FileInfo.CopyTo FileInfo.CopyTo FileInfo.CopyTo FileInfo.CopyTo Method

Definition

Kopiert eine vorhandene Datei in eine neue Datei.Copies an existing file to a new file.

Überlädt

CopyTo(String) CopyTo(String) CopyTo(String) CopyTo(String)

Kopiert eine vorhandene Datei in eine neue Datei, ohne das Überschreiben einer vorhandenen Datei zuzulassen.Copies an existing file to a new file, disallowing the overwriting of an existing file.

CopyTo(String, Boolean) CopyTo(String, Boolean) CopyTo(String, Boolean) CopyTo(String, Boolean)

Kopiert eine vorhandene Datei in eine neue Datei und lässt das Überschreiben einer vorhandenen Datei zu.Copies an existing file to a new file, allowing the overwriting of an existing file.

CopyTo(String) CopyTo(String) CopyTo(String) CopyTo(String)

Kopiert eine vorhandene Datei in eine neue Datei, ohne das Überschreiben einer vorhandenen Datei zuzulassen.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

Parameter

destFileName
String String String String

Der Name der neuen Datei, in die kopiert werden soll.The name of the new file to copy to.

Gibt zurück

Eine neue Datei mit einem vollqualifizierten Pfad.A new file with a fully qualified path.

Ausnahmen

destFileName ist leer, enthält nur Leerzeichen oder ungültige Zeichen.destFileName is empty, contains only white spaces, or contains invalid characters.

Ein Fehler tritt auf, oder die Zieldatei ist bereits vorhanden.An error occurs, or the destination file already exists.

Der Aufrufer verfügt nicht über die erforderliche Berechtigung.The caller does not have the required permission.

Ein Verzeichnispfad wird an ein anderes Laufwerk übergeben, oder die Datei wird auf ein anderes Laufwerk verschoben.A directory path is passed in, or the file is being moved to a different drive.

Das in destFileName angegebene Verzeichnis ist nicht vorhanden.The directory specified in destFileName does not exist.

Der angegebene Pfad und/oder Dateiname überschreiten die vom System definierte maximale Länge.The specified path, file name, or both exceed the system-defined maximum length.

destFileName enthält einen Doppelpunkt (:) in der Zeichenfolge, gibt aber kein Volume an.destFileName contains a colon (:) within the string but does not specify the volume.

Beispiele

Im folgenden Beispiel werden beide über Ladungen CopyTo der-Methode veranschaulicht.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

Im folgenden Beispiel wird veranschaulicht, wie Sie eine Datei in eine andere Datei kopieren und eine Ausnahme auslösen, wenn die Zieldatei bereits vorhanden ist.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 'CopyToTest
'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...

Hinweise

Verwenden Sie CopyTo(String, Boolean) die-Methode, um das Überschreiben einer vorhandenen Datei zuzulassen.Use the CopyTo(String, Boolean) method to allow overwriting of an existing file.

Achtung

Vermeiden Sie die Verwendung von kurzen Dateinamen (z. b. xxxxxx ~ 1. xxx) mit dieser Methode, wenn dies möglich ist.Whenever possible, avoid using short file names (such as XXXXXX~1.XXX) with this method. Wenn zwei Dateien über äquivalente kurze Dateinamen verfügen, schlägt diese Methode möglicherweise fehl, und es wird eine Ausnahme ausgelöst und/oder ein unerwünschtes Verhalten ergeben.If two files have equivalent short file names then this method may fail and raise an exception and/or result in undesirable behavior

Sicherheit

FileIOPermission
zum Lesen und Schreiben von Dateien.for reading and writing files. Zugehörige Enumerationen Read:,WriteAssociated enumerations: Read, Write

Siehe auch

CopyTo(String, Boolean) CopyTo(String, Boolean) CopyTo(String, Boolean) CopyTo(String, Boolean)

Kopiert eine vorhandene Datei in eine neue Datei und lässt das Überschreiben einer vorhandenen Datei zu.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

Parameter

destFileName
String String String String

Der Name der neuen Datei, in die kopiert werden soll.The name of the new file to copy to.

overwrite
Boolean Boolean Boolean Boolean

true, um das Überschreiben einer vorhandenen Datei zuzulassen, andernfalls false.true to allow an existing file to be overwritten; otherwise, false.

Gibt zurück

Eine neue Datei oder eine Überschreibung einer vorhandenen Datei, wenn overwrite true ist.A new file, or an overwrite of an existing file if overwrite is true. Wenn die Datei vorhanden und overwrite false ist, wird eine IOException ausgelöst.If the file exists and overwrite is false, an IOException is thrown.

Ausnahmen

destFileName ist leer, enthält nur Leerzeichen oder ungültige Zeichen.destFileName is empty, contains only white spaces, or contains invalid characters.

Ein Fehler tritt auf, oder die Zieldatei ist bereits vorhanden, und overwrite ist false.An error occurs, or the destination file already exists and overwrite is false.

Der Aufrufer verfügt nicht über die erforderliche Berechtigung.The caller does not have the required permission.

Das in destFileName angegebene Verzeichnis ist nicht vorhanden.The directory specified in destFileName does not exist.

Ein Verzeichnispfad wird an ein anderes Laufwerk übergeben, oder die Datei wird auf ein anderes Laufwerk verschoben.A directory path is passed in, or the file is being moved to a different drive.

Der angegebene Pfad und/oder Dateiname überschreiten die vom System definierte maximale Länge.The specified path, file name, or both exceed the system-defined maximum length.

destFileName enthält einen Doppelpunkt (:) innerhalb der Zeichenfolge.destFileName contains a colon (:) in the middle of the string.

Beispiele

Im folgenden Beispiel werden beide über Ladungen CopyTo der-Methode veranschaulicht.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

Im folgenden Beispiel wird veranschaulicht, wie Sie eine Datei in eine andere Datei kopieren und angeben, ob eine bereits vorhandene Datei überschrieben werden soll.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 'CopyToTest
'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...
'

Hinweise

Verwenden Sie diese Methode, um das Überschreiben einer vorhandenen Datei zuzulassen oder zu verhindern.Use this method to allow or prevent overwriting of an existing file. Verwenden Sie CopyTo(String) die-Methode, um zu verhindern, dass standardmäßig eine vorhandene Datei überschrieben wird.Use the CopyTo(String) method to prevent overwriting of an existing file by default.

Achtung

Vermeiden Sie die Verwendung von kurzen Dateinamen (z. b. xxxxxx ~ 1. xxx) mit dieser Methode, wenn dies möglich ist.Whenever possible, avoid using short file names (such as XXXXXX~1.XXX) with this method. Wenn zwei Dateien über äquivalente kurze Dateinamen verfügen, schlägt diese Methode möglicherweise fehl, und es wird eine Ausnahme ausgelöst und/oder ein unerwünschtes Verhalten ergeben.If two files have equivalent short file names then this method may fail and raise an exception and/or result in undesirable behavior

Sicherheit

FileIOPermission
zum Lesen und Schreiben von Dateien.for reading and writing files. Zugehörige Enumerationen Read:,WriteAssociated enumerations: Read, Write

Siehe auch

Gilt für: