VB.NET FileInfo.MoveTo方法代码示例

' 导入命名空间
Imports System.IO
Imports System.Text
Imports System.Text.RegularExpressions
Imports System.Xml

Module Program

    Private sourcePath As String = Environment.GetFolderPath _
    (Environment.SpecialFolder.MyDocuments) & _
    "\FileInfoTestDirectory\MoveFrom\FromFile.xml"
    '
    Private destPath As String = Environment.GetFolderPath _
    (Environment.SpecialFolder.MyDocuments) & _
    "\FileInfoTestDirectory\DestFile.xml"
    '
    ' The main entry point for the application.
    '
    <STAThread()> Sub Main()
        ' Change Console properties to make it obvious that 
        ' the application is starting.
        Console.Clear()
        ' Move it to the upper left corner of the screen.
        Console.SetWindowPosition(0, 0)
        ' Make it very large.
        Console.SetWindowSize(Console.LargestWindowWidth - 24, _
            Console.LargestWindowHeight - 16)
        Console.WriteLine("Welcome.")
        Console.WriteLine("This application demonstrates the FileInfo.MoveTo method.")
        Console.WriteLine("Press any key to start.")
        Dim s As String = Console.ReadLine()
        Console.Write("    Checking whether ")
        Console.Write(sourcePath)
        Console.WriteLine(" exists.")
        Dim fInfo As FileInfo = New FileInfo(sourcePath)
        EnsureSourceFileExists()
        DisplayFileProperties(fInfo)
        Console.WriteLine("Preparing to move the file to ")
        Console.Write(destPath)
        Console.WriteLine(".")
        MoveFile(fInfo)
        DisplayFileProperties(fInfo)
        Console.WriteLine("Preparing to delete directories.")
        DeleteFiles()
        Console.WriteLine("Press the ENTER key to close this application.")
        s = Console.ReadLine()
    End Sub
    '
    ' Moves the supplied FileInfo instance to destPath.
    '
    Private Sub MoveFile(ByVal fInfo As FileInfo)
        Try
            fInfo.MoveTo(destPath)
            Console.WriteLine("File moved to ")
            Console.WriteLine(destPath)
        Catch ex As Exception
            DisplayException(ex)
        End Try
    End Sub
    '
    ' Ensures that the test directories 
    ' and the file FromFile.xml all exist.
    '
    Private Sub EnsureSourceFileExists()
        ' Create a FileInfo instance, and get the full path 
        ' to the parent directory.
        Dim fInfo As FileInfo = New FileInfo(sourcePath)
        Dim dirPath As String = fInfo.Directory.FullName
        ' If the directory does not exist, create it.
        If Not Directory.Exists(dirPath) Then
            Directory.CreateDirectory(dirPath)
        End If
        ' If DestFile.xml exists, delete it.
        If File.Exists(destPath) Then
            File.Delete(destPath)
        End If
        Console.Write("Creating file ")
        Console.Write(fInfo.FullName)
        Console.WriteLine(".")
        Try
            If Not fInfo.Exists Then
                ' Call WriteFileContent to create the file.
                Console.WriteLine("Adding data to the file.")
                WriteFileContent(10)
                Console.WriteLine("Successfully created the file.")
            End If
        Catch ex As Exception
            DisplayException(ex)
        Finally
            dirPath = Nothing
            fInfo = Nothing
        End Try
    End Sub
    '
    ' Creates and saves an Xml file to sourcePath.
    '
    Private Sub WriteFileContent(ByVal totalElements As Integer)
        Dim doc As New XmlDocument()
        doc.PreserveWhitespace = True
        doc.AppendChild(doc.CreateXmlDeclaration("1.0", Nothing, "yes"))
        doc.AppendChild(doc.CreateWhitespace(ControlChars.CrLf))
        Dim root As XmlElement = doc.CreateElement("FileInfo.MoveTo")
        Dim index As Integer = 0
        Dim elem As XmlElement
        While index < totalElements
            elem = doc.CreateElement("MyElement")
            elem.SetAttribute("Index", index.ToString())
            elem.AppendChild(doc.CreateWhitespace(ControlChars.CrLf))
            elem.AppendChild(doc.CreateTextNode(String.Format _
             ("MyElement at position {0}.", index)))
            elem.AppendChild(doc.CreateWhitespace(ControlChars.CrLf))
            root.AppendChild(elem)
            index += 1
        End While
        doc.AppendChild(root)
        doc.AppendChild(doc.CreateWhitespace(ControlChars.CrLf))
        doc.Save(sourcePath)
    End Sub
    '
    ' Displays FullName, CreationTime, and LastWriteTime of the supplied
    ' FileInfo instance, then displays the text of the file.
    '
    Private Sub DisplayFileProperties(ByVal fInfo As FileInfo)
        Console.WriteLine("The FileInfo instance shows these property values.")
        Dim reader As StreamReader = Nothing
        Try
            Console.Write("FullName: ")
            Console.WriteLine(fInfo.FullName)
            Console.Write("CreationTime: ")
            Console.WriteLine(fInfo.CreationTime)
            Console.Write("LastWriteTime: ")
            Console.WriteLine(fInfo.LastWriteTime)
            Console.WriteLine()
            Console.WriteLine("File contents:")
            Console.WriteLine()
            reader = New StreamReader(fInfo.FullName)
            While Not reader.EndOfStream
                Console.WriteLine(reader.ReadLine())
            End While
            Console.WriteLine()
        Catch ex As Exception
            DisplayException(ex)
        Finally
            If Not reader Is Nothing Then
                reader.Close()
                reader = Nothing
            End If
        End Try
    End Sub
    '
    ' Deletes the test directory and all its files and subdirectories.
    '
    Private Sub DeleteFiles()
        Try
            Dim dInfo As DirectoryInfo = New DirectoryInfo(Environment.GetFolderPath _
              (Environment.SpecialFolder.MyDocuments) + "\FileInfoTestDirectory")
            If dInfo.Exists Then
                dInfo.Delete(True)
                Console.WriteLine("Successfully deleted directories and files.")
            End If
            dInfo = Nothing
        Catch ex As Exception
            DisplayException(ex)
        End Try
    End Sub
    '
    ' Displays information about the supplied Exception. This
    ' code is not suitable for production applications.
    '
    Private Sub DisplayException(ByVal ex As Exception)
        Dim sb As New StringBuilder("An exception of type """)
        sb.Append(ex.GetType().FullName)
        sb.Append(""" has occurred.")
        sb.Append(ControlChars.CrLf)
        sb.Append(ex.Message)
        sb.Append(ControlChars.CrLf)
        sb.Append("Stack trace information:")
        sb.Append(ControlChars.CrLf)
        Dim matchCol As MatchCollection = Regex.Matches(ex.StackTrace, _
        "(at\s)(.+)(\.)([^\.]*)(\()([^\)]*)(\))((\sin\s)(.+)(:line )([\d]*))?")
        Dim L As Integer = matchCol.Count
        Dim y, K As Integer
        Dim argList() As String
        Dim matchObj As Match
        Dim x As Integer = 0
        While x < L
            matchObj = matchCol(x)
            sb.Append(ControlChars.CrLf)
            sb.Append(ControlChars.CrLf)
            sb.Append(matchObj.Result("$1 $2$3$4$5"))
            argList = matchObj.Groups(6).Value.Split(New Char() {","})
            K = argList.Length
            y = 0
            While y < K
                sb.Append(ControlChars.CrLf)
                sb.Append("    ")
                sb.Append(argList(y).Trim().Replace(" ", "        "))
                sb.Append(",")
                y += 1
            End While
            sb.Remove(sb.Length - 1, 1)
            sb.Append(ControlChars.CrLf)
            If 0 < matchObj.Groups(8).Length Then
                sb.Append(ControlChars.CrLf)
                sb.Append(matchObj.Result("$10"))
                sb.Append(ControlChars.CrLf)
                sb.Append(matchObj.Result("line $12"))
            End If
            x += 1
        End While
        argList = Nothing
        matchObj = Nothing
        matchCol = Nothing
        Console.WriteLine(sb.ToString())
        sb = Nothing
        Return
    End Sub
End Module

' Welcome.
' This application demonstrates the FileInfo.MoveTo method.
' Press any key to start.
' 
'     Checking whether C:\Documents and Settings\MyComputer\My Documents\FileInfoTestDirectory\MoveFrom\FromFile.xml exists.
' Creating file C:\Documents and Settings\MyComputer\My Documents\FileInfoTestDirectory\MoveFrom\FromFile.xml.
' Adding data to the file.
' Successfully created the file.
' The FileInfo instance shows these property values.
' FullName: C:\Documents and Settings\MyComputer\My Documents\FileInfoTestDirectory\MoveFrom\FromFile.xml
' CreationTime: 4/18/2006 1:38:19 PM
' LastWriteTime: 4/18/2006 1:38:19 PM
' 
' File contents:
' 
' <?xml version="1.0" standalone="yes"?>
' <FileInfo.MoveTo><MyElement Index="0">
' MyElement at position 0.
' </MyElement><MyElement Index="1">
' MyElement at position 1.
' </MyElement><MyElement Index="2">
' MyElement at position 2.
' </MyElement><MyElement Index="3">
' MyElement at position 3.
' </MyElement><MyElement Index="4">
' MyElement at position 4.
' </MyElement><MyElement Index="5">
' MyElement at position 5.
' </MyElement><MyElement Index="6">
' MyElement at position 6.
' </MyElement><MyElement Index="7">
' MyElement at position 7.
' </MyElement><MyElement Index="8">
' MyElement at position 8.
' </MyElement><MyElement Index="9">
' MyElement at position 9.
' </MyElement></FileInfo.MoveTo>
' 
' Preparing to move the file to
' C:\Documents and Settings\MyComputer\My Documents\FileInfoTestDirectory\DestFile.xml.
' File moved to
' C:\Documents and Settings\MyComputer\My Documents\FileInfoTestDirectory\DestFile.xml
' The FileInfo instance shows these property values.
' FullName: C:\Documents and Settings\MyComputer\My Documents\FileInfoTestDirectory\DestFile.xml
' CreationTime: 4/18/2006 1:38:19 PM
' LastWriteTime: 4/18/2006 1:38:19 PM
' 
' File contents:
' 
' <?xml version="1.0" standalone="yes"?>
' <FileInfo.MoveTo><MyElement Index="0">
' MyElement at position 0.
' </MyElement><MyElement Index="1">
' MyElement at position 1.
' </MyElement><MyElement Index="2">
' MyElement at position 2.
' </MyElement><MyElement Index="3">
' MyElement at position 3.
' </MyElement><MyElement Index="4">
' MyElement at position 4.
' </MyElement><MyElement Index="5">
' MyElement at position 5.
' </MyElement><MyElement Index="6">
' MyElement at position 6.
' </MyElement><MyElement Index="7">
' MyElement at position 7.
' </MyElement><MyElement Index="8">
' MyElement at position 8.
' </MyElement><MyElement Index="9">
' MyElement at position 9.
' </MyElement></FileInfo.MoveTo>
' 
' Preparing to delete directories.
' Successfully deleted directories and files.
' Press the ENTER key to close this application.