读取文本文件中的某一行并显示下一行 [英] Read certain line in text file and display the next

问题描述

我是 VB.net 的新手，我需要帮助.我想要做的是在文本文件中找到某一行并在文本框中显示下一行.对于第一部分(找到线)，我做得很好，但我正在努力处理第二部分，该部分显示的是我找到的线之后的线！

I am new to VB.net and I need help. What I am trying to do is to find a certain line in a text file and display the next line in a textbox. With the first part (finding the line) I'm doing just fine but I am struggling with the second part which is displaying the line that is after the one I have found!

这是我正在使用的测试文件的内容:

Here is the content of the test file that I am using:

哈哈

这就是我到目前为止所做的:

And this is what I have done so far:

    Using sReader As New StreamReader("filepath")

        While Not sReader.EndOfStream
            Dim line As String = sReader.ReadLine()
            If line.Contains("123") Then
                TextBox1.Text = line
            End If
        End While

    End Using

收到的结果:

推荐答案

While Not sReader.EndOfStream
    Dim line As String = sReader.ReadLine()
    If line.Contains("123") AndAlso Not sReader.EndOfStream Then
        Dim nextLine As String = sReader.ReadLine()
        TextBox1.Text = nextLine
        Exit While
    End If
End While

使用 LINQ 可以使完整代码更具可读性:

With LINQ the complete code can be made much more readable:

Dim nextLineAfterMatch = File.ReadLines("filepath").
    SkipWhile(Function(line) Not line.Contains("123")).
    Skip(1).
    FirstOrDefault()

If nextLineAfterMatch IsNot Nothing Then TextBox1.Text = nextLineAfterMatch 

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