.net – 如何使用streamwriter和streamreader读取和写入文件

我试图从.csv文件中读取内容并将其存储在变量中.后来我将这些内容写入新文件.代码正在成功执行,但数据未出现在新文件中.有什么建议吗？

这是我的代码：

Dim ioFile As New System.IO.StreamReader("C:\sample.csv")

    Dim ioLine As String 
    Dim ioLines As String 
    ioLine = ioFile.ReadLine
    ioLines = ioLine
    While Not ioLine = ""
        ioLine = ioFile.ReadLine
        ioLines = ioLines & vbCrLf & ioLine

    End While
    Dim ioWriter As New System.IO.StreamWriter("C:\new.csv")
    ioWriter.WriteLine(ioLines)
    ioFile.Close()
    ioWriter.Close()

MSDN网站上有一些非常简短且非常好的教程：

> How to: Write text to a file
> How to: Read text from a file