Application.Exit 事件
定義
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
發生在申請關閉且無法取消之前。
public:
event System::Windows::ExitEventHandler ^ Exit;public event System.Windows.ExitEventHandler Exit;member this.Exit : System.Windows.ExitEventHandler Public Custom Event Exit As ExitEventHandler 事件類型
範例
以下範例示範如何：
處理 AutoGeneratingColumn 事件。
檢查並更新 ApplicationExitCode 的 ExitEventArgs屬性。
在隔離儲存中寫入應用程式日誌。
將應用程式狀態持久化到隔離儲存。
<Application x:Class="CSharp.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
StartupUri="MainWindow.xaml"
ShutdownMode="OnExplicitShutdown"
Exit="App_Exit"
>
</Application>
using System;
using System.Collections;
using System.Windows;
using System.IO;
using System.IO.IsolatedStorage;
namespace CSharp
{
public enum ApplicationExitCode
{
Success = 0,
Failure = 1,
CantWriteToApplicationLog = 2,
CantPersistApplicationState = 3
}
public partial class App : Application
{
void App_Exit(object sender, ExitEventArgs e)
{
try
{
// Write entry to application log
if (e.ApplicationExitCode == (int)ApplicationExitCode.Success)
{
WriteApplicationLogEntry("Failure", e.ApplicationExitCode);
}
else
{
WriteApplicationLogEntry("Success", e.ApplicationExitCode);
}
}
catch
{
// Update exit code to reflect failure to write to application log
e.ApplicationExitCode = (int)ApplicationExitCode.CantWriteToApplicationLog;
}
// Persist application state
try
{
PersistApplicationState();
}
catch
{
// Update exit code to reflect failure to persist application state
e.ApplicationExitCode = (int)ApplicationExitCode.CantPersistApplicationState;
}
}
void WriteApplicationLogEntry(string message, int exitCode)
{
// Write log entry to file in isolated storage for the user
IsolatedStorageFile store = IsolatedStorageFile.GetUserStoreForAssembly();
using (Stream stream = new IsolatedStorageFileStream("log.txt", FileMode.Append, FileAccess.Write, store))
using (StreamWriter writer = new StreamWriter(stream))
{
string entry = string.Format("{0}: {1} - {2}", message, exitCode, DateTime.Now);
writer.WriteLine(entry);
}
}
void PersistApplicationState()
{
// Persist application state to file in isolated storage for the user
IsolatedStorageFile store = IsolatedStorageFile.GetUserStoreForAssembly();
using (Stream stream = new IsolatedStorageFileStream("state.txt", FileMode.Create, store))
using (StreamWriter writer = new StreamWriter(stream))
{
foreach (DictionaryEntry entry in this.Properties)
{
writer.WriteLine(entry.Value);
}
}
}
}
}
Imports System.Collections
Imports System.Windows
Imports System.IO
Imports System.IO.IsolatedStorage
Namespace VisualBasic
Public Enum ApplicationExitCode
Success = 0
Failure = 1
CantWriteToApplicationLog = 2
CantPersistApplicationState = 3
End Enum
Partial Public Class App
Inherits Application
Private Sub App_Exit(ByVal sender As Object, ByVal e As ExitEventArgs)
Try
' Write entry to application log
If e.ApplicationExitCode = CInt(ApplicationExitCode.Success) Then
WriteApplicationLogEntry("Failure", e.ApplicationExitCode)
Else
WriteApplicationLogEntry("Success", e.ApplicationExitCode)
End If
Catch
' Update exit code to reflect failure to write to application log
e.ApplicationExitCode = CInt(ApplicationExitCode.CantWriteToApplicationLog)
End Try
' Persist application state
Try
PersistApplicationState()
Catch
' Update exit code to reflect failure to persist application state
e.ApplicationExitCode = CInt(ApplicationExitCode.CantPersistApplicationState)
End Try
End Sub
Private Sub WriteApplicationLogEntry(ByVal message As String, ByVal exitCode As Integer)
' Write log entry to file in isolated storage for the user
Dim store As IsolatedStorageFile = IsolatedStorageFile.GetUserStoreForAssembly()
Using stream As Stream = New IsolatedStorageFileStream("log.txt", FileMode.Append, FileAccess.Write, store)
Using writer As New StreamWriter(stream)
Dim entry As String = String.Format("{0}: {1} - {2}", message, exitCode, Date.Now)
writer.WriteLine(entry)
End Using
End Using
End Sub
Private Sub PersistApplicationState()
' Persist application state to file in isolated storage for the user
Dim store As IsolatedStorageFile = IsolatedStorageFile.GetUserStoreForAssembly()
Using stream As Stream = New IsolatedStorageFileStream("state.txt", FileMode.Create, store)
Using writer As New StreamWriter(stream)
For Each entry As DictionaryEntry In Me.Properties
writer.WriteLine(entry.Value)
Next entry
End Using
End Using
End Sub
End Class
End Namespace
備註
應用程式可能因以下任一原因而關閉：
Shutdown物件的方法Application被呼叫，可以是明確地呼叫，也可以依屬性ShutdownMode決定。
使用者透過登出或關閉來結束會話。
你可以透過處理 Exit 事件來偵測應用程式關閉，並依需求執行額外處理。
你也可以在 Exit 不需要明確呼叫 Shutdown 時檢查或更改應用程式的退出碼。 退出碼是從ApplicationExitCode傳遞給Exit事件處理器的參數屬性ExitEventArgs中揭露的。 當應用程式停止執行時，退出碼會傳給作業系統進行後續處理。
如果你的應用程式處理了事件 SessionEnding 並隨後取消， Exit 則不會被觸發，應用程式會依照關機模式繼續運行。
退出碼可由 XAML 瀏覽器應用程式（XBAP）設定，但該值會被忽略。
對於 XBAP 來說， Exit 在以下情況下會被提出：
- XBAP 會被導向遠離。
- 當主機 XBAP 的瀏覽器分頁關閉時，
- 當瀏覽器關閉時。
在所有情況下，房產的價值 ApplicationExitCode 都被忽略了。
欲了解更多關於 XBAP 支援的資訊，請參閱 關於 WPF 瀏覽器託管應用程式（XBAP）的常見問題。
