FileInfo.CopyTo メソッド
既存のファイルを新しいファイルにコピーします。
オーバーロードの一覧
既存のファイルを上書きできないようにして、既存のファイルを新しいファイルにコピーします。
.NET Compact Framework でもサポート。
[Visual Basic] Overloads Public Function CopyTo(String) As FileInfo
既存のファイルを上書きできるようにして、既存のファイルを新しいファイルにコピーします。
.NET Compact Framework でもサポート。
[Visual Basic] Overloads Public Function CopyTo(String, Boolean) As FileInfo
[JScript] public function CopyTo(String, Boolean) : FileInfo;
使用例
[Visual Basic, C#, C++] CopyTo メソッドの 2 種類の使用方法をオーバーロードした例を次に示します。
[Visual Basic, C#, C++] メモ ここでは、CopyTo のオーバーロード形式のうちの 1 つだけについて、使用例を示します。その他の例については、各オーバーロード形式のトピックを参照してください。
Imports System
Imports System.IO
Public Class Test
Public Shared Sub Main()
'Specify the directories you want to manipulate.
Dim path As String = "c:\temp\MyTest.txt"
Dim path2 As String = path + "temp"
Dim fi As FileInfo = New FileInfo(path)
Dim fi2 As FileInfo = New FileInfo(path2)
Try
Dim fs As FileStream = fi.Create()
fs.Close()
'Ensure that the target does not exist.
fi2.Delete()
'Copy the file.
fi.CopyTo(path2)
Console.WriteLine("{0} was copied to {1}.", path, path2)
'Try to copy it again, which should succeed.
fi.CopyTo(path2, True)
Console.WriteLine("The second Copy operation succeeded, which is expected.")
Catch
Console.WriteLine("Double copying was not allowed, which is not expected.")
End Try
End Sub
End Class
[C#]
using System;
using System.IO;
class Test
{
public static void Main()
{
string path = @"c:\temp\MyTest.txt";
string path2 = @"c:\temp\MyTest.txt" + "temp";
FileInfo fi1 = new FileInfo(path);
FileInfo fi2 = new FileInfo(path2);
try
{
// Create the file and clean up handles.
using (FileStream fs = fi1.Create()) {}
//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
{
Console.WriteLine("Double copying was not allowed, which is not expected.");
}
}
}
[C++]
#using <mscorlib.dll>
using namespace System;
using namespace System::IO;
int main() {
String* path = S"c:\\temp\\MyTest.txt";
String* path2 = S"c:\\temp\\MyTest.txttemp";
FileInfo* fi1 = new FileInfo(path);
FileInfo* fi2 = new FileInfo(path2);
try {
// Create the file and clean up handles.
FileStream* fs = fi1->Create();
if (fs) __try_cast<IDisposable*>(fs)->Dispose();
//Ensure that the target does not exist.
fi2->Delete();
//Copy the file.
fi1->CopyTo(path2);
Console::WriteLine(S"{0} was copied to {1}.", path, path2);
//Try to copy it again, which should succeed.
fi1->CopyTo(path2, true);
Console::WriteLine(S"The second Copy operation succeeded, which is expected.");
} catch (Exception*) {
Console::WriteLine(S"Double copying was not allowed, which is not expected.");
}
}
[Visual Basic, C#, C++] コピー先のファイルが既に存在する場合にファイルを上書きするかどうかを指定して、あるファイルを別のファイルにコピーする例を次に示します。
Imports System
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 'Main
End Class 'CopyToTest
[C#]
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() );
}
}
[C++]
#using <mscorlib.dll>
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 = new FileInfo(S"temp.txt");
// Create a writer, ready to add entries to the file.
StreamWriter* sw = fi->AppendText();
sw->WriteLine(S"Add as many lines as you like...");
sw->WriteLine(S"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(S"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(S"newTemp.txt", true);
// Get the information out of the new file and display it.* sr = new StreamReader( newfi->OpenRead() );
Console::WriteLine(S"{0}This is the information in the second file:", Environment::NewLine);
while (sr->Peek() != -1)
Console::WriteLine(sr->ReadLine());
}
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