FileInfo.CopyTo Metoda

Reference

Definice

Obor názvů:: System.IO

Sestavení:: mscorlib.dll, System.IO.FileSystem.dll

Sestavení:: System.IO.FileSystem.dll

Sestavení:: System.Runtime.dll

Sestavení:: mscorlib.dll

Sestavení:: netstandard.dll

Důležité

Některé informace platí pro předběžně vydaný produkt, který se může zásadně změnit, než ho výrobce nebo autor vydá. Microsoft neposkytuje žádné záruky, výslovné ani předpokládané, týkající se zde uváděných informací.

Zkopíruje existující soubor do nového souboru.

Přetížení

CopyTo(String)	Zkopíruje existující soubor do nového souboru a zakáže přepsání existujícího souboru.
CopyTo(String, Boolean)	Zkopíruje existující soubor do nového souboru a umožní přepsání existujícího souboru.

CopyTo(String)

Zdroj:: FileInfo.cs

Zdroj:: FileInfo.cs

Zdroj:: FileInfo.cs

Zkopíruje existující soubor do nového souboru a zakáže přepsání existujícího souboru.

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

Název nového souboru, do který chcete zkopírovat.

Návraty

FileInfo

Nový soubor s plně kvalifikovanou cestou.

Výjimky

ArgumentException

Verze .NET Framework a .NET Core starší než 2.1: destFileName jsou prázdné, obsahují pouze prázdné znaky nebo obsahují neplatné znaky.

IOException

Dojde k chybě nebo cílový soubor již existuje.

SecurityException

Volající nemá požadované oprávnění.

ArgumentNullException

destFileName je null.

UnauthorizedAccessException

Předá se cesta k adresáři nebo se soubor přesouvá na jinou jednotku.

DirectoryNotFoundException

Adresář zadaný v destFileName neexistuje.

PathTooLongException

Zadaná cesta, název souboru nebo obojí překračují maximální délku definovanou systémem.

NotSupportedException

destFileName obsahuje dvojtečku (:) v řetězci, ale neurčuje svazek.

Příklady

Následující příklad ukazuje obě přetížení CopyTo metody.

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

Následující příklad ukazuje kopírování jednoho souboru do jiného souboru, vyvolá výjimku, pokud cílový soubor již existuje.

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...

Poznámky

CopyTo(String, Boolean) Pomocí metody povolte přepsání existujícího souboru.

Upozornění

Pokud je to možné, nepoužívejte u této metody krátké názvy souborů (například XXXXXX~1.XXX). Pokud dva soubory mají ekvivalentní krátké názvy souborů, může tato metoda selhat a vyvolat výjimku nebo vést k nežádoucímu chování.

Viz také

Platí pro

CopyTo(String, Boolean)

Zdroj:: FileInfo.cs

Zdroj:: FileInfo.cs

Zdroj:: FileInfo.cs

Zkopíruje existující soubor do nového souboru a umožní přepsání existujícího souboru.

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

Název nového souboru, do který chcete zkopírovat.

overwrite: Boolean

trueumožnit přepsání existujícího souboru; v opačném případě . false

Návraty

FileInfo

Nový soubor nebo přepsání existujícího souboru, pokud overwrite je true. Pokud soubor existuje a overwrite je false, vyvolá se .IOException

Výjimky

ArgumentException

Verze .NET Framework a .NET Core starší než 2.1: destFileName jsou prázdné, obsahují pouze prázdné znaky nebo obsahují neplatné znaky.

IOException

Dojde k chybě nebo cílový soubor již existuje a overwrite je false.

SecurityException

Volající nemá požadované oprávnění.

ArgumentNullException

destFileName je null.

DirectoryNotFoundException

Adresář zadaný v destFileName neexistuje.

UnauthorizedAccessException

Předá se cesta k adresáři nebo se soubor přesouvá na jinou jednotku.

PathTooLongException

Zadaná cesta, název souboru nebo obojí překračují maximální délku definovanou systémem.

NotSupportedException

destFileName obsahuje dvojtečku (:) uprostřed řetězce.

Příklady

Následující příklad ukazuje obě přetížení CopyTo metody.

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

Následující příklad ukazuje kopírování jednoho souboru do jiného souboru a určuje, zda se má přepsat soubor, který již existuje.

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...
'

Poznámky

Tuto metodu použijte k povolení nebo zabránění přepsání existujícího souboru. CopyTo(String) Pomocí metody můžete ve výchozím nastavení zabránit přepsání existujícího souboru.

Upozornění

Viz také

Platí pro

Sdílet prostřednictvím

FileInfo.CopyTo Metoda

Definice

Přetížení

CopyTo(String)

Parametry

Návraty

Výjimky

Příklady

Poznámky

Viz také

Platí pro

CopyTo(String, Boolean)

Parametry

Návraty

Výjimky

Příklady

Poznámky

Viz také

Platí pro

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