http://www.cnblogs.com/sun8134/archive/2010/07/05/1771187.html

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！！?WebClient 類使用 WebRequest 類提供對 Internet 資源的訪問

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也是比較老的東西了

最近用到

記錄下以免以后忘了

要下載圖片首先要有圖片地址

要有圖片地址就要先把網頁下下來分析下URL

下載網頁一般用兩種方法

1，用?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,用?System.Net.HttpWebRequest

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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(); }

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至于怎么找圖片url略過，直接說下載圖片吧

其實和上面一樣，也有兩種方法：

1，WebRequest和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; //實際讀取的字節數 while ((c=reader.Read(buff, 0, buff.Length)) > 0) {writer.Write(buff, 0, c); } writer.Close(); writer.Dispose(); reader.Close(); reader.Dispose(); response.Close();

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2,WebClient

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

轉載于:https://www.cnblogs.com/carl2380/archive/2011/11/23/2260593.html

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