继续上一节，继续读写代码的编写。
为了简化操作，所有的Encoding均采用Encoding.Default。
读取方式5：
Private Sub readText5(ByVal filename As String)
Dim textContent As String
Dim buffer() As Char
Dim lenRead As Integer = 200
Dim readLength As Integer
Dim sr As New StreamReader(filename,Encoding.Default)
Do
ReDim buffer(lenRead - 1)
readLength = sr.Read(buffer,lenRead)
If readLength <= 0 Then Exit Do
textContent = New String(buffer)
txtFile.Text &= textContent
Loop While True
sr.Close()
End Sub
写入方法5：
Private Sub writeText5(ByVal filename As String)
Dim textContent As String = txtFile.Text
Dim buffer() As Char = textContent.tocharArray
Dim lenTotal As Long = buffer.Length
Dim lenWrite As Integer = 30
Dim buffPos As Integer = 0
'Dim fs As New FileStream(filename,FileMode.OpenOrCreate)
'Dim sw As New StreamWriter(fs)
Dim sw As New StreamWriter(filename， False)
Do While buffPos < lenTotal
If buffPos + lenWrite > lenTotal Then
lenWrite = lenTotal - buffPos
End If
sw.Write(buffer,buffPos,lenWrite)
buffPos += lenWrite
Loop
sw.Close()
End Sub
读取方式6：
直接使用File的方法ReadAllText()
Private Sub readText6(ByVal filename As String)
Dim textContent As String
textContent = File.ReadAllText(filename,Encoding.Default)
txtFile.Text = textContent
End Sub
写入方式6：
直接使用File的方法WriteAllText()
Private Sub writeText6(ByVal filename As String)
Dim textContent As String = txtFile.Text
File.WriteAllText(filename,textContent,Encoding.Default)
End Sub
由于.net平台下C#和vb.NET很相似，本文也可以为C#爱好者提供参考。
学习更多vb.net知识，请参看 vb.net 教程 目录