Vb.net如何仅读取html模板文件的特定部分

Dim htmlFile As String = "path/to/html/file.html"
Dim reader As New System.IO.StreamReader(htmlFile)

Dim startTag As String = "<!-- start of specific section -->"
Dim line As String = reader.ReadLine()

While line IsNot Nothing
    If line.Contains(startTag) Then
        Exit While
    End If
    line = reader.ReadLine()
End While

Dim endTag As String = "<!-- end of specific section -->"
Dim specificSection As New StringBuilder()

While line IsNot Nothing
    If line.Contains(endTag) Then
        Exit While
    End If
    specificSection.AppendLine(line)
    line = reader.ReadLine()
End While

reader.Close()
Dim specificSectionContent As String = specificSection.ToString()