vb.net StreamReader 找不到文件结尾
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StreamReader not finding end of file
提问by John
I simply need to read lines from a text file and show them. When I run this I can see that id does what I want, but after it reads the last value it just shows a blank form on my screen and does not move on. It seems like it can't find the end of the file or something. I don't get an error.
我只需要从文本文件中读取行并显示它们。当我运行它时，我可以看到 id 做了我想要的，但是在它读取最后一个值后，它只在我的屏幕上显示一个空白表单并且不会继续。它似乎无法找到文件的末尾或其他东西。我没有收到错误。
Using sr As New System.IO.StreamReader(Application.StartupPath & "\myfile.cfg")
Dim Line As String = ""
Dim i As Integer = 0
Dim temp_array As Array
Do While Line IsNot Nothing
Line = sr.ReadLine
temp_array = Line.Split("=")
'MessageBox.Show(temp_array(0))
Loop
End Using
回答by jmcilhinney
That is bad code because you're actually going to use Linebefore testing whether it's Nothing. Here are two good options for looping through the lines of a text file:
那是糟糕的代码，因为Line在测试它是否为Nothing. 以下是循环文本文件各行的两个不错的选择：
Using reader As New StreamReader(filePath)
Dim line As String
Do Until reader.EndOfStream
line = reader.ReadLine()
'...
Loop
End Using
For Each line In File.ReadLines(filePath)
'...
Next
As you can see, the second is far more concise but it does require .NET 4.0 or later.
如您所见，第二个要简洁得多，但它确实需要 .NET 4.0 或更高版本。
