UpdateCheckInfo.MinimumRequiredVersion Property

Definition

Namespace:

System.Deployment.Application

Assembly:

System.Deployment.dll

Gets the minimum version that the user must have installed on the computer.

public:
 property Version ^ MinimumRequiredVersion { Version ^ get(); };

public Version MinimumRequiredVersion { get; }

member this.MinimumRequiredVersion : Version

Public ReadOnly Property MinimumRequiredVersion As Version

Property Value

Version

A Version expressing the least version that the user must install.

Exceptions

InvalidOperationException

There is no new version available to install.

Examples

The following code example demonstrates displaying the MinimumRequiredVersion property to the user when there is a required update available.

public:
    void InstallUpdateSync()
    {
        if (ApplicationDeployment::IsNetworkDeployed)
        {
            bool isUpdateAvailable = false;
            ApplicationDeployment^ appDeployment =
                ApplicationDeployment::CurrentDeployment;

            try
            {
                isUpdateAvailable = appDeployment->CheckForUpdate();
            }
            catch (InvalidOperationException^ ex)
            {
                MessageBox::Show("The update check failed. Error: {0}",
                    ex->Message);
                return;
            }

            if (isUpdateAvailable)
            {
                try
                {
                    appDeployment->Update();
                    MessageBox::Show(
                        "The application has been upgraded, and will now " +
                        "restart.");
                    Application::Restart();
                }
                catch (Exception^ ex)
                {
                    MessageBox::Show("The update failed. Error: {0}",
                        ex->Message);
                    return;
                }

            }
        }
    }

private void InstallUpdateSyncWithInfo()
{
    UpdateCheckInfo info = null;

    if (ApplicationDeployment.IsNetworkDeployed)
    {
        ApplicationDeployment ad = ApplicationDeployment.CurrentDeployment;

        try
        {
            info = ad.CheckForDetailedUpdate();
        }
        catch (DeploymentDownloadException dde)
        {
            MessageBox.Show("The new version of the application cannot be downloaded at this time. \n\nPlease check your network connection, or try again later. Error: " + dde.Message);
            return;
        }
        catch (InvalidDeploymentException ide)
        {
            MessageBox.Show("Cannot check for a new version of the application. The ClickOnce deployment is corrupt. Please redeploy the application and try again. Error: " + ide.Message);
            return;
        }
        catch (InvalidOperationException ioe)
        {
            MessageBox.Show("This application cannot be updated. It is likely not a ClickOnce application. Error: " + ioe.Message);
            return;
        }

        if (info.UpdateAvailable)
        {
            Boolean doUpdate = true;

            if (!info.IsUpdateRequired)
            {
                DialogResult dr = MessageBox.Show("An update is available. Would you like to update the application now?", "Update Available", MessageBoxButtons.OKCancel);
                if (!(DialogResult.OK == dr))
                {
                    doUpdate = false;
                }
            }
            else
            {
                // Display a message that the app MUST reboot. Display the minimum required version.
                MessageBox.Show("This application has detected a mandatory update from your current " + 
                    "version to version " + info.MinimumRequiredVersion.ToString() + 
                    ". The application will now install the update and restart.", 
                    "Update Available", MessageBoxButtons.OK, 
                    MessageBoxIcon.Information);
            }

            if (doUpdate)
            {
                try
                {
                    ad.Update();
                    MessageBox.Show("The application has been upgraded, and will now restart.");
                    Application.Restart();
                }
                catch (DeploymentDownloadException dde)
                {
                    MessageBox.Show("Cannot install the latest version of the application. \n\nPlease check your network connection, or try again later. Error: " + dde);
                    return;
                }
            }
        }
    }
}

Private Sub InstallUpdateSyncWithInfo()
    Dim info As UpdateCheckInfo = Nothing

    If (ApplicationDeployment.IsNetworkDeployed) Then
        Dim AD As ApplicationDeployment = ApplicationDeployment.CurrentDeployment

        Try
            info = AD.CheckForDetailedUpdate()
        Catch dde As DeploymentDownloadException
            MessageBox.Show("The new version of the application cannot be downloaded at this time. " + ControlChars.Lf & ControlChars.Lf & "Please check your network connection, or try again later. Error: " + dde.Message)
            Return
        Catch ioe As InvalidOperationException
            MessageBox.Show("This application cannot be updated. It is likely not a ClickOnce application. Error: " & ioe.Message)
            Return
        End Try

        If (info.UpdateAvailable) Then
            Dim doUpdate As Boolean = True

            If (Not info.IsUpdateRequired) Then
                Dim dr As DialogResult = MessageBox.Show("An update is available. Would you like to update the application now?", "Update Available", MessageBoxButtons.OKCancel)
                If (Not System.Windows.Forms.DialogResult.OK = dr) Then
                    doUpdate = False
                End If
            Else
                ' Display a message that the app MUST reboot. Display the minimum required version.
                MessageBox.Show("This application has detected a mandatory update from your current " & _
                    "version to version " & info.MinimumRequiredVersion.ToString() & _
                    ". The application will now install the update and restart.", _
                    "Update Available", MessageBoxButtons.OK, _
                    MessageBoxIcon.Information)
            End If

            If (doUpdate) Then
                Try
                    AD.Update()
                    MessageBox.Show("The application has been upgraded, and will now restart.")
                    Application.Restart()
                Catch dde As DeploymentDownloadException
                    MessageBox.Show("Cannot install the latest version of the application. " & ControlChars.Lf & ControlChars.Lf & "Please check your network connection, or try again later.")
                    Return
                End Try
            End If
        End If
        End If
End Sub

Remarks

Applications can miss required updates when the user takes on a special assignment or is away from the computer for weeks or months. Use

MinimumRequiredVersion to determine if the user has not upgraded the application in a while, and has missed one or more required updates.