CheckForUpdateCompletedEventArgs Class
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Represents detailed update information obtained through a call to CheckForUpdateAsync().
public ref class CheckForUpdateCompletedEventArgs : System::ComponentModel::AsyncCompletedEventArgspublic class CheckForUpdateCompletedEventArgs : System.ComponentModel.AsyncCompletedEventArgstype CheckForUpdateCompletedEventArgs = class
inherit AsyncCompletedEventArgsPublic Class CheckForUpdateCompletedEventArgs
Inherits AsyncCompletedEventArgs- Inheritance
-
CheckForUpdateCompletedEventArgs
Examples
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;
}
long sizeOfUpdate = 0;
private void UpdateApplication()
{
if (ApplicationDeployment.IsNetworkDeployed)
{
ApplicationDeployment ad = ApplicationDeployment.CurrentDeployment;
ad.CheckForUpdateCompleted += new CheckForUpdateCompletedEventHandler(ad_CheckForUpdateCompleted);
ad.CheckForUpdateProgressChanged += new DeploymentProgressChangedEventHandler(ad_CheckForUpdateProgressChanged);
ad.CheckForUpdateAsync();
}
}
void ad_CheckForUpdateProgressChanged(object sender, DeploymentProgressChangedEventArgs e)
{
downloadStatus.Text = String.Format("Downloading: {0}. {1:D}K of {2:D}K downloaded.", GetProgressString(e.State), e.BytesCompleted/1024, e.BytesTotal/1024);
}
string GetProgressString(DeploymentProgressState state)
{
if (state == DeploymentProgressState.DownloadingApplicationFiles)
{
return "application files";
}
else if (state == DeploymentProgressState.DownloadingApplicationInformation)
{
return "application manifest";
}
else
{
return "deployment manifest";
}
}
void ad_CheckForUpdateCompleted(object sender, CheckForUpdateCompletedEventArgs e)
{
if (e.Error != null)
{
MessageBox.Show("ERROR: Could not retrieve new version of the application. Reason: \n" + e.Error.Message + "\nPlease report this error to the system administrator.");
return;
}
else if (e.Cancelled == true)
{
MessageBox.Show("The update was cancelled.");
}
// Ask the user if they would like to update the application now.
if (e.UpdateAvailable)
{
sizeOfUpdate = e.UpdateSizeBytes;
if (!e.IsUpdateRequired)
{
DialogResult dr = MessageBox.Show("An update is available. Would you like to update the application now?\n\nEstimated Download Time: ", "Update Available", MessageBoxButtons.OKCancel);
if (DialogResult.OK == dr)
{
BeginUpdate();
}
}
else
{
MessageBox.Show("A mandatory update is available for your application. We will install the update now, after which we will save all of your in-progress data and restart your application.");
BeginUpdate();
}
}
}
private void BeginUpdate()
{
ApplicationDeployment ad = ApplicationDeployment.CurrentDeployment;
ad.UpdateCompleted += new AsyncCompletedEventHandler(ad_UpdateCompleted);
// Indicate progress in the application's status bar.
ad.UpdateProgressChanged += new DeploymentProgressChangedEventHandler(ad_UpdateProgressChanged);
ad.UpdateAsync();
}
void ad_UpdateProgressChanged(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);
downloadStatus.Text = progressText;
}
void ad_UpdateCompleted(object sender, AsyncCompletedEventArgs e)
{
if (e.Cancelled)
{
MessageBox.Show("The update of the application's latest version was cancelled.");
return;
}
else if (e.Error != null)
{
MessageBox.Show("ERROR: Could not install the latest version of the application. Reason: \n" + e.Error.Message + "\nPlease report this error to the system administrator.");
return;
}
DialogResult dr = MessageBox.Show("The application has been updated. Restart? (If you do not restart now, the new version will not take effect until after you quit and launch the application again.)", "Restart Application", MessageBoxButtons.OKCancel);
if (DialogResult.OK == dr)
{
Application.Restart();
}
}
Private sizeOfUpdate As Long = 0
Dim WithEvents ADUpdateAsync As ApplicationDeployment
Private Sub UpdateApplication()
If (ApplicationDeployment.IsNetworkDeployed) Then
ADUpdateAsync = ApplicationDeployment.CurrentDeployment
ADUpdateAsync.CheckForUpdateAsync()
End If
End Sub
Private Sub ADUpdateAsync_CheckForUpdateProgressChanged(ByVal sender As Object, ByVal e As DeploymentProgressChangedEventArgs) Handles ADUpdateAsync.CheckForUpdateProgressChanged
DownloadStatus.Text = [String].Format("{0:D}K of {1:D}K downloaded.", e.BytesCompleted / 1024, e.BytesTotal / 1024)
End Sub
Private Sub ADUpdateAsync_CheckForUpdateCompleted(ByVal sender As Object, ByVal e As CheckForUpdateCompletedEventArgs) Handles ADUpdateAsync.CheckForUpdateCompleted
If (e.Error IsNot Nothing) Then
MessageBox.Show(("ERROR: Could not retrieve new version of the application. Reason: " + ControlChars.Lf + e.Error.Message + ControlChars.Lf + "Please report this error to the system administrator."))
Return
Else
If (e.Cancelled = True) Then
MessageBox.Show("The update was cancelled.")
End If
End If
' Ask the user if they would like to update the application now.
If (e.UpdateAvailable) Then
sizeOfUpdate = e.UpdateSizeBytes
If (Not e.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 (System.Windows.Forms.DialogResult.OK = dr) Then
BeginUpdate()
End If
Else
MessageBox.Show("A mandatory update is available for your application. We will install the update now, after which we will save all of your in-progress data and restart your application.")
BeginUpdate()
End If
End If
End Sub
Private Sub BeginUpdate()
ADUpdateAsync = ApplicationDeployment.CurrentDeployment
ADUpdateAsync.UpdateAsync()
End Sub
Private Sub ADUpdateAsync_UpdateProgressChanged(ByVal sender As Object, ByVal e As DeploymentProgressChangedEventArgs) Handles ADUpdateAsync.UpdateProgressChanged
Dim progressText As String = String.Format("{0:D}K out of {1:D}K downloaded - {2:D}% complete", e.BytesCompleted / 1024, e.BytesTotal / 1024, e.ProgressPercentage)
DownloadStatus.Text = progressText
End Sub
Private Sub ADUpdateAsync_UpdateCompleted(ByVal sender As Object, ByVal e As AsyncCompletedEventArgs) Handles ADUpdateAsync.UpdateCompleted
If (e.Cancelled) Then
MessageBox.Show("The update of the application's latest version was cancelled.")
Exit Sub
Else
If (e.Error IsNot Nothing) Then
MessageBox.Show("ERROR: Could not install the latest version of the application. Reason: " + ControlChars.Lf + e.Error.Message + ControlChars.Lf + "Please report this error to the system administrator.")
Exit Sub
End If
End If
Dim dr As DialogResult = MessageBox.Show("The application has been updated. Restart? (If you do not restart now, the new version will not take effect until after you quit and launch the application again.)", "Restart Application", MessageBoxButtons.OKCancel)
If (dr = System.Windows.Forms.DialogResult.OK) Then
Application.Restart()
End If
End Sub
Remarks
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.
Properties
| AvailableVersion |
Gets the version number of the latest uninstalled version. |
| IsUpdateRequired |
Gets a value indicating whether the update must be installed. |
| MinimumRequiredVersion |
Gets the minimum version that the user must have installed on the computer. |
| UpdateAvailable |
Gets whether an uninstalled update is available. |
| UpdateSizeBytes |
Gets the size of the available update. |