我有一个让我头疼的问题。我真的以为有人会问这个问题，但几天的阅读和测试都没有结果。
我有一个文本文件，它开始：
"Determining profile based on KDBG search...
Suggested Profile(s) : WinXPSP2x86, WinXPSP3x86 (Instantiated with WinXPSP2x86)"
（两者之间的空行不是错误，"建议"之前的空格也不是错误）
我需要阅读以"建议..."开头的行仅提取以"Win"开头的每个唯一单词，并用它们填充组合框。（即"WinXPSP2x86"和"WinXPSP3x86"）
我知道我需要使用"StreamReader"类，并且可能会有一个正则表达式，但是，作为一个初学者，将它们连接在一起目前超出了我的知识范围。
谁能帮忙？将不胜感激。
Imports System.IO
Public Class Form1
Private Sub Form1_Load( sender As Object, e As EventArgs) Handles MyBase.Load
' BASIC is case sensitive and e is parameter so we will start
' new variables with the letter f.
' Read all lines of file into string array F.
Dim F As String() = File.ReadAllLines("H:Projects35021241Input.txt")
' F() is a 0 based array. Assign 3 line of file to G.
Dim G As String = F(2)
' On line 3 of file find starting position of the word 'win' and assign to H.
' TODO: If it is not found H will be -1 and we should quit.
Dim H As Integer = G.IndexOf("Win")
' Assign everything beginning at 'win' on line 3 to variable I.
Dim I As String = G.Substring(H)
' The value placed in delimiter will separate remaining values in I.
' Place C after ending quote to represent a single character as opposed to a string.
Dim Delimiter As Char = ","C
' J array will contain values left in line 3.
Dim J As String() = I.Split(Delimiter)
' Loop through J array removing anything in parenthesis.
For L = J.GetLowerBound(0) to J.GetUpperBound(0)
' Get location of open parenthesis.
Dim ParenBegin As Integer = J(L).IndexOf("(")
' If no open parenthesis found continue.
If ParenBegin <> -1 then
' Open parenthesis found. Find closing parenthesis location
' starting relative to first parenthesis.
Dim Temp As String = J(L).Substring(ParenBegin+1)
' Get location of ending parenthesis.
Dim ParenEnd As Integer = Temp.IndexOf(")")
' TODO: Likely an exception will be thrown if no ending parenthesis.
J(L) = J(L).Substring(0,ParenBegin) & J(L).Substring(ParenBegin + ParenEnd +2)
' Change to include text up to open parenthesis and after closing parenthesis.
End If
Next L
' UnwantedChars contains a list of characters that will be removed.
Dim UnwantedChars As String = ",()"""
' Check each value in J() for presence of each unwanted character.
For K As Integer = 0 to (UnwantedChars.Length-1)
For L = J.GetLowerBound(0) To J.GetUpperBound(0)
' Declare M here so scope will be valid at loop statement.
Dim M As Integer = 0
Do
' Assign M the location of the unwanted character or -1 if not found.
M= J(L).IndexOf(UnwantedChars.Substring(K,1))
' Was this unwanted character found in this value?
If M<>-1 Then
' Yes - where was it found in the value?
Select Case M
Case 0 ' Beginning of value
J(L) = J(L).Substring(1)
Case J(L).Length ' End of value.
J(L) = J(L).Substring(0,(M-1))
Case Else ' Somewhere in-between.
J(L) = J(L).Substring(0,M) & J(L).Substring(M+1)
End Select
Else
' No the unwanted character was not found in this value.
End If
Loop Until M=-1 ' Go see if there are more of this unwanted character in the value.
Next L ' Next value.
Next K ' Next unwanted character.
' Loop through all the values and trip spaces from beginning and end of each.
For L As Integer = J.GetLowerBound(0) To J.GetUpperBound(0)
J(L) = J(L).Trim
Next L
' Assign the J array to the combobox.
ComboBox1.DataSource = J
End Sub
End Class
正如一些人已经建议的那样：
- 使用System.IO.File.ReadAllLines，如果文件不是太大
- 遍历行数组
- 对于每一行，使用 Split 方法在空格上拆分
- 检查每个单词的前三个字符
这有效，但当然需要一些错误检查等：
Dim lines（） As String = System.IO.File.ReadAllLines（"c：\temp\example.txt"） 将行单词（） 暗淡为字符串 对于每一行作为字符串在行中 行字 = 行。Split（New Char（） {" "}， System.StringSplitOptions.RemoveEmptyEntries） 对于每个单词作为字符串在行单词 如果字。长度> 3 然后 如果字。子字符串（0， 3）.ToUpper = "WIN" 那么 cmbWords.Items.Add（word） 结束如果 结束如果 下一个 下一个