How to read the Website content in c#?

问题

I want to read the website text without html tags and headers. i just need the text displayed in the web browser.

i don't need like this

<html>
<body>
bla bla </td><td>
bla bla 
<body>
<html>

i just need the text "bla bla bla bla".

I have used the webclient and httpwebrequest methods to get the HTML content and to split the received data but it is not possible because if i change the website the tags may change.

So is there any way to get only the displayed text in the website anagrammatically?

回答1:

Here is how you would do it using the HtmlAgilityPack.

First your sample HTML:

var html = "<html>\r\n<body>\r\nbla bla </td><td>\r\nbla bla \r\n<body>\r\n<html>";

Load it up (as a string in this case):

var doc = new HtmlAgilityPack.HtmlDocument();
doc.LoadHtml(html);

If getting it from the web, similar:

var web = new HtmlWeb();
var doc = web.Load(url);

Now select only text nodes with non-whitespace and trim them.

var text = doc.DocumentNode.Descendants()
              .Where(x => x.NodeType == HtmlNodeType.Text && x.InnerText.Trim().Length > 0)
              .Select(x => x.InnerText.Trim());

You can get this as a single joined string if you like:

String.Join(" ", text)

Of course this will only work for simple web pages. Anything complex will also return nodes with data you clearly don't want, such as javascript functions etc.

回答2:

You need to use special HTML parser. The only way to get the content of the such non regular language.

See: What is the best way to parse html in C#?

回答3:

public string GetwebContent(string urlForGet)
{
    // Create WebClient
    var client = new WebClient();
    // Download Text From web
    var text = client.DownloadString(urlForGet);
    return text.ToString();
}

回答4:

I think this link can help you.

/// <summary>
/// Remove HTML tags from string using char array.
/// </summary>
public static string StripTagsCharArray(string source)
{
char[] array = new char[source.Length];
int arrayIndex = 0;
bool inside = false;

for (int i = 0; i < source.Length; i++)
{
    char let = source[i];
    if (let == '<')
    {
    inside = true;
    continue;
    }
    if (let == '>')
    {
    inside = false;
    continue;
    }
    if (!inside)
    {
    array[arrayIndex] = let;
    arrayIndex++;
    }
}
return new string(array, 0, arrayIndex);
}

回答5:

// Reading Web page content in c# program
//Specify the Web page to read
WebRequest request = WebRequest.Create("http://aspspider.info/snallathambi/default.aspx");
//Get the response
WebResponse response = request.GetResponse(); 
//Read the stream from the response
StreamReader reader = new StreamReader(response.GetResponseStream()); 
//Read the text from stream reader
string str = reader.ReadLine();
for(int i=0;i<200;i++)
{
   str += reader.ReadLine();

}

Console.Write(str);

来源：https://stackoverflow.com/questions/10579292/how-to-read-the-website-content-in-c

标签

html

httpwebrequest

webclient

streamreader