FileInfo.MoveTo メソッドとは? わかりやすく解説

FileInfo.MoveTo メソッド

指定したファイル新しい場所に移動しますオプション新しファイル名指定することもできます

名前空間: System.IO
アセンブリ: mscorlib (mscorlib.dll 内)
構文構文

Public Sub MoveTo ( _
    destFileName As String _
)
Dim instance As FileInfo
Dim destFileName As String

instance.MoveTo(destFileName)
public void MoveTo (
    string destFileName
)
public:
void MoveTo (
    String^ destFileName
)
public void MoveTo (
    String destFileName
)
public function MoveTo (
    destFileName : String
)

パラメータ

destFileName

ファイル移動先のパス異なファイル名指定できます

例外例外
例外種類条件

IOException

I/O エラー発生しました移動先のファイルが既に存在するか、移動先のデバイス準備ができていない、などの原因考えられます。

ArgumentNullException

destFileNamenull 参照 (Visual Basic では Nothing) です。

ArgumentException

destFileName が空か、空白だけが含まれているか、または無効な文字含まれています。

SecurityException

呼び出し元に必要なアクセス許可がありません。

UnauthorizedAccessException

destFileName読み取り専用か、またはディレクトリです。

FileNotFoundException

ファイルが見つかりません。

DirectoryNotFoundException

割り当てられていないドライブであるなど、指定されパス無効です。

PathTooLongException

指定したパスファイル名、またはその両方システム定義の最大長を超えてます。たとえば、Windows ベースプラットフォーム場合パス長さ248 文字未満ファイル名長さ260 文字未満である必要があります

NotSupportedException

destFileName文字列中にコロン (:) が含まれています。

解説解説
使用例使用例

ファイル別の場所に移動し、そのファイルの名前を変更する例を次に示します

Imports System
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


using System;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.IO;
using System.Reflection;
using System.Security.Permissions;
using System.Text;
using System.Text.RegularExpressions;
using System.Xml;




namespace Microsoft.Samples.MoveTo.CS 
{

    class Program 
    {
        private static string
 sourcePath = Environment.GetFolderPath
            (Environment.SpecialFolder.MyDocuments) + 
            @"\FileInfoTestDirectory\MoveFrom\FromFile.xml";
        
        private static string
 destPath = Environment.GetFolderPath
            (Environment.SpecialFolder.MyDocuments) + 
            @"\FileInfoTestDirectory\DestFile.xml";
        //
        // The main entry point for the application.
        //
        [STAThread()] static void 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.");
            string s = Console.ReadLine();
            Console.Write("    Checking whether ");
            Console.Write(sourcePath);
            Console.WriteLine(" exists.");
            FileInfo fInfo = 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();
        }
        //
        // Moves the supplied FileInfo instance to destPath.
        //
        private static void
 MoveFile(FileInfo fInfo) 
        {
            try 
            {
                fInfo.MoveTo(destPath);
                Console.WriteLine("File moved to ");
                Console.WriteLine(destPath);
            } catch (Exception ex) {
                DisplayException(ex);
            }
        }
        //
        // Ensures that the test directories 
        // and the file FromFile.xml all exist.
        // 
        private static void
 EnsureSourceFileExists() 
        {
            FileInfo fInfo = new FileInfo(sourcePath);
            string dirPath = fInfo.Directory.FullName;
            if (!Directory.Exists(dirPath)) 
            {
                Directory.CreateDirectory(dirPath);
            }
            if (File.Exists(destPath)) 
            {
                File.Delete(destPath);
            }
            Console.Write("Creating file ");
            Console.Write(fInfo.FullName);
            Console.WriteLine(".");
            try 
            {
                if (!fInfo.Exists) 
                {
                    Console.WriteLine("Adding data to the file.");
                    WriteFileContent(10);
                    Console.WriteLine("Successfully created the file.");
                }
            } 
            catch (Exception ex) 
            {
                DisplayException(ex);
            } 
            finally 
            {
                dirPath = null;
            }
        }
        //
        // Creates and saves an Xml file to sourcePath.
        //
        private static void
 WriteFileContent(int totalElements) 
        {
            XmlDocument doc = new XmlDocument();
            doc.PreserveWhitespace = true;
            doc.AppendChild(doc.CreateXmlDeclaration("1.0", null,
 "yes"));
            doc.AppendChild(doc.CreateWhitespace("\r\n"));
            XmlElement root = doc.CreateElement("FileInfo.MoveTo");
            root.AppendChild(doc.CreateWhitespace("\r\n"));
            int index = 0;
            XmlElement elem;
            while (index < totalElements) 
            {
                
                elem = doc.CreateElement("MyElement");
                elem.SetAttribute("Index", index.ToString());
                elem.AppendChild(doc.CreateWhitespace("\r\n"));
                elem.AppendChild(doc.CreateTextNode(String.Format
                    ("MyElement at position {0}.", index)));
                elem.AppendChild(doc.CreateWhitespace("\r\n"));
                root.AppendChild(elem);
                root.AppendChild(doc.CreateWhitespace("\r\n"));
                index++;
            }
            doc.AppendChild(root);
            doc.AppendChild(doc.CreateWhitespace("\r\n"));
            doc.Save(sourcePath);
            elem = null;
            root = null;
            doc = null;
        }
        //
        // Displays FullName, CreationTime, and LastWriteTime of the
 supplied
        // FileInfo instance, then displays the text of the file.
        //
        private static void
 DisplayFileProperties(FileInfo fInfo) 
        {
            Console.WriteLine("The FileInfo instance shows these property values.");
            StreamReader reader = null;
            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 (!reader.EndOfStream) 
                {
                    Console.WriteLine(reader.ReadLine());
                }
                Console.WriteLine();
            } 
            catch (Exception ex) 
            {
                DisplayException(ex);
            } 
            finally 
            {
                if (reader != null) 
                {
                    reader.Close();
                }
                reader = null;
            }
        }
        //
        // Deletes the test directory and all its files and subdirectories.
        //
        private static void
 DeleteFiles() 
        {
            try 
            {
                DirectoryInfo dInfo = new DirectoryInfo(Environment.GetFolderPath
                    (Environment.SpecialFolder.MyDocuments) + "\\FileInfoTestDirectory");
                if (dInfo.Exists) 
                {
                    dInfo.Delete(true);
                    Console.WriteLine("Successfully deleted directories and
 files.");
                }
                dInfo = null;
            } 
            catch (Exception ex) 
            {
                DisplayException(ex);
            }
        }
        //
        // Displays information about the supplied Exception. This
        // code is not suitable for production applications.
        //
        private static void
 DisplayException(Exception ex) 
        {
            StringBuilder sb = new StringBuilder();
            sb.Append("An exception of type \"");
            sb.Append(ex.GetType().FullName);
            sb.Append("\" has occurred.\r\n");
            sb.Append(ex.Message);
            sb.Append("\r\nStack trace information:\r\n");
            MatchCollection matchCol = Regex.Matches(ex.StackTrace,
@"(at\s)(.+)(\.)([^\.]*)(\()([^\)]*)(\))((\sin\s)(.+)(:line )([\d]*))?");
            int L = matchCol.Count;
            string[] argList;
            Match matchObj;
            int y, K;
            for(int x = 0; x < L; x++) 
            {
                matchObj = matchCol[x];
                sb.Append(matchObj.Result("\r\n\r\n$1 $2$3$4$5"));
                argList = matchObj.Groups[6].Value.Split(new char[]
 { ',' });
                K = argList.Length;
                for (y = 0; y < K; y++) 
                {
                    sb.Append("\r\n    ");
                    sb.Append(argList[y].Trim().Replace(" ", "   
     "));
                    sb.Append(',');
                }
                sb.Remove(sb.Length - 1, 1);
                sb.Append("\r\n)");
                if (0 < matchObj.Groups[8].Length) 
                {
                    sb.Append(matchObj.Result("\r\n$10\r\nline $12"));
                }
            }
            argList = null;
            matchObj = null;
            matchCol = null;
            Console.WriteLine(sb.ToString());
            sb = null;
        }
    }
}
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