假设格式是一致的（即文件中的每个记录事件总共使用 6 行文本），那么如果您要从文件中删除重复项，您只需要执行以下操作：
Sub DupClean(ByVal fpath As String) 'fpath is the FULL file path, i.e. C:\Users\username\Documents\filename.txt
Dim OrigText As String = ""
Dim CleanText As String = ""
Dim CText As String = ""
Dim SReader As New System.IO.StreamReader(fpath, System.Text.Encoding.UTF8)
Dim TxtLines As New List(Of String)
Dim i As Long = 0
Dim writer As New System.IO.StreamWriter(Left(fpath, fpath.Length - 4) & "_clean.txt", False) 'to overwrite the text inside the same file simply use StreamWriter(fpath)
Try
'Read in the text
OrigText = SReader.ReadToEnd
'Parse the text at new lines to allow selecting groups of 6 lines
TxtLines.AddRange(Split(OrigText, Chr(10))) 'may need to change the Chr # to look for depending on if 10 or 13 is used when the file is generated
Catch ex As Exception
MsgBox("Encountered an error while reading in the text file contents and parsing them. Details: " & ex.Message, vbOKOnly, "Read Error")
End
End Try
Try
'Now we iterate through blocks of 6 lines
Do While i < TxtLines.Count
'Set CText to the next 6 lines of text
CText = TxtLines.Item(i) & Chr(10) & TxtLines.Item(i + 1) & Chr(10) & TxtLines.Item(i + 2) & Chr(10) & TxtLines.Item(i + 3) & Chr(10) & TxtLines.Item(i + 4) & Chr(10) & TxtLines.Item(i + 5)
'Check if CText is already present in CleanText
If Not (CleanText.Contains(CText)) Then
'Add CText to CleanText
If CleanText.Length = 0 Then
CleanText = CText
Else
CleanText = CleanText & Chr(10) & CText
End If
End If 'else the text is already present and we don't need to do anything
i = i + 6
Loop
Catch ex As Exception
MsgBox("Encountered an error while running cleaning duplicates from the read in text. The application was on the " & i & "-th line of text when the following error was thrown: " & ex.Message, _
vbOKOnly, "Comparison Error")
End
End Try
Try
'Write out the clean text
writer.Write(CleanText)
Catch ex As Exception
MsgBox("Encountered an error writing the cleaned text. Details: " & ex.Message & Chr(10) & Chr(10) & "The cleaned text was " & CleanText, vbOKOnly, "Write Error")
End Try
End Sub
如果格式不一致，您将需要更高级并定义规则来告诉在任何给定的循环中添加哪些行到 CText，但是如果没有上下文，我将无法给您任何关于什么的想法那些可能是。