Question

我在我的应用程序中使用此代码来管理文件夹：

Dim appBasePath As String = Application.StartupPath() 
Dim appPath As String = appBasePath & "\user"   
Private WithEvents FSW As New IO.FileSystemWatcher(appPath)

但是如果路径不存在，则应用程序会抛出此异常：

Exception thrown: 'System.ArgumentException' in System.dll

Additional information: The directory name c:\program\user is invalid.

而且：

An exception of type 'System.ArgumentException' occurred in System.dll but was not handled in user code

Additional information: The directory name c:\program\user is invalid.

我该如何处理这个例外？

Answer 1

处理异常的一种方法是在方法块中实例化对象，然后可以编写try / catch块。

一个例子：

Imports System.IO

Public Class Form1 : Inherits Form

    Dim appBasePath As String = Application.StartupPath()
    Dim appPath As String = appBasePath & "\user"

    Friend WithEvents Fsw As FileSystemWatcher

    Public Sub New()

        ' This call is required by the designer.
        MyClass.InitializeComponent()

        ' Add any initialization after the InitializeComponent() call.
        Try
            Me.Fsw = New FileSystemWatcher(appPath)

        Catch ex As ArgumentException When (Not Directory.Exists(appPath))
        ' ...

        Catch ex As Exception
        ' ...

        End Try

    End Sub

End Class

如何处理异常System.ArgumentException

1 个答案: