升级完成后 Clickonce 应用程序不会重新启动

我在用应用部署 http://msdn.microsoft.com/en-us/library/system.deployment.application.applicationdeployment.aspx类检查升级是否可用，然后升级应用程序，如下所示

Dim AD As System.Deployment.Application.ApplicationDeployment = System.Deployment.Application.ApplicationDeployment.CurrentDeployment
Dim info As System.Deployment.Application.UpdateCheckInfo = Nothing

Me.DialogResult = Windows.Forms.DialogResult.Cancel
Me.Close()

AD.Update()

Application.Restart() // this doesn't work which is still ok.

重新启动不起作用，因此我尝试获取升级的应用程序可执行路径并更新注册表，以便当用户重新启动系统时将启动最新的应用程序。

升级后我无法获取应用程序的安装路径。它在 c\document...\user... 中创建新文件夹。我知道。但是，需要获取此路径并更新注册表。

有人有任何指点吗？

这可能是因为您在 ClickOnce 部署的应用程序中使用 VB 的本机单实例应用程序功能。该功能使用Mutex在后台，它没有及时发布以供应用程序重新启动。因此，您所看到的行为 - 它不会重新启动。

我刚才也遇到了同样的问题。为了解决这个问题，我必须使用 VB 翻译并对我发现的技巧进行轻微修改here http://www.codeproject.com/Articles/32908/。本质上我们需要的是一个共享实例Mutex并暂停 3 秒Application.Restart()给现有版本时间来发布其Mutex。不要忘记取消选中“制作单实例应用程序”在项目属性页的“应用程序”选项卡上。

下面是我最终得到的代码。这样我们就可以拥有世界上最好的东西——我们非常喜欢的 VB 漂亮的应用程序框架、单实例功能和 ClickOnce API 重新启动。一次全部。我头晕了。

帽子提示＃1：devzoo，对于他的代码项目发布 http://www.codeproject.com/Articles/32908/，展示主要概念。

帽子提示＃2：NullFX，对于他的WinApi PostMessage() 的想法 http://sanity-free.org/143/csharp_dotnet_single_instance_application.html，正如引用的devzoo.

帽子提示＃3：@cmptrs4now为了他的IsRestarting3秒暂停的想法here https://stackoverflow.com/questions/95098/.

帽子提示＃4：@pstrjds为了他的澄清here https://stackoverflow.com/questions/7519465/net-mutext-releasemutex-and-mutex-close。根据他的建议我改变了Mutex.ReleaseMutex() to Mutex.Close()以下。这看起来更安全。

HTH

Friend Class Main
  Inherits System.Windows.Forms.Form

  Protected Overrides Sub WndProc(ByRef Message As Message)
    If Message.Msg = SingleInstance.WM_SHOWFIRSTINSTANCE Then
      ShowWindow()
    End If
    MyBase.WndProc(Message)
  End Sub

  Private Sub ShowWindow()
    Me.WindowState = FormWindowState.Normal
    Me.Focus()
  End Sub

  Private Sub cmdUpdate_Click(Sender As Object, e As EventArgs) Handles cmdUpdate.Click
    If ApplicationDeployment.IsNetworkDeployed Then
      If ApplicationDeployment.CurrentDeployment.CheckForUpdate(False)
        ApplicationDeployment.CurrentDeployment.Update()

        MsgBox("The application has been updated and will now restart.", MsgBoxStyle.Information)

        My.Settings.IsRestarting = True
        My.Settings.Save()

        Application.Restart()
      End If
    End If
  End Sub
End Class

Namespace My
  ' The following events are availble for MyApplication:
  ' 
  ' Startup: Raised when the application starts, before the startup form is created.
  ' Shutdown: Raised after all application forms are closed.  This event is not raised if the application terminates abnormally.
  ' UnhandledException: Raised if the application encounters an unhandled exception.
  ' StartupNextInstance: Raised when launching a single-instance application and the application is already active. 
  ' NetworkAvailabilityChanged: Raised when the network connection is connected or disconnected.
  Partial Friend Class MyApplication
    Private Sub MyApplication_Startup(sender As Object, e As ApplicationServices.StartupEventArgs) Handles Me.Startup
      If My.Settings.IsRestarting Then
        My.Settings.IsRestarting = False
        My.Settings.Save()
        Thread.Sleep(3000)
      End If

      If Not SingleInstance.Start() Then
        SingleInstance.ShowFirstInstance()
        e.Cancel = True
      End If
    End Sub

    Private Sub MyApplication_Shutdown(sender As Object, e As EventArgs) Handles Me.Shutdown
      SingleInstance.Stop()
    End Sub
  End Class
End Namespace

Public NotInheritable Class SingleInstance
  Public Shared ReadOnly WM_SHOWFIRSTINSTANCE As Integer = WinApi.RegisterWindowMessage("WM_SHOWFIRSTINSTANCE|{0}", ProgramInfo.AssemblyGuid)
  Private Shared Mutex As Mutex

  Public Shared Function Start() As Boolean
    Dim lIsOnlyInstance As Boolean
    Dim sMutexName As String

    lIsOnlyInstance = False
    sMutexName = String.Format("Local\{0}", ProgramInfo.AssemblyGuid)

    ' If you want your app to be limited to a single instance
    ' across ALL SESSIONS (multiple users & terminal services),
    ' then use the following line instead:
    ' sMutexName = String.Format("Global\\{0}", ProgramInfo.AssemblyGuid);

    Mutex = New Mutex(True, sMutexName, lIsOnlyInstance)
    Return lIsOnlyInstance
  End Function

  Public Shared Sub ShowFirstInstance()
    WinApi.PostMessage(New IntPtr(WinApi.HWND_BROADCAST), WM_SHOWFIRSTINSTANCE, IntPtr.Zero, IntPtr.Zero)
  End Sub

  Public Shared Sub [Stop]()
    Mutex.Close()
  End Sub
End Class

Public NotInheritable Class WinApi
  <DllImport("user32")> _
  Public Shared Function RegisterWindowMessage(message As String) As Integer
  End Function

  <DllImport("user32")> _
  Public Shared Function PostMessage(hwnd As IntPtr, msg As Integer, wparam As IntPtr, lparam As IntPtr) As Boolean
  End Function

  <DllImport("user32")> _
  Public Shared Function ShowWindow(hWnd As IntPtr, nCmdShow As Integer) As Boolean
  End Function

  <DllImport("user32")> _
  Public Shared Function SetForegroundWindow(hWnd As IntPtr) As Boolean
  End Function

  Public Shared Function RegisterWindowMessage(Template As String, ParamArray Values As Object()) As Integer
    Return RegisterWindowMessage(String.Format(Template, Values))
  End Function

  Public Shared Sub ShowToFront(Window As IntPtr)
    ShowWindow(Window, SW_SHOWNORMAL)
    SetForegroundWindow(Window)
  End Sub

  Public Const HWND_BROADCAST As Integer = &HFFFF
  Public Const SW_SHOWNORMAL As Integer = 1
End Class

Public NotInheritable Class ProgramInfo
  Public Shared ReadOnly Property AssemblyGuid As String
    Get
      Dim aAttributes As Object()

      aAttributes = Assembly.GetEntryAssembly.GetCustomAttributes(GetType(GuidAttribute), False)

      If aAttributes.Length = 0 Then
        AssemblyGuid = String.Empty
      Else
        AssemblyGuid = DirectCast(aAttributes(0), GuidAttribute).Value
      End If
    End Get
  End Property
End Class