本文整理匯總了VB.NET中System.AppDomainUnloadedException類的典型用法代碼示例。如果您正苦於以下問題：VB.NET AppDomainUnloadedException類的具體用法？VB.NET AppDomainUnloadedException怎麽用？VB.NET AppDomainUnloadedException使用的例子？那麽, 這裏精選的類代碼示例或許可以為您提供幫助。
在下文中一共展示了AppDomainUnloadedException類的2個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的VB.NET代碼示例。
示例1: Example
' 導入命名空間
Imports System.Threading
Imports System.Runtime.InteropServices
Public Class Example
Public Shared Sub Main()
' 1. Queue ThreadProc as a task for a ThreadPool thread.
ThreadPool.QueueUserWorkItem(AddressOf ThreadProc, _
" from a ThreadPool thread")
Thread.Sleep(1000)
' 2. Execute ThreadProc on an ordinary thread.
Dim t As New Thread(AddressOf ThreadProc)
t.Start(" from an ordinary thread")
t.Join()
' 3. Execute ThreadProc on the main thread, with
' exception handling.
Try
ThreadProc(" from the main application thread (handled)")
Catch adue As AppDomainUnloadedException
Console.WriteLine("Main thread caught AppDomainUnloadedException: {0}", _
adue.Message)
End Try
' 4. Execute ThreadProc on the main thread without
' exception handling.
ThreadProc(" from the main application thread (unhandled)")
Console.WriteLine("Main: This message is never displayed.")
End Sub
Private Shared Sub ThreadProc(ByVal state As Object)
' Create an application domain, and create an instance
' of TestClass in the application domain. The first
' parameter of CreateInstanceAndUnwrap is the name of
' this executable. If you compile the example code using
' any name other than "Sample.exe", you must change the
' parameter appropriately.
Dim ad As AppDomain = AppDomain.CreateDomain("TestDomain")
Dim o As Object = ad.CreateInstanceAndUnwrap("Sample", "TestClass")
Dim tc As TestClass = CType(o, TestClass)
' In the new application domain, execute a method that
' unloads the AppDomain. The unhandled exception this
' causes ends the current thread.
tc.UnloadCurrentDomain(state)
Console.WriteLine("ThreadProc: This message is never displayed.")
End Sub
End Class
' TestClass derives from MarshalByRefObject, so it can be marshaled
' across application domain boundaries.
'
Public Class TestClass
Inherits MarshalByRefObject
Public Sub UnloadCurrentDomain(ByVal state As Object)
Console.WriteLine(vbLf & "Unloading the current AppDomain{0}.", state)
' Unload the current application domain. This causes
' an AppDomainUnloadedException to be thrown.
'
AppDomain.Unload(AppDomain.CurrentDomain)
End Sub
End Class輸出：
Unloading the current AppDomain from a ThreadPool thread. Unloading the current AppDomain from an ordinary thread. Unloading the current AppDomain from the main application thread (handled). Main thread caught AppDomainUnloadedException: The application domain in which the thread was running has been unloaded. Unloading the current AppDomain from the main application thread (unhandled). Unhandled Exception: System.AppDomainUnloadedException: The application domain in which the thread was running has been unloaded. at TestClass.UnloadCurrentDomain(Object state) at Example.ThreadProc(Object state) at Example.Main()
示例2: ADUnload
' 導入命名空間
Imports System.Reflection
Imports System.Security.Policy
Class ADUnload
Public Shared Sub Main()
'Create evidence for the new appdomain.
Dim adevidence As Evidence = AppDomain.CurrentDomain.Evidence
' Create the new application domain.
Dim domain As AppDomain = AppDomain.CreateDomain("MyDomain", adevidence)
Console.WriteLine(("Host domain: " + AppDomain.CurrentDomain.FriendlyName))
Console.WriteLine(("child domain: " + domain.FriendlyName))
' Unload the application domain.
AppDomain.Unload(domain)
Try
Console.WriteLine()
' Note that the following statement creates an exception because the domain no longer exists.
Console.WriteLine(("child domain: " + domain.FriendlyName))
Catch e As AppDomainUnloadedException
Console.WriteLine("The appdomain MyDomain does not exist.")
End Try
End Sub
End Class