[研究][ASP.NET] 讀網頁內容到字串

[研究][ASP.NET] 讀網頁內容到字串

2018-03-20

WebClient Constructor (System.Net) | Microsoft Docs
https://docs.microsoft.com/zh-tw/dotnet/api/system.net.webclient.-ctor?f1url=https%3A%2F%2Fmsdn.microsoft.com%2Fquery%2Fdev15.query%3FappId%3DDev15IDEF1%26l%3DZH-TW%26k%3Dk(System.Net.WebClient.%2523ctor);k(TargetFrameworkMoniker-.NETFramework,Version%3Dv4.6.2);k(DevLang-csharp)%26rd%3Dtrue&view=netframework-4.7.1

try { // Download the data to a buffer.       WebClient client = new WebClient(); Byte[] pageData = client.DownloadData("http://www.contoso.com"); string pageHtml = Encoding.ASCII.GetString(pageData); Console.WriteLine(pageHtml); // Download the data to a file.         client.DownloadFile("http://www.contoso.com", "page.htm"); // Upload some form post values. NameValueCollection form = new NameValueCollection(); form.Add("MyName", "MyValue"); Byte[] responseData = client.UploadValues("http://www.contoso.com/form.aspx", form);       }       catch (WebException webEx) {         Console.WriteLine(webEx.ToString());           if(webEx.Status == WebExceptionStatus.ConnectFailure) {           Console.WriteLine("Are you behind a firewall?  If so, go through the proxy server.");           }       }

string html = new WebClient().DownloadString("https://www.hinet.net/");

string html = await new WebClient().DownloadStringTaskAsync("https://www.hinet.net/");

using (WebClient wc = new WebClient()) {     string html = wc.DownloadString(address); }

WebRequest Class (System.Net) | Microsoft Docs
https://docs.microsoft.com/zh-tw/dotnet/api/system.net.webrequest?f1url=https%3A%2F%2Fmsdn.microsoft.com%2Fquery%2Fdev15.query%3FappId%3DDev15IDEF1%26l%3DZH-TW%26k%3Dk(System.Net.WebRequest);k(TargetFrameworkMoniker-.NETFramework,Version%3Dv4.6.2);k(DevLang-csharp)%26rd%3Dtrue&view=netframework-4.7.1

// Create a request for the URL.             WebRequest request = WebRequest.Create ("http://www.contoso.com/default.html");             // If required by the server, set the credentials.             request.Credentials = CredentialCache.DefaultCredentials;             // Get the response.             HttpWebResponse response = (HttpWebResponse)request.GetResponse ();             // Display the status.             Console.WriteLine (response.StatusDescription);             // Get the stream containing content returned by the server.             Stream dataStream = response.GetResponseStream ();             // Open the stream using a StreamReader for easy access.             StreamReader reader = new StreamReader (dataStream);             // Read the content.             string responseFromServer = reader.ReadToEnd ();             // Display the content.             Console.WriteLine (responseFromServer);             // Cleanup the streams and the response.             reader.Close ();             dataStream.Close ();             response.Close ();

var req = WebRequest.Create("https://www.hinet.net/"); req.BeginGetResponse(r => {     var response = req.EndGetResponse(r);     var stream = response.GetResponseStream();     var reader = new StreamReader(stream, true);     var str = reader.ReadToEnd();     Console.WriteLine(str); }, null);

(待續)

相關

HttpWebRequest Class (System.Net) | Microsoft Docs
https://docs.microsoft.com/zh-tw/dotnet/api/system.net.httpwebrequest?f1url=https%3A%2F%2Fmsdn.microsoft.com%2Fquery%2Fdev15.query%3FappId%3DDev15IDEF1%26l%3DZH-TW%26k%3Dk(System.Net.HttpWebRequest);k(TargetFrameworkMoniker-.NETFramework,Version%3Dv4.6.2);k(DevLang-csharp)%26rd%3Dtrue&view=netframework-4.7.1