Three ways to get web page content in C#

Search the web and find that C# usually has three ways to get web page content, using WebClient, WebBrowser or HttpWebRequest/HttpWebResponse. . .

Method 1: Use WebClient (quoted from: http://fbljava.blog.163.com/blog/static/265211742008712105145244/ )

static void Main(string[] args)

{

    try {

        WebClient MyWebClient = new WebClient();


        MyWebClient.Credentials = CredentialCache.DefaultCredentials;//Gets or sets the network credentials used to authenticate requests to Internet resources

        Byte[] pageData = MyWebClient.DownloadData(" http://www.163.com"); //Download data from the specified website

        string pageHtml = Encoding.Default.GetString(pageData); //If GB2312 is used to get the website page, use this sentence

        //string pageHtml = Encoding.UTF8.GetString(pageData); //If the website page is obtained in UTF-8, use this sentence

        Console.WriteLine(pageHtml);//Enter the acquired content in the console

        using (StreamWriter sw = new StreamWriter("c:\\test\\ouput.html"))//Write the acquired content to text

        {

            sw.Write(pageHtml);

        }

        Console.ReadLine(); //Let the console pause, otherwise it will flash over

    }

    catch(WebException webEx) {

        Console.WriteLine(webEx.Message.ToString());

    }

}

Method 2: Use WebBrowser (quoted from: http://topic.csdn.net/u/20091225/14/4ea221cd-4c1e-4931-a6db-1fd4ee7398ef.html )

WebBrowser web = new WebBrowser();
web.Navigate("http://www.xjflcp.com/ssc/");
web.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(web_DocumentCompleted);
void web_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
            WebBrowser web = (WebBrowser)sender;
            HtmlElementCollection ElementCollection = web.Document.GetElementsByTagName("Table");
            foreach (HtmlElement item in ElementCollection)
            {
                 File.AppendAllText("Kaijiang_xj.txt", item.InnerText);
            }
        }

方法三：使用HttpWebRequest/HttpWebResponse （引用自：http://hi.baidu.com/onlyafar/blog/item/7ac4c6bf92d4810019d81f98.html）

HttpWebRequest httpReq;
HttpWebResponse httpResp;

string strBuff = "";
char[] cbuffer = new char[256];
int byteRead = 0;

string filename = @"c:\log.txt";
///定义写入流操作
public void WriteStream()
{
Uri httpURL = new Uri(txtURL.Text);

///HttpWebRequest类继承于WebRequest，并没有自己的构造函数，需通过WebRequest的Creat方法建立，并进行强制的类型转换
      httpReq = (HttpWebRequest)WebRequest.Create(httpURL);
///通过HttpWebRequest的GetResponse()方法建立HttpWebResponse,强制类型转换

   httpResp = (HttpWebResponse) httpReq.GetResponse();
///GetResponseStream()方法获取HTTP响应的数据流,并尝试取得URL中所指定的网页内容

     ///若成功取得网页的内容，则以System.IO.Stream形式返回，若失败则产生ProtoclViolationException错误。在此正确的做法应将以下的代码放到一个try块中处理。这里简单处理
Stream respStream = httpResp.GetResponseStream();

///返回的内容是Stream形式的，所以可以利用StreamReader类获取GetResponseStream的内容，并以

StreamReader类的Read方法依次读取网页源程序代码每一行的内容，直至行尾（读取的编码格式：UTF8）
StreamReader respStreamReader = new StreamReader(respStream,Encoding.UTF8);

byteRead = respStreamReader.Read(cbuffer,0,256);

while (byteRead != 0)
{
string strResp = new string(cbuffer,0,byteRead);
                  strBuff = strBuff + strResp;
                  byteRead = respStreamReader.Read(cbuffer,0,256);
}

respStream.Close();
txtHTML.Text = strBuff;
}

Three ways to get web page content in C#

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