FileInfo.CopyTo Metoda

Definicja

Kopiuje istniejący plik do nowego pliku.Copies an existing file to a new file.

Przeciążenia

CopyTo(String)

Kopiuje istniejący plik do nowego pliku, nie zezwalając na zastępowanie istniejącego pliku.Copies an existing file to a new file, disallowing the overwriting of an existing file.

CopyTo(String, Boolean)

Kopiuje istniejący plik do nowego pliku, umożliwiając zastępowanie istniejącego pliku.Copies an existing file to a new file, allowing the overwriting of an existing file.

CopyTo(String)

Kopiuje istniejący plik do nowego pliku, nie zezwalając na zastępowanie istniejącego pliku.Copies an existing file to a new file, disallowing the overwriting of an existing file.

public:
 System::IO::FileInfo ^ CopyTo(System::String ^ destFileName);
public System.IO.FileInfo CopyTo (string destFileName);
member this.CopyTo : string -> System.IO.FileInfo
Public Function CopyTo (destFileName As String) As FileInfo

Parametry

destFileName
String

Nazwa nowego pliku, do którego mają zostać skopiowane.The name of the new file to copy to.

Zwraca

Nowy plik z w pełni kwalifikowaną ścieżką.A new file with a fully qualified path.

Wyjątki

destFileName jest pusty, zawiera tylko spacje lub zawiera nieprawidłowe znaki.destFileName is empty, contains only white spaces, or contains invalid characters.

Wystąpił błąd lub plik docelowy już istnieje.An error occurs, or the destination file already exists.

Element wywołujący nie ma wymaganego uprawnienia.The caller does not have the required permission.

Parametr destFileName ma wartość null.destFileName is null.

Przekazanie ścieżki katalogu lub plik jest przenoszony na inny dysk.A directory path is passed in, or the file is being moved to a different drive.

Katalog określony w destFileName nie istnieje.The directory specified in destFileName does not exist.

Podana ścieżka, nazwa pliku lub obie przekraczają maksymalną długość zdefiniowaną przez system.The specified path, file name, or both exceed the system-defined maximum length.

destFileName zawiera dwukropek (:) w ciągu, ale nie określa woluminu.destFileName contains a colon (:) within the string but does not specify the volume.

Przykłady

Poniższy przykład ilustruje oba przeciążenia metody CopyTo.The following example demonstrates both overloads of the CopyTo method.

using namespace System;
using namespace System::IO;

int main()
{
   String^ path = "c:\\MyTest.txt";
   String^ path2 = "c:\\MyTest.txttemp";
   FileInfo^ fi1 = gcnew FileInfo( path );
   FileInfo^ fi2 = gcnew FileInfo( path2 );
   try
   {
      // Create the file and clean up handles.
      FileStream^ fs = fi1->Create();
      if ( fs )
         delete (IDisposable^)fs;
      
      //Ensure that the target does not exist.
      fi2->Delete();
      
      //Copy the file.
      fi1->CopyTo( path2 );
      Console::WriteLine( "{0} was copied to {1}.", path, path2 );
      
      //Try to copy it again, which should succeed.
      fi1->CopyTo( path2, true );
      Console::WriteLine( "The second Copy operation succeeded, which is expected." );
   }
   catch ( Exception^ ) 
   {
      Console::WriteLine( "Double copying was not allowed, which is not expected." );
   }
}
//This code produces output similar to the following; 
//results may vary based on the computer/file structure/etc.:
//
//The second Copy operation succeeded, which is expected.
using System;
using System.IO;

class Test
{

    public static void Main()
    {
        string path = @"c:\SoureFile.txt";
        string path2 = @"c:\NewFile.txt";
        FileInfo fi1 = new FileInfo(path);
        FileInfo fi2 = new FileInfo(path2);

        try
        {
            // Create the source file.
            using (FileStream fs = fi1.Create()) { }

            //Ensure that the target file does not exist.
            if (File.Exists(path2))
            {
                fi2.Delete();
            }

            //Copy the file.f
            fi1.CopyTo(path2);
            Console.WriteLine("{0} was copied to {1}.", path, path2);
        }
        catch (IOException ioex)
        {
            Console.WriteLine(ioex.Message);
        }
    }
}
Imports System.IO

Public Class Test

    Public Shared Sub Main()
        'Specify the directories you want to manipulate.
        Dim path As String = "c:\SourceFile.txt"
        Dim path2 As String = "c:\NewFile.txt"
        Dim fi As FileInfo = New FileInfo(path)
        Dim fi2 As FileInfo = New FileInfo(path2)

        Try
            Using fs As FileStream = fi.Create()
            End Using

            'Ensure that the target does not exist.
            If File.Exists(path2) Then
                fi2.Delete()
            End If
            
            'Copy the file.
            fi.CopyTo(path2)
            Console.WriteLine("{0} was copied to {1}.", path, path2)

        Catch ioex As IOException
            Console.WriteLine(ioex.Message)
        End Try
    End Sub
End Class

Poniższy przykład demonstruje kopiowanie jednego pliku do innego pliku, zwracając wyjątek, jeśli plik docelowy już istnieje.The following example demonstrates copying one file to another file, throwing an exception if the destination file already exists.

using namespace System;
using namespace System::IO;
int main()
{
   try
   {
      
      // Create a reference to a file, which might or might not exist.
      // If it does not exist, it is not yet created.
      FileInfo^ fi = gcnew FileInfo( "temp.txt" );
      
      // Create a writer, ready to add entries to the file.
      StreamWriter^ sw = fi->AppendText();
      sw->WriteLine( "Add as many lines as you like..." );
      sw->WriteLine( "Add another line to the output..." );
      sw->Flush();
      sw->Close();
      
      // Get the information out of the file and display it.
      StreamReader^ sr = gcnew StreamReader( fi->OpenRead() );
      Console::WriteLine( "This is the information in the first file:" );
      while ( sr->Peek() != -1 )
            Console::WriteLine( sr->ReadLine() );
      
      // Copy this file to another file. The file will not be overwritten if it already exists.
      FileInfo^ newfi = fi->CopyTo( "newTemp.txt" );
      
      // Get the information out of the new file and display it.* sr = new StreamReader(newfi->OpenRead());
      Console::WriteLine( "{0}This is the information in the second file:", Environment::NewLine );
      while ( sr->Peek() != -1 )
            Console::WriteLine( sr->ReadLine() );
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( e->Message );
   }

}
//This code produces output similar to the following; 
//results may vary based on the computer/file structure/etc.:
//
//This is the information in the first file:
//Add as many lines as you like...
//Add another line to the output...
//
//This is the information in the second file:

using System;
using System.IO;

public class CopyToTest 
{
    public static void Main() 
    {
        try
        {
            // Create a reference to a file, which might or might not exist.
            // If it does not exist, it is not yet created.
            FileInfo fi = new FileInfo("temp.txt");
            // Create a writer, ready to add entries to the file.
            StreamWriter sw = fi.AppendText();
            sw.WriteLine("Add as many lines as you like...");
            sw.WriteLine("Add another line to the output...");
            sw.Flush();
            sw.Close();
            // Get the information out of the file and display it.
            StreamReader sr = new StreamReader(fi.OpenRead());
            Console.WriteLine("This is the information in the first file:");
            while (sr.Peek() != -1)
                Console.WriteLine(sr.ReadLine());
            // Copy this file to another file. The file will not be overwritten if it already exists.
            FileInfo newfi = fi.CopyTo("newTemp.txt");
            // Get the information out of the new file and display it.
            sr = new StreamReader(newfi.OpenRead());
            Console.WriteLine("{0}This is the information in the second file:", Environment.NewLine);
            while (sr.Peek() != -1)
                Console.WriteLine(sr.ReadLine());
        }
        catch(Exception e)
        {
            Console.WriteLine(e.Message);
        }
    }
}
//This code produces output similar to the following; 
//results may vary based on the computer/file structure/etc.:
//
//This is the information in the first file:
//Add as many lines as you like...
//Add another line to the output...

//This is the information in the second file:
//Add as many lines as you like...
//Add another line to the output...
Imports System.IO

Public Class CopyToTest
    Public Shared Sub Main()
        Try
            ' Create a reference to a file, which might or might not exist.
            ' If it does not exist, it is not yet created.
            Dim fi As New FileInfo("temp.txt")
            ' Create a writer, ready to add entries to the file.
            Dim sw As StreamWriter = fi.AppendText()
            sw.WriteLine("Add as many lines as you like...")
            sw.WriteLine("Add another line to the output...")
            sw.Flush()
            sw.Close()
            ' Get the information out of the file and display it.
            Dim sr As New StreamReader(fi.OpenRead())
            Console.WriteLine("This is the information in the first file:")
            While sr.Peek() <> -1
                Console.WriteLine(sr.ReadLine())
            End While
            ' Copy this file to another file.
            Dim newfi As FileInfo = fi.CopyTo("newTemp.txt")
            ' Get the information out of the new file and display it.
            sr = New StreamReader(newfi.OpenRead())
            Console.WriteLine("{0}This is the information in the second file:", Environment.NewLine)
            While sr.Peek() <> -1
                Console.WriteLine(sr.ReadLine())
            End While
        Catch e As Exception
            Console.WriteLine(e.Message)
        End Try
    End Sub
End Class
'This code produces output similar to the following; 
'results may vary based on the computer/file structure/etc.:
'
'This is the information in the first file:
'Add as many lines as you like...
'Add another line to the output...
'
'This is the information in the second file:
'Add as many lines as you like...
'Add another line to the output...

Uwagi

Użyj metody CopyTo(String, Boolean), aby umożliwić zastępowanie istniejącego pliku.Use the CopyTo(String, Boolean) method to allow overwriting of an existing file.

Przestroga

Jeśli to możliwe, Unikaj używania krótkich nazw plików (takich jak XXXXXX ~ 1. XXX) z tą metodą.Whenever possible, avoid using short file names (such as XXXXXX~1.XXX) with this method. Jeśli dwa pliki mają równoważne nazwy krótkich plików, ta metoda może się nie powieść i wywołać wyjątek i/lub spowodować niepożądane zachowanieIf two files have equivalent short file names then this method may fail and raise an exception and/or result in undesirable behavior

Zobacz też

CopyTo(String, Boolean)

Kopiuje istniejący plik do nowego pliku, umożliwiając zastępowanie istniejącego pliku.Copies an existing file to a new file, allowing the overwriting of an existing file.

public:
 System::IO::FileInfo ^ CopyTo(System::String ^ destFileName, bool overwrite);
public System.IO.FileInfo CopyTo (string destFileName, bool overwrite);
member this.CopyTo : string * bool -> System.IO.FileInfo
Public Function CopyTo (destFileName As String, overwrite As Boolean) As FileInfo

Parametry

destFileName
String

Nazwa nowego pliku, do którego mają zostać skopiowane.The name of the new file to copy to.

overwrite
Boolean

true, aby zezwolić na zastąpienie istniejącego pliku; w przeciwnym razie false.true to allow an existing file to be overwritten; otherwise, false.

Zwraca

Nowy plik lub zastąpienie istniejącego pliku, jeśli overwrite jest true.A new file, or an overwrite of an existing file if overwrite is true. Jeśli plik istnieje i overwrite jest false, zostanie zgłoszony IOException.If the file exists and overwrite is false, an IOException is thrown.

Wyjątki

destFileName jest pusty, zawiera tylko spacje lub zawiera nieprawidłowe znaki.destFileName is empty, contains only white spaces, or contains invalid characters.

Wystąpił błąd lub plik docelowy już istnieje i overwrite jest false.An error occurs, or the destination file already exists and overwrite is false.

Element wywołujący nie ma wymaganego uprawnienia.The caller does not have the required permission.

Parametr destFileName ma wartość null.destFileName is null.

Katalog określony w destFileName nie istnieje.The directory specified in destFileName does not exist.

Przekazanie ścieżki katalogu lub plik jest przenoszony na inny dysk.A directory path is passed in, or the file is being moved to a different drive.

Podana ścieżka, nazwa pliku lub obie przekraczają maksymalną długość zdefiniowaną przez system.The specified path, file name, or both exceed the system-defined maximum length.

destFileName zawiera dwukropek (:) w środku ciągu.destFileName contains a colon (:) in the middle of the string.

Przykłady

Poniższy przykład ilustruje oba przeciążenia metody CopyTo.The following example demonstrates both overloads of the CopyTo method.

using namespace System;
using namespace System::IO;

int main()
{
   String^ path = "c:\\MyTest.txt";
   String^ path2 = "c:\\MyTest.txttemp";
   FileInfo^ fi1 = gcnew FileInfo( path );
   FileInfo^ fi2 = gcnew FileInfo( path2 );
   try
   {
      // Create the file and clean up handles.
      FileStream^ fs = fi1->Create();
      if ( fs )
         delete (IDisposable^)fs;
      
      //Ensure that the target does not exist.
      fi2->Delete();
      
      //Copy the file.
      fi1->CopyTo( path2 );
      Console::WriteLine( "{0} was copied to {1}.", path, path2 );
      
      //Try to copy it again, which should succeed.
      fi1->CopyTo( path2, true );
      Console::WriteLine( "The second Copy operation succeeded, which is expected." );
   }
   catch ( Exception^ ) 
   {
      Console::WriteLine( "Double copying was not allowed, which is not expected." );
   }
}
//This code produces output similar to the following; 
//results may vary based on the computer/file structure/etc.:
//
//The second Copy operation succeeded, which is expected.
using System;
using System.IO;

class Test
{

    public static void Main()
    {
        string path = @"c:\SoureFile.txt";
        string path2 = @"c:\NewFile.txt";
        FileInfo fi1 = new FileInfo(path);
        FileInfo fi2 = new FileInfo(path2);

        try
        {
            // Create the source file.
            using (FileStream fs = fi1.Create()) { }

            //Ensure that the target file does not exist.
            if (File.Exists(path2))
            {
                fi2.Delete();
            }

            //Copy the file.f
            fi1.CopyTo(path2);
            Console.WriteLine("{0} was copied to {1}.", path, path2);
        }
        catch (IOException ioex)
        {
            Console.WriteLine(ioex.Message);
        }
    }
}
Imports System.IO

Public Class Test

    Public Shared Sub Main()
        'Specify the directories you want to manipulate.
        Dim path As String = "c:\SourceFile.txt"
        Dim path2 As String = "c:\NewFile.txt"
        Dim fi As FileInfo = New FileInfo(path)
        Dim fi2 As FileInfo = New FileInfo(path2)

        Try
            Using fs As FileStream = fi.Create()
            End Using

            'Ensure that the target does not exist.
            If File.Exists(path2) Then
                fi2.Delete()
            End If
            
            'Copy the file.
            fi.CopyTo(path2)
            Console.WriteLine("{0} was copied to {1}.", path, path2)

        Catch ioex As IOException
            Console.WriteLine(ioex.Message)
        End Try
    End Sub
End Class

Poniższy przykład demonstruje kopiowanie jednego pliku do innego pliku, określając, czy zastąpić plik, który już istnieje.The following example demonstrates copying one file to another file, specifying whether to overwrite a file that already exists.

using namespace System;
using namespace System::IO;
int main()
{
   
   // Create a reference to a file, which might or might not exist.
   // If it does not exist, it is not yet created.
   FileInfo^ fi = gcnew FileInfo( "temp.txt" );
   
   // Create a writer, ready to add entries to the file.
   StreamWriter^ sw = fi->AppendText();
   sw->WriteLine( "Add as many lines as you like..." );
   sw->WriteLine( "Add another line to the output..." );
   sw->Flush();
   sw->Close();
   
   // Get the information out of the file and display it.
   StreamReader^ sr = gcnew StreamReader( fi->OpenRead() );
   Console::WriteLine( "This is the information in the first file:" );
   while ( sr->Peek() != -1 )
      Console::WriteLine( sr->ReadLine() );

   
   // Copy this file to another file. The true parameter specifies
   // that the file will be overwritten if it already exists.
   FileInfo^ newfi = fi->CopyTo( "newTemp.txt", true );
   
   // Get the information out of the new file and display it.* sr = new StreamReader( newfi->OpenRead() );
   Console::WriteLine( "{0}This is the information in the second file:", Environment::NewLine );
   while ( sr->Peek() != -1 )
      Console::WriteLine( sr->ReadLine() );
}
//This code produces output similar to the following; 
//results may vary based on the computer/file structure/etc.:
//
//This is the information in the first file:
//Add as many lines as you like...
//Add another line to the output...
//This is the information in the second file:
//
using System;
using System.IO;

public class CopyToTest 
{
    public static void Main() 
    {
        // Create a reference to a file, which might or might not exist.
        // If it does not exist, it is not yet created.
        FileInfo fi = new FileInfo("temp.txt");
        // Create a writer, ready to add entries to the file.
        StreamWriter sw = fi.AppendText();
        sw.WriteLine("Add as many lines as you like...");
        sw.WriteLine("Add another line to the output...");
        sw.Flush();
        sw.Close();
        // Get the information out of the file and display it.
        StreamReader sr = new StreamReader( fi.OpenRead() );
        Console.WriteLine("This is the information in the first file:");
        while (sr.Peek() != -1)
            Console.WriteLine( sr.ReadLine() );
        // Copy this file to another file. The true parameter specifies
        // that the file will be overwritten if it already exists.
        FileInfo newfi = fi.CopyTo("newTemp.txt", true);
        // Get the information out of the new file and display it.
        sr = new StreamReader( newfi.OpenRead() );
        Console.WriteLine("{0}This is the information in the second file:", Environment.NewLine);
        while (sr.Peek() != -1)
            Console.WriteLine( sr.ReadLine() );
    }
}
//This code produces output similar to the following; 
//results may vary based on the computer/file structure/etc.:
//
//This is the information in the first file:
//Add as many lines as you like...
//Add another line to the output...
//Add as many lines as you like...
//Add another line to the output...

//This is the information in the second file:
//Add as many lines as you like...
//Add another line to the output...
//Add as many lines as you like...
//Add another line to the output...

Imports System.IO

Public Class CopyToTest
    Public Shared Sub Main()
        ' Create a reference to a file, which might or might not exist.
        ' If it does not exist, it is not yet created.
        Dim fi As New FileInfo("temp.txt")
        ' Create a writer, ready to add entries to the file.
        Dim sw As StreamWriter = fi.AppendText()
        sw.WriteLine("Add as many lines as you like...")
        sw.WriteLine("Add another line to the output...")
        sw.Flush()
        sw.Close()
        ' Get the information out of the file and display it.
        Dim sr As New StreamReader(fi.OpenRead())
        Console.WriteLine("This is the information in the first file:")
        While sr.Peek() <> -1
            Console.WriteLine(sr.ReadLine())
        End While
        ' Copy this file to another file. The true parameter specifies 
        ' that the file will be overwritten if it already exists.
        Dim newfi As FileInfo = fi.CopyTo("newTemp.txt", True)
        ' Get the information out of the new file and display it.
        sr = New StreamReader(newfi.OpenRead())
        Console.WriteLine("{0}This is the information in the second file:", Environment.NewLine)
        While sr.Peek() <> -1
            Console.WriteLine(sr.ReadLine())
        End While
    End Sub
End Class
'This code produces output similar to the following; 
'results may vary based on the computer/file structure/etc.:
'
'This is the information in the first file:
'Add as many lines as you like...
'Add another line to the output...
'
'This is the information in the second file:
'Add as many lines as you like...
'Add another line to the output...
'

Uwagi

Użyj tej metody, aby zezwolić lub zapobiec zastąpieniu istniejącego pliku.Use this method to allow or prevent overwriting of an existing file. Użyj metody CopyTo(String), aby uniemożliwić zastępowanie istniejącego pliku domyślnie.Use the CopyTo(String) method to prevent overwriting of an existing file by default.

Przestroga

Jeśli to możliwe, Unikaj używania krótkich nazw plików (takich jak XXXXXX ~ 1. XXX) z tą metodą.Whenever possible, avoid using short file names (such as XXXXXX~1.XXX) with this method. Jeśli dwa pliki mają równoważne nazwy krótkich plików, ta metoda może się nie powieść i wywołać wyjątek i/lub spowodować niepożądane zachowanieIf two files have equivalent short file names then this method may fail and raise an exception and/or result in undesirable behavior

Zobacz też

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