Csharp/CSharp Tutorial/Network/WebRequest

Материал из .Net Framework эксперт
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Download image from a website

using System;
using System.Net;
using System.IO;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
public class MainClass {
   [STAThread]
   public static void Main(string[] args)
   {
       string picUri = "http://www.java.ru/style/logo.PNG";
       
       // Create the requests.
       WebRequest requestPic = WebRequest.Create(picUri);
       WebResponse responsePic = requestPic.GetResponse();
       
       Image webImage = Image.FromStream(responsePic.GetResponseStream());
   }
}

Reading Web Page As HTML

using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Text;
    public class Client
    {
        static public void Main(string[] Args)
        {
            HttpWebRequest webRequest =(HttpWebRequest)WebRequest.Create("http://www.google.ru/");
            HttpWebResponse webResponse = (HttpWebResponse)webRequest.GetResponse();
            StreamReader streamReader = new StreamReader(webResponse.GetResponseStream(), Encoding.ASCII);
            string outputString = streamReader.ReadToEnd();
            Console.WriteLine(outputString);
            streamReader.Close();
        }
    }

Save what you read from WebRequest to a file

using System.ruponentModel;
using System.IO;
using System.Net;
    class MainClass
    {
        static void Main()
        {
            WebRequest request = WebRequest.Create("http://nfex.ru");
            using (WebResponse response = request.GetResponse())
            using (Stream responseStream = response.GetResponseStream())
            using (FileStream output = File.Create("response.dat"))
            {
                Copy(responseStream, output);
            }
        }
        
        const int BufferSize = 8192;
        public static void Copy(Stream input,Stream output)
        {
            byte[] buffer = new byte[BufferSize];
            int read;
            while ((read = input.Read(buffer, 0, buffer.Length)) > 0)
            {
                output.Write(buffer, 0, read);
            }
        }
        public static byte[] ReadFully(Stream input)
        {
            using (MemoryStream tempStream = new MemoryStream())
            {
                Copy(input, tempStream);
                if (tempStream.Length == tempStream.GetBuffer().Length)
                {
                    return tempStream.GetBuffer();
                }
                return tempStream.ToArray();
            }
        }        
    }

Use WebRequest

using System;
using System.Net;
using System.IO;
class MainClass
{
  [STAThread]
  static void Main(string[] args)
  {
    WebRequest MyRequest = WebRequest.Create("http://www.nfex.ru");
    WebResponse MyResponse = MyRequest.GetResponse();
    Stream MyStream = MyResponse.GetResponseStream();
    StreamReader MyReader = new StreamReader(MyStream);
    string MyWebLine;
    while ((MyWebLine = MyReader.ReadLine()) != null)
    {
      Console.WriteLine(MyWebLine);
    }
    MyStream.Close();
  }
}

Use WebRequest and WebResponse to read a web page

using System;
using System.Net;
using System.IO;
public class MainClass {
   [STAThread]
   public static void Main(string[] args)
   {
       string htmlUri = "http://www.nfex.ru";
       WebRequest requestHtml = WebRequest.Create(htmlUri);       
       WebResponse responseHtml = requestHtml.GetResponse();
       // Read the text from the response stream.
       using (StreamReader r = new StreamReader(responseHtml.GetResponseStream()))
       {
           Console.WriteLine( r.ReadToEnd());
       }
   }
 
}
<HTML>
<HEAD>
     Java examples (example source code) Organized by topic </title>
...
...

Use WebRequest to create a StreamReader

using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.IO;
class MainClass
{
    static void Main(string[] args)
    {
        StreamReader reader = new StreamReader(WebRequest.Create("http://www.nfex.ru").GetResponse().GetResponseStream());
        string line;
        while ((line = reader.ReadLine()) != null)
        {
            Console.WriteLine(line);
        }
    }
}
<HTML>
<HEAD>
     Java examples (example source code) Organized by topic </title>
...
Источник — «http://nfex.ru/index.php?title=Csharp/CSharp_Tutorial/Network/WebRequest&oldid=6891»