FileInfo.AppendText Methode
Definition
Wichtig
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Erstellt einen StreamWriter, der der Datei Text hinzufügt, die von dieser Instanz von FileInfo dargestellt wird.
public:
System::IO::StreamWriter ^ AppendText();public System.IO.StreamWriter AppendText ();member this.AppendText : unit -> System.IO.StreamWriterPublic Function AppendText () As StreamWriterGibt zurück
Ein neuer StreamWriter.
Beispiele
Im folgenden Beispiel werden Text an eine Datei angefügt und aus der Datei gelesen.
using namespace System;
using namespace System::IO;
int main()
{
FileInfo^ fi = gcnew FileInfo( "c:\\MyTest.txt" );
// This text is added only once to the file.
if ( !fi->Exists )
{
//Create a file to write to.
StreamWriter^ sw = fi->CreateText();
try
{
sw->WriteLine( "Hello" );
sw->WriteLine( "And" );
sw->WriteLine( "Welcome" );
}
finally
{
if ( sw )
delete (IDisposable^)sw;
}
}
// This text will always be added, making the file longer over time
// if it is not deleted.
StreamWriter^ sw = fi->AppendText();
try
{
sw->WriteLine( "This" );
sw->WriteLine( "is Extra" );
sw->WriteLine( "Text" );
}
finally
{
if ( sw )
delete (IDisposable^)sw;
}
//Open the file to read from.
StreamReader^ sr = fi->OpenText();
try
{
String^ s = "";
while ( s = sr->ReadLine() )
{
Console::WriteLine( s );
}
}
finally
{
if ( sr )
delete (IDisposable^)sr;
}
}
//This code produces output similar to the following;
//results may vary based on the computer/file structure/etc.:
//
//Hello
//And
//Welcome
//This
//is Extra
//Text
//
//When you run this application a second time, you will see the following output:
//
//Hello
//And
//Welcome
//This
//is Extra
//Text
//This
//is Extra
//Text
using System;
using System.IO;
class Test
{
public static void Main()
{
FileInfo fi = new FileInfo(@"c:\MyTest.txt");
// This text is added only once to the file.
if (!fi.Exists)
{
//Create a file to write to.
using (StreamWriter sw = fi.CreateText())
{
sw.WriteLine("Hello");
sw.WriteLine("And");
sw.WriteLine("Welcome");
}
}
// This text will always be added, making the file longer over time
// if it is not deleted.
using (StreamWriter sw = fi.AppendText())
{
sw.WriteLine("This");
sw.WriteLine("is Extra");
sw.WriteLine("Text");
}
//Open the file to read from.
using (StreamReader sr = fi.OpenText())
{
string s = "";
while ((s = sr.ReadLine()) != null)
{
Console.WriteLine(s);
}
}
}
}
//This code produces output similar to the following;
//results may vary based on the computer/file structure/etc.:
//
//Hello
//And
//Welcome
//This
//is Extra
//Text
//When you run this application a second time, you will see the following output:
//
//Hello
//And
//Welcome
//This
//is Extra
//Text
//This
//is Extra
//Text
Imports System.IO
Public Class Test
Public Shared Sub Main()
Dim fi As FileInfo = New FileInfo("c:\temp\MyTest.txt")
Dim sw As StreamWriter
' This text is added only once to the file.
If fi.Exists = False Then
'Create a file to write to.
sw = fi.CreateText()
sw.WriteLine("Hello")
sw.WriteLine("And")
sw.WriteLine("Welcome")
sw.Flush()
sw.Close()
End If
' This text will always be added, making the file longer over time
' if it is not deleted.
sw = fi.AppendText()
sw.WriteLine("This")
sw.WriteLine("is Extra")
sw.WriteLine("Text")
sw.Flush()
sw.Close()
'Open the file to read from.
Dim sr As StreamReader = fi.OpenText()
Dim s As String
Do While sr.Peek() >= 0
s = sr.ReadLine()
Console.WriteLine(s)
Loop
sr.Close()
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
'This
'is Extra
'Text
'When you run this application a second time, you will see the following output:
'
'Hello
'And
'Welcome
'This
'is Extra
'Text
'This
'is Extra
'Text
Im folgenden Beispiel wird das Anfügen von Text am Ende einer Datei veranschaulicht und auch das Ergebnis des Anfügevorgangs an die Konsole angezeigt. Wenn diese Routine zum ersten Mal aufgerufen wird, wird die Datei erstellt, wenn sie nicht vorhanden ist. Danach wird der angegebene Text an die Datei angefügt.
using namespace System;
using namespace System::IO;
int main()
{
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.
// Remember that the file might have other lines if it already existed.
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.:
//Add as many lines as you like...
//Add another line to the output...
}
using System;
using System.IO;
public class AppendTextTest
{
public static void Main()
{
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.
// Remember that the file might have other lines if it already existed.
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...
Imports System.IO
Public Class AppendTextTest
Public Shared Sub Main()
Dim fi As New FileInfo("temp.txt")
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()
Dim sr As New StreamReader(fi.OpenRead())
' Get the information out of the file and display it.
' Remember that the file might have other lines if it already existed.
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.:
'Add as many lines as you like...
'Add another line to the output...