Csharp/CSharp Tutorial/Network/WebClient
Содержание
- 1 Download Data
- 2 Download File
- 3 Download HTM files
- 4 Download string from a website using the WebClient
- 5 Open/Read Test
- 6 Open/Write Test
- 7 Response Headers
- 8 Set download string for WebClient
- 9 Upload Data
- 10 Upload Values
- 11 Use WebClient to download information into a file
- 12 Use WebClient to read website
- 13 Web login
Download Data
<source lang="csharp">using System; using System.Net; using System.Text; class MainClass {
public static void Main(string[] argv)
{
WebClient wc = new WebClient();
byte[] response = wc.DownloadData("http://www.nfex.ru");
Console.WriteLine(Encoding.ASCII.GetString(response));
}
}</source>
Download File
<source lang="csharp">using System; using System.Net; class MainClass {
public static void Main(string[] argv)
{
WebClient wc = new WebClient();
string filename = "index.html";
wc.DownloadFile("http://www.nfex.ru", filename);
Console.WriteLine("file downloaded");
}
}</source>
Download HTM files
<source lang="csharp">using System; using System.IO; using System.Net; using System.Text.RegularExpressions; class MainClass {
private static void Main()
{
string remoteUri = "http://www.nfex.ru";
WebClient client = new WebClient();
string str = client.DownloadString(remoteUri);
MatchCollection matches = Regex.Matches(str,@"http\S+[^-,;:?]\.htm");
foreach(Match match in matches)
{
foreach(Group grp in match.Groups)
{
string file = grp.Value.Substring(grp.Value.LastIndexOf("/")+1);
try
{
Console.WriteLine("Downloading {0} to file {1}",
grp.Value, file);
//client.DownloadFile(new Uri(grp.Value), file);
}
catch
{
Console.WriteLine("Failed to download {0}", grp.Value);
}
}
}
}
}</source>
Downloading http://www.nfex.ru/Code/Java/CatalogJava.htm to file CatalogJava.htm Downloading http://www.nfex.ru/Tutorial/Java/CatalogJava.htm to file CatalogJava.htm Downloading http://www.nfex.ru/Article/Java/CatalogJava.htm to file CatalogJava.htm Downloading http://www.nfex.ru/Product/Java/CatalogJava.htm to file CatalogJava.htm
Download string from a website using the WebClient
<source lang="csharp">using System; using System.IO; using System.Net; using System.Text.RegularExpressions; class MainClass {
private static void Main()
{
string remoteUri = "http://www.nfex.ru";
WebClient client = new WebClient();
Console.WriteLine("Downloading {0}", remoteUri);
string str = client.DownloadString(remoteUri);
Console.WriteLine(str);
}
}</source>
Downloading http://www.nfex.ru
<HTML>
<HEAD>
Java examples (example source code) Organized by topic </title>
...
...
Open/Read Test
<source lang="csharp">using System; using System.IO; using System.Net; class MainClass {
public static void Main(string[] argv)
{
WebClient wc = new WebClient();
string response;
Stream strm = wc.OpenRead("http://www.nfex.ru");
StreamReader sr = new StreamReader(strm);
while(sr.Peek() > -1)
{
response = sr.ReadLine();
Console.WriteLine(response);
}
sr.Close();
}
}</source>
Open/Write Test
<source lang="csharp">using System; using System.IO; using System.Net; class MainClass {
public static void Main(string[] argv)
{
WebClient wc = new WebClient();
string data = "Data up upload to server";
Stream strm = wc.OpenWrite("http://www.nfex.ru");
StreamWriter sw = new StreamWriter(strm);
sw.WriteLine(data);
sw.Close();
strm.Close();
}
}</source>
Response Headers
<source lang="csharp">using System; using System.Collections.Specialized; using System.Net; class MainClass {
public static void Main(string[] argv)
{
WebClient wc = new WebClient();
byte[] response = wc.DownloadData("http://www.jva2s.ru");
WebHeaderCollection whc = wc.ResponseHeaders;
Console.WriteLine("header count = {0}", whc.Count);
for (int i = 0; i < whc.Count; i++)
{
Console.WriteLine(whc.GetKey(i) + " = " + whc.Get(i));
}
}
}</source>
Set download string for WebClient
<source lang="csharp">using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Net;
class Program
{
static void Main()
{
WebClient client = new WebClient();
client.BaseAddress = "http://www.microsoft.ru";
string data = client.DownloadString("Office");
Console.WriteLine(data);
}
}</source>
Upload Data
<source lang="csharp">using System; using System.Net; using System.Text; class MainClass {
public static void Main(string[] argv)
{
WebClient wc = new WebClient();
string data = "This is the data to post";
byte[] dataarray = Encoding.ASCII.GetBytes(data);
wc.UploadData("youraddress", dataarray);
}
}</source>
Upload Values
<source lang="csharp">using System; using System.Collections.Specialized; using System.Net; using System.Text; class MainClass {
public static void Main(string[] argv)
{
WebClient wc = new WebClient();
string uri = "http://localhost/testform.aspx";
NameValueCollection nvc = new NameValueCollection();
nvc.Add("lastname", "B");
nvc.Add("firstname", "A");
byte[] response = wc.UploadValues(uri, nvc);
Console.WriteLine(Encoding.ASCII.GetString(response));
}
}</source>
Use WebClient to download information into a file
<source lang="csharp">using System; using System.Net; using System.IO;
class MainClass {
public static void Main() {
WebClient user = new WebClient();
string uri = "http://www.nfex.ru";
string fname = "data.txt";
try {
Console.WriteLine("Downloading data from " + uri + " to " + fname);
user.DownloadFile(uri, fname);
} catch (WebException exc) {
Console.WriteLine(exc);
}
Console.WriteLine("Download complete.");
}
}</source>
Downloading data from http://www.nfex.ru to data.txt Download complete.
Use WebClient to read website
<source lang="csharp">using System; using System.Net; using System.Text; using System.IO; class MainClass {
[STAThread]
static void Main(string[] args)
{
WebClient MyClient = new WebClient();
Stream MyStream = MyClient.OpenRead("http://www.nfex.ru");
StreamReader MyReader = new StreamReader(MyStream);
Console.WriteLine(MyReader.ReadLine());
MyStream.Close();
}
}</source>
Web login
<source lang="csharp">using System; using System.Net; using System.Text; class MainClass {
public static void Main()
{
WebClient wc = new WebClient();
NetworkCredential nc = new NetworkCredential("usr", "mypassword");
wc.Credentials = nc;
byte[] response = wc.DownloadData("http://localhost/testlogin");
Console.WriteLine(Encoding.ASCII.GetString(response));
}
}</source>
