FileInfo.CopyTo Metodo

Definizione

Spazio dei nomi:: System.IO

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

Assembly:: netstandard.dll, System.Runtime.dll

Assembly:: netstandard.dll, System.IO.FileSystem.dll

Assembly:: netstandard.dll, System.IO.FileSystem.dll, System.Runtime.dll

Assembly:: System.IO.FileSystem.dll

Assembly:: mscorlib.dll

Assembly:: netstandard.dll

Importante

Alcune informazioni sono relative alla release non definitiva del prodotto, che potrebbe subire modifiche significative prima della release definitiva. Microsoft non riconosce alcuna garanzia, espressa o implicita, in merito alle informazioni qui fornite.

Copia un file esistente in un nuovo file.

Overload

Nome	Descrizione
CopyTo(String)	Copia un file esistente in un nuovo file, non consentendo la sovrascrittura di un file esistente.
CopyTo(String, Boolean)	Copia un file esistente in un nuovo file, consentendo la sovrascrittura di un file esistente.

CopyTo(String)

Origine:: FileInfo.cs

Origine:: FileInfo.cs

Origine:: FileInfo.cs

Origine:: FileInfo.cs

Origine:: FileInfo.cs

Copia un file esistente in un nuovo file, non consentendo la sovrascrittura di un file esistente.

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

Parametri

destFileName: String

Nome del nuovo file in cui eseguire la copia.

Valori restituiti

FileInfo

Nuovo file con un percorso completo.

Eccezioni

ArgumentException

.NET Framework e versioni .NET Core precedenti alla 2.1: destFileName è vuoto, contiene solo spazi vuoti o contiene caratteri non validi.

IOException

Si verifica un errore o il file di destinazione esiste già.

SecurityException

Il chiamante non dispone dell'autorizzazione richiesta.

ArgumentNullException

destFileName è null.

UnauthorizedAccessException

Viene passato un percorso di directory o il file viene spostato in un'unità diversa.

DirectoryNotFoundException

La directory specificata in destFileName non esiste.

PathTooLongException

Il percorso, il nome file specificato o entrambi superano la lunghezza massima definita dal sistema.

NotSupportedException

destFileName contiene due punti (:) all'interno della stringa, ma non specifica il volume.

Esempio

Nell'esempio seguente vengono illustrati entrambi gli overload del CopyTo metodo .

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

Nell'esempio seguente viene illustrata la copia di un file in un altro file, generando un'eccezione se il file di destinazione esiste già.

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...

Commenti

Utilizzare il CopyTo(String, Boolean) metodo per consentire la sovrascrittura di un file esistente.

Attenzione

Quando possibile, evitare di usare nomi di file brevi (ad esempio XXXXXX~1.XXX) con questo metodo. Se due file hanno nomi di file brevi equivalenti, questo metodo potrebbe non riuscire e generare un'eccezione e/o comportare un comportamento indesiderato

Vedi anche

Si applica a

CopyTo(String, Boolean)

Origine:: FileInfo.cs

Origine:: FileInfo.cs

Origine:: FileInfo.cs

Origine:: FileInfo.cs

Origine:: FileInfo.cs

Copia un file esistente in un nuovo file, consentendo la sovrascrittura di un file esistente.

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

Parametri

destFileName: String

Nome del nuovo file in cui eseguire la copia.

overwrite: Boolean

true per consentire la sovrascrittura di un file esistente; in caso contrario, false.

Valori restituiti

FileInfo

Un nuovo file o una sovrascrittura di un file esistente se overwrite è true. Se il file esiste e overwrite è false, viene generata un'eccezione IOException .

Eccezioni

ArgumentException

.NET Framework e versioni .NET Core precedenti alla 2.1: destFileName è vuoto, contiene solo spazi vuoti o contiene caratteri non validi.

IOException

Si verifica un errore oppure il file di destinazione esiste già e overwrite è false.

SecurityException

Il chiamante non dispone dell'autorizzazione richiesta.

ArgumentNullException

destFileName è null.

DirectoryNotFoundException

La directory specificata in destFileName non esiste.

UnauthorizedAccessException

Viene passato un percorso di directory o il file viene spostato in un'unità diversa.

PathTooLongException

Il percorso, il nome file specificato o entrambi superano la lunghezza massima definita dal sistema.

NotSupportedException

destFileName contiene due punti (:) al centro della stringa.

Esempio

Nell'esempio seguente vengono illustrati entrambi gli overload del CopyTo metodo .

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

Nell'esempio seguente viene illustrata la copia di un file in un altro file, specificando se sovrascrivere un file già esistente.

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...
'

Commenti

Utilizzare questo metodo per consentire o impedire la sovrascrittura di un file esistente. Utilizzare il CopyTo(String) metodo per impedire la sovrascrittura di un file esistente per impostazione predefinita.

Attenzione

Vedi anche

Si applica a

Commenti e suggerimenti

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