InPlaceHostingManager Class

Definition

Namespace:

System.Deployment.Application

Assembly:

System.Deployment.dll

Install or update a ClickOnce deployment on a computer.

C#

public class InPlaceHostingManager : IDisposable

Inheritance

Object

InPlaceHostingManager

Implements

IDisposable

Examples

The following code example shows how to use InPlaceHostingManager to install a ClickOnce application programmatically on a client computer.

C#

InPlaceHostingManager iphm = null;

public void InstallApplication(string deployManifestUriStr)
{
    try
    {
        Uri deploymentUri = new Uri(deployManifestUriStr);
        iphm = new InPlaceHostingManager(deploymentUri, false);
    }
    catch (UriFormatException uriEx)
    {
        MessageBox.Show("Cannot install the application: " + 
            "The deployment manifest URL supplied is not a valid URL. " +
            "Error: " + uriEx.Message);
        return;
    }
    catch (PlatformNotSupportedException platformEx)
    {
        MessageBox.Show("Cannot install the application: " + 
            "This program requires Windows XP or higher. " +
            "Error: " + platformEx.Message);
        return;
    }
    catch (ArgumentException argumentEx)
    {
        MessageBox.Show("Cannot install the application: " + 
            "The deployment manifest URL supplied is not a valid URL. " +
            "Error: " + argumentEx.Message);
        return;
    }

    iphm.GetManifestCompleted += new EventHandler<GetManifestCompletedEventArgs>(iphm_GetManifestCompleted);
    iphm.GetManifestAsync();
}

void iphm_GetManifestCompleted(object sender, GetManifestCompletedEventArgs e)
{
    // Check for an error.
    if (e.Error != null)
    {
        // Cancel download and install.
        MessageBox.Show("Could not download manifest. Error: " + e.Error.Message);
        return;
    }

    // bool isFullTrust = CheckForFullTrust(e.ApplicationManifest);

    // Verify this application can be installed.
    try
    {
        // the true parameter allows InPlaceHostingManager
        // to grant the permissions requested in the applicaiton manifest.
        iphm.AssertApplicationRequirements(true) ; 
    }
    catch (Exception ex)
    {
        MessageBox.Show("An error occurred while verifying the application. " +
            "Error: " + ex.Message);
        return;
    }

    // Use the information from GetManifestCompleted() to confirm 
    // that the user wants to proceed.
    string appInfo = "Application Name: " + e.ProductName;
    appInfo += "\nVersion: " + e.Version;
    appInfo += "\nSupport/Help Requests: " + (e.SupportUri != null ?
        e.SupportUri.ToString() : "N/A");
    appInfo += "\n\nConfirmed that this application can run with its requested permissions.";
    // if (isFullTrust)
    // appInfo += "\n\nThis application requires full trust in order to run.";
    appInfo += "\n\nProceed with installation?";

    DialogResult dr = MessageBox.Show(appInfo, "Confirm Application Install",
        MessageBoxButtons.OKCancel, MessageBoxIcon.Question);
    if (dr != System.Windows.Forms.DialogResult.OK)
    {
        return;
    }

    // Download the deployment manifest. 
    iphm.DownloadProgressChanged += new EventHandler<DownloadProgressChangedEventArgs>(iphm_DownloadProgressChanged);
    iphm.DownloadApplicationCompleted += new EventHandler<DownloadApplicationCompletedEventArgs>(iphm_DownloadApplicationCompleted);

    try
    {
        // Usually this shouldn't throw an exception unless AssertApplicationRequirements() failed, 
        // or you did not call that method before calling this one.
        iphm.DownloadApplicationAsync();
    }
    catch (Exception downloadEx)
    {
        MessageBox.Show("Cannot initiate download of application. Error: " +
            downloadEx.Message);
        return;
    }
}

/*
private bool CheckForFullTrust(XmlReader appManifest)
{
    if (appManifest == null)
    {
        throw (new ArgumentNullException("appManifest cannot be null."));
    }

    XAttribute xaUnrestricted =
        XDocument.Load(appManifest)
            .Element("{urn:schemas-microsoft-com:asm.v1}assembly")
            .Element("{urn:schemas-microsoft-com:asm.v2}trustInfo")
            .Element("{urn:schemas-microsoft-com:asm.v2}security")
            .Element("{urn:schemas-microsoft-com:asm.v2}applicationRequestMinimum")
            .Element("{urn:schemas-microsoft-com:asm.v2}PermissionSet")
            .Attribute("Unrestricted"); // Attributes never have a namespace

    if (xaUnrestricted != null)
        if (xaUnrestricted.Value == "true")
            return true;

    return false;
}
*/

void iphm_DownloadApplicationCompleted(object sender, DownloadApplicationCompletedEventArgs e)
{
    // Check for an error.
    if (e.Error != null)
    {
        // Cancel download and install.
        MessageBox.Show("Could not download and install application. Error: " + e.Error.Message);
        return;
    }

    // Inform the user that their application is ready for use. 
    MessageBox.Show("Application installed! You may now run it from the Start menu.");
}

void iphm_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
{
    // you can show percentage of task completed using e.ProgressPercentage
}

Remarks

You can use InPlaceHostingManager to write programs that install ClickOnce applications programmatically. For example, you can use this class in a controlled system management software (SMS) environment or in situations where you need a complex installation that performs a number of pre-installation or post-installation operations on the local computer. Generally, you will want to use the members of this class in a specific order:

1. Create a new instance of InPlaceHostingManager.

2. Download the deployment manifest by using GetManifestAsync.

3. Check that the application can be run with the appropriate permissions by using AssertApplicationRequirements.

4. Download and install the application by using DownloadApplicationAsync.

• If you call any of these parameters out of order, they will throw an exception.

InPlaceHostingManager can install a ClickOnce application, but cannot execute it. Some methods in this class, such as Execute, are reserved for use when downloading a Windows Presentation Foundation-based application that runs inside a Web browser.

To use InPlaceHostingManager to download and install applications, you must make sure that the certificate for signing the ClickOnce applications you plan to install is already installed on client computers as a trusted publisher. For more information on trusted publishers, see Trusted Application Deployment Overview.

Napomena

There is currently a product limitation that prevents InPlaceHostingManager from working correctly when you debug your code using Visual Studio. If you debug your application in Visual Studio by using the F5 key, the sample will throw mysterious exceptions when you call DownloadApplicationAsync. To debug using Visual Studio, start the application without debugging, and then attach the debugger. Alternatively, you can use another debugger, such as WinDbg.

Constructors

InPlaceHostingManager(Uri, Boolean)	Creates a new instance of InPlaceHostingManager to download and install the specified application, which can be either a stand-alone Windows Forms-based application or an application hosted in a Web browser.
InPlaceHostingManager(Uri)	Creates a new instance of InPlaceHostingManager to download and install the specified browser-hosted application.

Methods

AssertApplicationRequirements()	Determines whether the ClickOnce application has the appropriate permissions and platform dependencies to run on the local computer.
AssertApplicationRequirements(Boolean)	Determines whether the ClickOnce application has the appropriate permissions and platform dependencies to run on the local computer.
CancelAsync()	Cancels an asynchronous download operation.
Dispose()	Releases all resources used by the InPlaceHostingManager.
DownloadApplicationAsync()	Downloads an application update in the background.
Execute()	Launches the ClickOnce application, if and only if it is a Windows Presentation Foundation-based application running in a Web browser.
GetManifestAsync()	Downloads the deployment manifest of the ClickOnce application in the background, and raises an event when the operation has either completed or encountered an error.
UninstallCustomAddIn(String)	Removes a previously installed user-defined component of an application.
UninstallCustomUXApplication(String)	Removes a ClickOnce application that includes the <customUX> element.

Events

DownloadApplicationCompleted	Occurs when the application has finished downloading to the local computer.
DownloadProgressChanged	Occurs when there is a change in the status of an application or manifest download.
GetManifestCompleted	Occurs when the deployment manifest has been downloaded to the local computer.

Applies to