抓取网页代码,Streambyte[]string转换

最新推荐文章于 2021-05-30 18:31:08 发布

原创最新推荐文章于 2021-05-30 18:31:08 发布 · 535 阅读

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CC 4.0 BY-SA版权

文章标签：

#string #exception #stream #byte #url #null

本文介绍使用C#在WinForm和WebForm中读取网页内容的方法，并展示了如何进行Stream、byte[]及string之间的相互转换。

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Read a Web Page in C#

一.WinForm窗体中的实现方法：
System.Net.WebClient class:
using System.Net;
using System.Windows.Forms;

string url = "http://www.devtopics.com";
string result = null;

try
{
    WebClient client = new WebClient();
    result = client.DownloadString( url );
}
catch (Exception ex)
{
    // handle error
    MessageBox.Show( ex.Message );
}

二.WebForm的实现方法：

using System.Net;
using System.IO;
using System.Windows.Forms;

string result = null;
string url = "http://www.devtopics.com";
WebResponse response = null;
StreamReader reader = null;

try
{
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create( url );
    request.Method = "GET";
    response = request.GetResponse();
    reader = new StreamReader( response.GetResponseStream(), Encoding.UTF8 );
    result = reader.ReadToEnd();
}
catch (Exception ex)
{
    // handle error
    MessageBox.Show( ex.Message );
}
finally
{
    if (reader != null)
        reader.Close();
    if (response != null)
        response.Close();
}

Stream<---->byte[]<----->string转换

//file------>stream------>xmlDocument
StreamReader streamReader = new StreamReader("D://time.txt");
XmlDocument xdoc = new XmlDocument();

            //stream----->bytes[]
            Stream stream = streamReader.BaseStream;
            byte[] bytes = new byte[stream.Length];
            stream.Read(bytes, 0, bytes.Length);

            //string------>bytes[]----->stream
            string test = "Test 1-2-3";
            byte[] byteArray = Encoding.ASCII.GetBytes(test);
            Stream streamTmp = new MemoryStream(byteArray);
            //MemoryStream mStream = new MemoryStream(byteArray);

            //stream------>string
            StreamReader sr = new StreamReader(mStream);
            string text = sr.ReadToEnd();