButtons::OKCancel);
                if (System::Windows::Forms::DialogResult::OK == 
                    updateDialogueResult)
                {
                    BeginUpdate();
                }
            }
            else
            {
                BeginUpdate();
            }
        }
    }

    void BeginUpdate()
    {
        ApplicationDeployment^ ad = ApplicationDeployment::CurrentDeployment;
        ad->UpdateCompleted +=
            gcnew AsyncCompletedEventHandler(
            this, &Form1::CurrentDeployment_UpdateCompleted);

        // Indicate progress in the application's status bar.
        ad->UpdateProgressChanged +=
            gcnew DeploymentProgressChangedEventHandler(this, 
            &Form1::ad_ProgressChanged);

        ad->UpdateAsync();
    }

    void CurrentDeployment_UpdateCompleted(Object^ sender,
        AsyncCompletedEventArgs^ e)
    {
        if (!e->Cancelled)
        {
            if (nullptr != e->Error)
            {
                System::Windows::Forms::DialogResult 
                    restartDialogueResult = MessageBox::Show(
                    "The application has been updated. Restart?",
                    "Restart Application",
                    MessageBoxButtons::OKCancel);
                if (System::Windows::Forms::DialogResult::OK == 
                    restartDialogueResult)
                {
                    Application::Restart();
                }
            }
            else
            {
                // Replace with your own error reporting or logging.
                MessageBox::Show(
                    "The application encountered an error in downloading" +
                    " the latest update. Error: {0}",
                    e->Error->Message);
            }
        }
        else
        {
            // Replace with your own error reporting or logging.
            MessageBox::Show("The update of the application's latest" +
                " version was cancelled.");
        }
    }

    void ad_ProgressChanged(Object^ sender,
        DeploymentProgressChangedEventArgs^ e)
    {
        String^ progressText =
            String::Format(
            "{0:D}K out of {1:D}K downloaded - {2:D}% complete",
            e->BytesCompleted / 1024, e->BytesTotal / 1024,
            e->ProgressPercentage);
        statusStrip1->Text = progressText;
    }

System.Object
   System.EventArgs
     System.ComponentModel.AsyncCompletedEventArgs
      System.Deployment.Application.CheckForUpdateCompletedEventArgs

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0

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