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Visual Basic.NET文本操作

2009-05-25 12:40 316 查看

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<VB.net>Visual Basic.NET文本操作
2007-07-05 11:47

将文本文件导入数组

开始时引用
Imports System.IO

按钮的Click事件
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
'打开目标文件(文件流)
Dim myFs As New FileStream(Application.StartupPath & "/a.txt", FileMode.Open, FileAccess.Read)
'读文件
Dim r As New StreamReader(myFs)
Dim i As Integer
Dim myLine, tempStr As String
'创建数组，接收文件数据
Dim myLineStr(), a(100), b(100) As String
Dim c(100) As Integer
i = 0
myLine = r.ReadLine
Do While Not (myLine Is Nothing)
myLineStr = myLine.Split(",")
a(i) = myLineStr(0)
b(i) = myLineStr(1)
c(i) = myLineStr(2)
i += 1
Loop
End Sub

在VB.NET里操作文本文件

在.NET里的System.IO.File和System.IO.FileInfo里的OpenText和AppenText等几个方法都是使用UTF-8编码操作文件的.这就导致如果操作不是使用UTF-8编码编写的文件时将会出现乱码现象!!!
解决方法就是对文本文件使用字节流操作,即不使用.NET里提供的OpenText和AppenText等几个方法,而是将文本当成二进制文件来操作,并且在操作时使用Encoding的方法进行相应的解码即可.实现代码如下:
打开文本文件:
Public Function LoadFile(ByVal FileName As String) as String
If FileName= "" Then
Return ""
End If
Try
Dim FileReader As FileStream = File.Open(FileName, FileMode.Open)
Dim FileByte(FileReader.Length) As Byte
FileReader.Read(FileByte, 0, FileReader.Length)
'转成系统对应的编码字符
Dim MyEncoder As Encoding = Encoding.Default
FileReader.Close()
FileReader = Nothing
Return New String(MyEncoder.GetChars(FileByte))
Catch e As Exception
Return ""
End Try
End Sub

保存文件:
Public Sub SaveToFile(ByRef Conten As String, ByVal FileName As String)
'/*将Conten字符串的内容写入FileName文件
If FileName = "" Then
Exit Sub
End If
Try
Dim FileToWrite As FileStream = File.Create(FileName)
Dim rByte() As Byte = Encoding.Default.GetBytes(Conten.ToCharArray)
FileToWrite.Write(rByte, 0, rByte.Length)
FileToWrite.Close()
FileToWrite = Nothing
Catch e As Exception
End Try
End Sub

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