Windows 8 C# - retrieve a webpage source as string - c#

there's a tutorial that actually works for Windows 8 platform with XAML and C#: http://www.tech-recipes.com/rx/1954/get_web_page_contents_in_code_with_csharp/
Here's how:
HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(URL);
myRequest.Method = "GET";
WebResponse myResponse = myRequest.GetResponse();
StreamReader sr = new StreamReader(myResponse.GetResponseStream(), System.Text.Encoding.UTF8);
string result = sr.ReadToEnd();
sr.Close();
myResponse.Close();
However in Windows 8, the last 2 lines which are code to close the connection (I assume), detected error. It works fine without closing the connection, though, but what are the odds? Why do we have to close the connection? What could go wrong if I don't? What do "closing connection" even mean?


If you are developing for Windows 8, you should consider using asynchronous methods to provide for a better user experience and it is the recommend new standard. Your code would then look like:
public async Task<string> MakeWebRequest(string url)
{
HttpClient http = new System.Net.Http.HttpClient();
HttpResponseMessage response = await http.GetAsync(url);
return await response.Content.ReadAsStringAsync();
}


Maybe they've deprecated close() in the latest API. This should work:
HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(URL);
myRequest.Method = "GET";
using(WebResponse myResponse = myRequest.GetResponse() )
{
using(StreamReader sr = new StreamReader(myResponse.GetResponseStream(), System.Text.Encoding.UTF8))
{
string result = sr.ReadToEnd();
}
}
The using command will automatically dispose your objects.
To highlight webnoob's comment:
Just to point out (for OP reference) you can only use using on classes that implement IDisposable (which in this case is fine)


using System.Net;
using System.Net.Http;
var httpClient = new HttpClient();
var message = new HttpRequestMessage(HttpMethod.Get, targetURL);
//message.Headers.Add(....);
//message.Headers.Add(....);
var response = await httpClient.SendAsync(message);
if (response.StatusCode == HttpStatusCode.OK)
{
//HTTP 200 OK
var requestResultString = await response.Content.ReadAsStringAsync();
}


I would recommend using the HTTP Client
s. Microsoft HTTP Client Example

Related

How to use get_video_info Youtube

I'm trying to develop a Youtube downloader.I need video mp4 stream urls and im trying to use get_video info check my source code
WebRequest req = HttpWebRequest.Create("https://www.youtube.com/get_video_info?video_id=" + videoid +"&el=embedded&ps=default&eurl=&gl=US&hl=en");
WebResponse webResp = req.GetResponse();
StreamReader sr = new StreamReader(webResp.GetResponseStream(), System.Text.Encoding.UTF8);
string data = sr.ReadToEnd();
sr.Close();
webResp.Close();
This codes always get just a part of data maybe half.After decoding data just looks like this
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B6D35B87F6
You see its not full data I need from get_video_info.Its just a part of it.How can i solve this?

Use HttpClient it is much simpler than HttpWebRequest
using (var client = new HttpClient()) {
var response = await client.GetAsync(url);
string content = await response.Content.ReadAsStringAsync();
}
HttpClient is the best of both worlds (i.e. WebClient and HttpWebRequest)

How to Get Data From PHP C#

I have a Php Script in my Host Which has the link of my new version of my Program,How Can I Get that link From Php? I mean I wanna get that link From Php and Save it in one String.
I Often Use This Code For Doing Something like this:
webbrowser.Nagative("MyPhp Uri");
webbrowser.Document.ExecCommand("SelectAll", false, null);
webbrowser.Document.ExecCommand("Copy", false, null);
Than I Paste it in one Textbox
textbox1.Paste();
But This Way is not Complete way to get data From Php?
Can you help me?

You should use webrequest instead.
I'm not posting a complete solution because I'm pretty sure you will find one as soon as you know what to search for:
using System;
using System.Net;
//create a request object and server call
Uri requestUri = new Uri("MyPhp Uri");
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(this.requestUri);
//set all properties you need for the request, like
request.Method = "GET";
request.BeginGetResponse(new AsyncCallback(ProcessResponse), request);
//handle response
private void ProcessResponse(IAsyncResult asynchronousResult)
{
string responseData = string.Empty;
HttpWebRequest myrequest = (HttpWebRequest)asynchronousResult.AsyncState;
using (HttpWebResponse response = (HttpWebResponse)myrequest.EndGetResponse(asynchronousResult))
{
Stream responseStream = response.GetResponseStream();
using (var reader = new StreamReader(responseStream))
{
responseData = reader.ReadToEnd();
}
responseStream.Close();
}
//TODO: do something with your responseData
}
Please notice: you should definitively add some try/catch blocks.. this is only a short example to point you in the right direction.

GET : Getting an http response in C#

WebRequest req = WebRequest.Create("[URL here]");
WebResponse rep = req.GetResponse();
I wanted some insights into the relevance of the GetResponse method, it appears to deprecated now.
This other method I hacked together gets the job done.
HttpWebRequest request = (HttpWebRequest) WebRequest.Create(String.Format("http://mywebservicehere/dostuff?url=https://www.website.com"));
request.Method = "GET";
using (var response = (HttpWebResponse) (await Task<WebResponse>.Factory.FromAsync(request.BeginGetResponse, request.EndGetResponse, null)))
{
var encoding = ASCIIEncoding.ASCII;
StreamReader reader = new StreamReader(response.GetResponseStream(), encoding);
}
Wanted to know of any alternative methods others may have used? Thanks for the help!

I wanted some insights into the relevance of the GetResponse method,
it appears to deprecated now.
It is not deprecated, in the .NET for UWP, is is an async method.
WebRequest req = WebRequest.Create("[URL here]");
WebResponse rep = await req.GetResponseAsync();
Wanted to know of any alternative methods others may have used?
Besides the WebRequest class, there are another 2 HttpClient classes in the Windows Runtime Platform you can use to get a http response.
var client1 = new System.Net.Http.HttpClient();
var client2 = new Windows.Web.Http.HttpClient();
The System.Net.Http.HttpClient is in the .NET for UWP.
The Windows.Web.Http.HttpClient is in the Windows Runtime.

Async Get in ASP.net Web API does not close the connection when there is a GetResponseAsync in it

Here is my code :
public async Task<HttpResponseMessage> Get()
{
var url = "some url here";
string content;
HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
/*1*/ using (HttpWebResponse webresponse = await request.GetResponseAsync() as HttpWebResponse)
{
using (StreamReader reader = new StreamReader(webresponse.GetResponseStream()))
{
/*2*/ content = await reader.ReadToEndAsync();
}
}
var response = this.Request.CreateResponse(HttpStatusCode.OK);
response.Content = new StringContent(content, Encoding.UTF8, "text/plain");
return response;
}
and my problem:
When I try to visit this get in my IE, the connect is marked as pending all the time and nothing is shown. And in FireFox, I can read part of the data, and it is likely missing the last a few characters with the tab showing a spinning icon.
I guess it is because the HTTP connection is not closed by my IIS express( and with a few characters not flushed).
I tried to modify my code in line 1 and 2. The result is if I change line 1 into a synchronous call request.GetResponse() as HttpWebResponse, everything works fine as I expect, no mater what is in line 2, the ReadtoEnd(), async or sync .
I can use a workaround that only call request.GetResponse() to make everything works, but I want to know why this happens.

C# WebRequest won't work with this link from LinkShare

This is driving me a bit nuts. I am trying to do something quite simple, and I have done it many times before. Just trying to call a REST API.
I am trying to call GetMessage with endpoint = "http://feed.linksynergy.com/productsearch?token=717f8c8511725ea26fd5c3651f32ab187d8db9f4b208be781c292585400e682d&keyword=DVD", and it keeps returning empty string. If I pass it any other valid URL, it will work. But if I just copy and paste the original URL into the web browser, it returns fine!
Can any smart developer tell me what's going on?
Code below. Thanks in advance.
James
public string GetMessage(string endPoint)
{
HttpWebRequest request = CreateWebRequest(endPoint);
using (var response = (HttpWebResponse)request.GetResponse())
{
var responseValue = string.Empty;
if (response.StatusCode != HttpStatusCode.OK)
{
string message = String.Format("POST failed. Received HTTP {0}", response.StatusCode);
throw new ApplicationException(message);
}
// grab the response
using (var responseStream = response.GetResponseStream())
{
using (var reader = new StreamReader(responseStream))
{
responseValue = reader.ReadToEnd();
}
}
return responseValue;
}
}
private HttpWebRequest CreateWebRequest(string endPoint)
{
var request = (HttpWebRequest)WebRequest.Create(endPoint);
request.Method = "GET";
request.ContentLength = 0;
request.ContentType = "text/xml";
return request;
}

Not sure why your setting ContentLength/ContentType - that is generally for HTTP POST, where there is a request body for which you write data to via a stream.
This is a HTTP GET, so there is no request body. (just URI w/ query string)
This should work:
using System;
using System.IO;
using System.Net;
using System.Text;
// Create the web request
HttpWebRequest request = WebRequest.Create("http://www.someapi.com/") as HttpWebRequest;
// Get response
using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
{
// Get the response stream
StreamReader reader = new StreamReader(response.GetResponseStream());
// Console application output
Console.WriteLine(reader.ReadToEnd());
}
EDIT
#Gabe is also quite right - try this on another computer, that is isn't behind any kind of firewall/proxy server.
My work PC was behind a proxy server, so in order to make REST-based HTTP calls, i needed to do this:
var proxyObject = new System.Net.WebProxy("http://myDomain:8080/", true);
System.Net.WebRequest req = System.Net.WebRequest.Create("http://www.someapi.com/");
req.Proxy = proxyObject;
proxyObject.Credentials = New System.Net.NetworkCredential("domain\username","password")

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