如何：向文件写入文本
更新：2007 年 11 月
下面的代码示例演示如何向文本文件中写入文本。
第一个示例演示如何向现有文件中添加文本。第二个示例演示如何创建一个新文本文件并向其中写入一个字符串。WriteAllText 方法可提供类似的功能。
.gif "说明") 说明： |
|---|
Visual Basic 用户可以选择使用由 My.Computer.FileSystem 对象提供的方法和属性进行文件 I/O。有关更多信息，请参见 My.Computer.FileSystem 对象。 |
示例
Imports System
Imports System.IO
Class Test
Public Shared Sub Main()
' Create an instance of StreamWriter to write text to a file.
Using sw As StreamWriter = New StreamWriter("TestFile.txt")
' Add some text to the file.
sw.Write("This is the ")
sw.WriteLine("header for the file.")
sw.WriteLine("-------------------")
' Arbitrary objects can also be written to the file.
sw.Write("The date is: ")
sw.WriteLine(DateTime.Now)
sw.Close()
End Using
End Sub
End Class
using System;
using System.IO;
class Test
{
public static void Main()
{
// Create an instance of StreamWriter to write text to a file.
// The using statement also closes the StreamWriter.
using (StreamWriter sw = new StreamWriter("TestFile.txt"))
{
// Add some text to the file.
sw.Write("This is the ");
sw.WriteLine("header for the file.");
sw.WriteLine("-------------------");
// Arbitrary objects can also be written to the file.
sw.Write("The date is: ");
sw.WriteLine(DateTime.Now);
}
}
}
Option Explicit On
Option Strict On
Imports System
Imports System.IO
Public Class TextToFile
Private Const FILE_NAME As String = "MyFile.txt"
Public Shared Sub Main()
If File.Exists(FILE_NAME) Then
Console.WriteLine("{0} already exists.", FILE_NAME)
Return
End If
Using sw As StreamWriter = File.CreateText(FILE_NAME)
sw.WriteLine("This is my file.")
sw.WriteLine("I can write ints {0} or floats {1}, and so on.", 1, 4.2)
sw.Close()
End Using
End Sub
End Class
using System;
using System.IO;
public class TextToFile
{
private const string FILE_NAME = "MyFile.txt";
public static void Main(String[] args)
{
if (File.Exists(FILE_NAME))
{
Console.WriteLine("{0} already exists.", FILE_NAME);
return;
}
using (StreamWriter sw = File.CreateText(FILE_NAME))
{
sw.WriteLine ("This is my file.");
sw.WriteLine ("I can write ints {0} or floats {1}, and so on.",
1, 4.2);
sw.Close();
}
}
}