将大字符串缩小为特定段落 [英] Scaling down a large string to a specific paragraph

问题描述

大家好，

我正在制作一个''windows forms''项目，要求我从网站上获取一些文字并在程序中显示。



下面有我的公共子，它基本上读取了相关网站的源代码，将其转换为字节中的字符串，并将其显示在多行文本框中表单。

Hi everyone,
I''m currently working on a ''windows forms'' project that requires me to get some text from a website and display it within the program.

I have my public sub below, which basically reads the source code of the site in question, converts it to a string from a byte, and displays it in a multi-line textbox on the form.

Public Sub LoadSiteContent(ByVal url As String)
  Dim client As New WebClient
  Dim html As Byte() = client.DownloadData(url)
  Dim webString As String = System.Text.Encoding.UTF8.GetString(html)
  TextBox1.Text = webString
End Sub

此子获取全部源代码，而我只想在网站上有一个特定的段落，那么有没有办法缩小我在页面源中转换为该段落的字符串？也许通过使用正则表达式或子串？



我的班级也有这个导入：

This sub gets all the source code, whereas I only want a specific paragraph on the site, so is there a way to scale down the string I converted to just that paragraph within the page source? Maybe through using regular expressions or substrings?

I also have this import at the top of my class:

Imports System.Net

非常感谢任何回复，谢谢。

Any response is greatly appreciated, thanks.

推荐答案

这可能是你认为你想要的更多，但是......

这个过程被称为网络抓取，有一篇很好的文章关于它在这里：使用正则表达式在ASP.NET中进行Web Scraping匹配和XML转换 [ ^ ] - 它在C＃中，但代码很容易翻译，描述非常清晰。

This is probably a bit more that you think you wanted, but...
The process is called "Web scraping", and there is a nice article about it here: Web Scraping in ASP.NET with Regular Expression Matching and XML Transformation[^] - it''s in C#, but the code is easily translatable, and the description is very clear.

如果有网页上该段之前和之后的固定文本（例如id =''xyz''的标签你可以在返回的字符串中找到它，然后从中获取所需的段落。我已经在我的一个应用程序中完成了这个，希望它对你也有帮助。如果有帮助，请标记为答案。

If there is a fixed text before and after that paragraph on the webpage (ex- some tag with id=''xyz'') you can find it in the string returned and then get the required paragraph from that. I have done this in one of my application hope it will be helpful for u also. please mark as answer if helped.

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