Question

我正试图用c#(模拟 php功能——文档_get_contents)使用以下代码装载html的内容:

protected string file_get_contents(string fileName) 
{ 
  string sContents = string.Empty; 
  if (fileName.ToLower().IndexOf("http:") > -1) 
  { // URL 
   System.Net.WebClient wc = new System.Net.WebClient(); 
   byte[] response = wc.DownloadData(fileName); 
   sContents = System.Text.Encoding.ASCII.GetString(response); 
  } else { 
   // Regular Filename 
   System.IO.StreamReader sr = new System.IO.StreamReader(fileName); 
   sContents = sr.ReadToEnd(); 
   sr.Close(); 
  } 
 return sContents;
}

However, this does not load the image in the html when rendering the content. But when use PHP file_get_content, it does load the image in the html when rendering the content.

没有人会有什么想法?

Answer 1

Looking at the documentation for file_get_contents, there shouldn t be a difference between using a WebClient and this function to download the contents of an HTML page. In both cases, you ll get a string like this:

string html = @"<!DOCTYPE html>
<html>
<head>
   <title>Hello World</title>
</head>
<body>
   Image: <img src=""/image/test.png"">
</body>
</html>";

Of course, /image/test.png is relative to the URL you downloaded the HTML page from. So if you download the HTML page from http://www.example.com/test.html and render the retrieved data at http://www.yourdomain.net/foo/bar/qux.html the image tag will refer to http://www.yourdomain.net/image/test.png rather than http://www.example.com/image/test.png.

You need to rewrite relative URLs to absolute ones before rendering the HTML page. Have a look at the Html Agility Pack for this task.

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