FileInfo(String) Oluşturucu
Önemli
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Bir dosya yolu için sarmalayıcı işlevi gören sınıfının yeni bir örneğini FileInfo başlatır.
public:
FileInfo(System::String ^ fileName);
public FileInfo (string fileName);
new System.IO.FileInfo : string -> System.IO.FileInfo
Public Sub New (fileName As String)
- fileName
- String
Yeni dosyanın tam adı veya göreli dosya adı. Yolu dizin ayırıcı karakteriyle sonlandırmayın.
fileName
, null
değeridir.
Çağıranın gerekli izni yok.
2.1'den eski .NET Framework ve .NET Core sürümleri: Dosya adı boş, yalnızca boşluk içeriyor veya geçersiz karakterler içeriyor.
fileName
erişimi reddedildi.
Belirtilen yol, dosya adı veya her ikisi birden sistem tarafından tanımlanan en fazla uzunluğu aşıyor.
fileName
dizenin ortasında iki nokta üst üste (:) içerir.
Aşağıdaki örnek, bu oluşturucuyu kullanarak iki dosya oluşturur ve bu dosyalara yazılır, buradan okunur, kopyalanır ve silinir.
using namespace System;
using namespace System::IO;
int main()
{
String^ path = "c:\\MyTest.txt";
FileInfo^ fi1 = gcnew FileInfo( path );
if ( !fi1->Exists )
{
//Create a file to write to.
StreamWriter^ sw = fi1->CreateText();
try
{
sw->WriteLine( "Hello" );
sw->WriteLine( "And" );
sw->WriteLine( "Welcome" );
}
finally
{
if ( sw )
delete (IDisposable^)sw;
}
}
//Open the file to read from.
StreamReader^ sr = fi1->OpenText();
try
{
String^ s = "";
while ( s = sr->ReadLine() )
{
Console::WriteLine( s );
}
}
finally
{
if ( sr )
delete (IDisposable^)sr;
}
try
{
String^ path2 = String::Concat( path, "temp" );
FileInfo^ fi2 = gcnew FileInfo( path2 );
//Ensure that the target does not exist.
fi2->Delete();
//Copy the file.
fi1->CopyTo( path2 );
Console::WriteLine( "{0} was copied to {1}.", path, path2 );
//Delete the newly created file.
fi2->Delete();
Console::WriteLine( "{0} was successfully deleted.", path2 );
}
catch ( Exception^ e )
{
Console::WriteLine( "The process failed: {0}", e );
}
}
//This code produces output similar to the following;
//results may vary based on the computer/file structure/etc.:
//
//Hello
//And
//Welcome
//c:\MyTest.txt was copied to c:\MyTest.txttemp.
//c:\MyTest.txttemp was successfully deleted.
using System;
using System.IO;
class Test
{
public static void Main()
{
string path = @"c:\temp\MyTest.txt";
FileInfo fi1 = new FileInfo(path);
if (!fi1.Exists)
{
//Create a file to write to.
using (StreamWriter sw = fi1.CreateText())
{
sw.WriteLine("Hello");
sw.WriteLine("And");
sw.WriteLine("Welcome");
}
}
//Open the file to read from.
using (StreamReader sr = fi1.OpenText())
{
string s = "";
while ((s = sr.ReadLine()) != null)
{
Console.WriteLine(s);
}
}
try
{
string path2 = path + "temp";
FileInfo fi2 = new FileInfo(path2);
//Ensure that the target does not exist.
fi2.Delete();
//Copy the file.
fi1.CopyTo(path2);
Console.WriteLine("{0} was copied to {1}.", path, path2);
//Delete the newly created file.
fi2.Delete();
Console.WriteLine("{0} was successfully deleted.", path2);
}
catch (Exception e)
{
Console.WriteLine("The process failed: {0}", e.ToString());
}
}
}
//This code produces output similar to the following;
//results may vary based on the computer/file structure/etc.:
//
//Hello
//And
//Welcome
//c:\MyTest.txt was copied to c:\MyTest.txttemp.
//c:\MyTest.txttemp was successfully deleted.
Imports System.IO
Class Test
Public Shared Sub Main()
Dim path As String = "c:\temp\MyTest.txt"
Dim fi1 As FileInfo = New FileInfo(path)
If fi1.Exists = False Then
'Create a file to write to.
Dim sw As StreamWriter = fi1.CreateText()
sw.WriteLine("Hello")
sw.WriteLine("And")
sw.WriteLine("Welcome")
sw.Flush()
sw.Close()
End If
'Open the file to read from.
Dim sr As StreamReader = fi1.OpenText()
Do While sr.Peek() >= 0
Console.WriteLine(sr.ReadLine())
Loop
Try
Dim path2 As String = path + "temp"
Dim fi2 As FileInfo = New FileInfo(path2)
'Ensure that the target does not exist.
fi2.Delete()
'Copy the file.
fi1.CopyTo(path2)
Console.WriteLine("{0} was copied to {1}.", path, path2)
'Delete the newly created file.
fi2.Delete()
Console.WriteLine("{0} was successfully deleted.", path2)
Catch e As Exception
Console.WriteLine("The process failed: {0}", e.ToString())
End Try
End Sub
End Class
'This code produces output similar to the following;
'results may vary based on the computer/file structure/etc.:
'
'Hello
'And
'Welcome
'c:\MyTest.txt was copied to c:\MyTest.txttemp.
'c:\MyTest.txttemp was successfully deleted.
Aşağıdaki örnek var olan bir dosyayı açar veya bir dosya oluşturur, dosyaya metin ekler ve sonuçları görüntüler.
using namespace System;
using namespace System::IO;
int main()
{
// Open an existing file, or create a new one.
FileInfo^ fi = gcnew FileInfo( "temp.txt" );
// Create a writer, ready to add entries to the file.
StreamWriter^ sw = fi->AppendText();
sw->WriteLine( "This is a new entry to add to the file" );
sw->WriteLine( "This is yet another line to add..." );
sw->Flush();
sw->Close();
// Get the information out of the file and display it.
StreamReader^ sr = gcnew StreamReader( fi->OpenRead() );
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 a new entry to add to the file
//This is yet another line to add...
using System;
using System.IO;
public class FileInfoMainTest
{
public static void Main()
{
// Open an existing file, or create a new one.
FileInfo fi = new FileInfo("temp.txt");
// Create a writer, ready to add entries to the file.
StreamWriter sw = fi.AppendText();
sw.WriteLine("This is a new entry to add to the file");
sw.WriteLine("This is yet another line to add...");
sw.Flush();
sw.Close();
// Get the information out of the file and display it.
StreamReader sr = new StreamReader( fi.OpenRead() );
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.:
//
//Add as many lines as you like...
//Add another line to the output...
//This is a new entry to add to the file
//This is yet another line to add...
Imports System.IO
Public Class FileInfoMainTest
Public Shared Sub Main()
' Open an existing file, or create a new one.
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("This is a new entry to add to the file")
sw.WriteLine("This is yet another line to add...")
sw.Flush()
sw.Close()
Dim sr As New StreamReader(fi.OpenRead())
' Get the information out of the file and display it.
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 a new entry to add to the file
'This is yet another line to add...
Tam veya göreli dosya adını belirtebilirsiniz, ancak güvenlik denetimi tam adı alır.
Ürün | Sürümler |
---|---|
.NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
.NET Standard | 1.3, 1.4, 1.6, 2.0, 2.1 |
UWP | 10.0 |
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