FileInfo.AppendText 方法
定義
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
建立將文字附加在 StreamWriter 的這個執行個體所表示之檔案的 FileInfo。
public:
System::IO::StreamWriter ^ AppendText();public System.IO.StreamWriter AppendText ();member this.AppendText : unit -> System.IO.StreamWriterPublic Function AppendText () As StreamWriter傳回
新的 StreamWriter。
範例
下列範例會將文字附加至檔案，並從檔案讀取。
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
下列範例示範將文字附加至檔案結尾，也會將附加作業的結果顯示至主控台。 第一次呼叫此例程時，如果檔案不存在，就會建立檔案。 之後，指定的文字會附加至檔案。
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...
