C#获取网页内容

搜索网络,发现C#通常有三种方法获取网页内容,使用WebClient、WebBrowser或者HttpWebRequest/HttpWebResponse。。。

方法一:使用WebClient (引用自:http://fbljava.blog.163.com/blog/static/265211742008712105145244/

static void Main(string[] args)

{

    try {

        WebClient MyWebClient = new WebClient();

       
        MyWebClient.Credentials = CredentialCache.DefaultCredentials;//获取或设置用于向Internet资源的请求进行身份验证的网络凭据

        Byte[] pageData = MyWebClient.DownloadData(“http://www.163.com”); //从指定网站下载数据

        string pageHtml = Encoding.Default.GetString(pageData);  //如果获取网站页面采用的是GB2312,则使用这句            

        //string pageHtml = Encoding.UTF8.GetString(pageData); //如果获取网站页面采用的是UTF-8,则使用这句

        Console.WriteLine(pageHtml);//在控制台输入获取的内容

        using (StreamWriter sw = new StreamWriter(“c:\\test\\ouput.html”))//将获取的内容写入文本

        {

            sw.Write(pageHtml);

        }

        Console.ReadLine(); //让控制台暂停,否则一闪而过了             

    }

    catch(WebException webEx) {

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

    }

}

方法二:使用WebBrowser (引用自: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;
}

参考原文:https://www.cnblogs.com/ceachy/articles/CSharp_Retrive_Page_Document.html

C# PING获得延迟

using System;
using System.Net.NetworkInformation;
using System.Windows.Forms;

        /// <summary>
        /// 返回ping服务器的毫秒数
        /// </summary>
        /// <param name="Server">服务器域名或IP</param>
        /// <returns>延迟毫秒数(-1代表超时)</returns>
        private int GetServerPing(string strServer) {
            var ping = new Ping();
            PingReply pr;
            try
            {
                pr = ping.Send(strServer);
                if (pr.Status == IPStatus.Success)
                {
                    return (int)pr.RoundtripTime;
                }
                else
                {
                    return -1;
                }
            }
            catch (Exception)
            {

                return -1;
            }
        }

        private void frmMain_Load(object sender, EventArgs e)
        {
            //使用函数获取baidu.com的ping延迟(毫秒)
            MessageBox.Show("ping是:" + GetServerPing("baidu.com").ToString());
        }

参考Ping 类 (System.Net.NetworkInformation) | Microsoft Learn

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