vb.net 教程 4-8 文本文件读写 4

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：

直接使用StreamReader（  '参数1：要打开的文件全路径，参数2：编码格式）
读取方式：循环读取指定数量的字符串，

    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, 0, 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：  

直接使用StreamWriter( 参数1：要写入的文件全路径，参数2：编码格式)
写入方式：循环写入指定数量的字符串

    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

以上提供了6种读写文本文件的方法，各位读者请根据实际情况使用最方便的方法。

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。

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