C # download Web images

It's old stuff, too.

Recently used

Write it down so you don't forget it later.

To download a picture, first you have a picture address

To have a picture address, you must first put down the page to analyze the URL

Download Web page generally in two ways

1, with System.Net.WebClient

Using system.net;using system.windows.forms;string url = "http://www.cnblogs.com"; string result = Null;try{    WebClient client = new WebClient ();    result = client. downloadstring (URL);} catch (Exception ex) {    MessageBox.Show (ex. Message);}

2, with System.Net.HttpWebRequest

Using system.net;using system.io;using system.windows.forms;string result = null;string url = "Http://www.cnblogs.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) {    MessageBox.Show (ex. Message);} finally{    if (reader! = null)        reader. Close ();    if (response! = NULL)        response. Close ();}

As for how to find the image URL skip, just say download Picture it

In fact, the same as above, there are two ways:

1,webrequest and WebResponse

WebRequest request = WebRequest.Create ("Http://images.cnblogs.com/logo_small.gif"); WebResponse response = Request. GetResponse (); Stream reader = response. GetResponseStream (); FileStream writer = new FileStream ("X:\\pic.jpg", FileMode.OpenOrCreate, FileAccess.Write); byte[] buff = new byte[512]; int c = 0; The number of bytes actually read while (C=reader. Read (buff, 0, buff. Length)) > 0) {    writer. Write (buff, 0, c);} Writer. Close (); writer. Dispose (); reader. Close (); reader. Dispose (); response. Close ();

2,webclient

String url = "Http://images.cnblogs.com/logo_small.gif"; string filepath = "X:\\pic.jpg"; WebClient mywebclient = new WebClient (); mywebclient. DownloadFile (URL, filepath);

C # download Web images