在.Net中获取HTML元素的内部文本并避免额外的空格
通过.Net的MSHTML库，可以快速操作HTML文档树。但是，使用IHTMLElement.innerText获取元素的渲染后文本时，可能存在多余的段首空格。此时，可以使用IHTMLElement.innerHTML属性，先获取HTML格式的文本，再进行后续的解析。
下面的示例代码需要参考COM组件Microsoft HTML Object Library和程序集System.Web：
Imports mshtml
Imports System.Text
Imports System.IO
Imports System.Net
Imports System.Web
Private Function GetInnerTextFromTextContainer() As String
'Create HTML document object and elements collection
Dim CurrentHTMLDocument As HTMLDocument = Nothing
Dim PossibleElements As IHTMLElementCollection = Nothing
Dim CurrentElement As IHTMLElement = Nothing
'Get HTML document from WebBrowser control
CurrentHTMLDocument = wbbWebContainer.Document
'Find div elements with class "text-container"
PossibleElements = CurrentHTMLDocument.getElementsByTagName("div")
For Each CurrentElement In PossibleElements
If CurrentElement.className = "text-container" Then
'Using CurrentElement.innerText may cause problems (unneeded leading white spaces)
Dim PageSourceHTML As String = CurrentElement.innerHTML.Replace("<br>", "").Trim()
Dim PageSourceText As String = HttpUtility.HtmlDecode(PageSourceHTML)
PageSourceText = PageSourceText.Replace(vbCrLf, vbLf)
PageSourceText = PageSourceText.Replace(vbCr, vbLf)
PageSourceText = PageSourceText.Replace(vbLf, Environment.NewLine)
PageSourceText = PageSourceText.Replace(ChrW(&HA0), " ")
Return PageSourceText
End If
Next
Return ""
End Function参考资料：
https://learn.microsoft.com/zh-tw/dotnet/api/system.web.httputility.htmldecode?view=net-8.0
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